ACT Test result is far lower than offical webside about act

[bayoukingpin]

This could be for a few reasons. Your ACT config file looks good for a 3x test, but we have seen the 840 pro pass only at 2x.

You should check the following:

1. Did you overprovision the drives to 21%? This is essential in getting decent performance.
2. Is the SSD attached using a RAID controller? This can affect the tests. If it is, please tell us the model and we can look into how to improve performance.
3. Make sure the drives use AHCI and NCQ. These are more rare today, but we have seen them affect ACT test results.

Young Paik
Director, Sales Engineering
Aerospike, Inc.
2525 Charleston Road
Mountain View, CA 94043
Tel: [phone]
www.aerospike.com
[email protected]

On Apr 13, 2014, at 20:10, FinnHuang [email protected] wrote:

My Samsung 840 Pro 256GB SSD ACT Test result is far lower than offical webside.
Is it config file issue?

My config file:

mandatory non-zero, ignored if queue-per-device is yes:

num-queues: 8

mandatory non-zero:

threads-per-queue: 8
test-duration-sec: 86400
report-interval-sec: 1
read-reqs-per-sec: 6000
large-block-ops-per-sec: 71
read-req-num-512-blocks: 3
large-block-op-kbytes: 128

My test system:
CPU: i7-4770, RAM:DDR3 16GB

Test rsult: > 1 ms (% total / ssd only) = 28.5 / 27.75

—
Reply to this email directly or view it on GitHub.

[FinnHuang]

Hi Young,

Great thanks for your prompt response.

1. How do we overprovision the drive? Isn’t it control by SSD firmware?
2. We currently not using RAID controller, is the test result in website were using RAID mode?

Best Regards
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Monday, April 14, 2014 2:05 PM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

This could be for a few reasons. Your ACT config file looks good for a 3x test, but we have seen the 840 pro pass only at 2x.

You should check the following:

1. Did you overprovision the drives to 21%? This is essential in getting decent performance.
2. Is the SSD attached using a RAID controller? This can affect the tests. If it is, please tell us the model and we can look into how to improve performance.
3. Make sure the drives use AHCI and NCQ. These are more rare today, but we have seen them affect ACT test results.

Young Paik
Director, Sales Engineering
Aerospike, Inc.
2525 Charleston Road
Mountain View, CA 94043
Tel: [phone]
www.aerospike.comhttp://www.aerospike.com
[email protected]:[email protected]

On Apr 13, 2014, at 20:10, FinnHuang <[email protected]mailto:[email protected]> wrote:

My Samsung 840 Pro 256GB SSD ACT Test result is far lower than offical webside.
Is it config file issue?

My config file:

mandatory non-zero, ignored if queue-per-device is yes:

num-queues: 8

mandatory non-zero:

threads-per-queue: 8
test-duration-sec: 86400
report-interval-sec: 1
read-reqs-per-sec: 6000
large-block-ops-per-sec: 71
read-req-num-512-blocks: 3
large-block-op-kbytes: 128

My test system:
CPU: i7-4770, RAM:DDR3 16GB

Test rsult: > 1 ms (% total / ssd only) = 28.5 / 27.75

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40335512.

[bbulkow]

Fin, thanks for looking at our benchmark.

Over provisioning is not controlled by the drive. Provisioning is controlled by the drive, where they set aside a certain amount of flash hardware for writing. The Samsung 843T is known to provision very little extra space (7%) compared to other enterprise drives' 20% and higher. Samsung believes this is the best policy, as different use patterns require different provisioning - their drive should be the minimum, with other use cases solved by over provisioning.

Besides the mechanisms described in the readme (hdparam), you can also simply use less storage- the physical drive will simply optimize. Creating a partition that uses less of the drive has the same basic effect as over-provisioning. Some of our testing shows the hdparam route provides better performance, but simply using a smaller partition should be equivalent. We have ongoing testing on that.

[bayoukingpin]

Finn,

As Brian mentioned there are 2 different ways to overprovision drives. Here is a link to our Web site that documents the methods. The more common method is to use hdparm to set the HPA.

https://docs.aerospike.com/display/V3/SSD+Setup+-+not+using+RAID

Please let us know if you are having any issues with this.

Young

Young Paik
Director, Sales Engineering

m [phone]

      
Stay in touch, signup for our newsletter.

From: Brian Bulkowski [email protected]
Reply: aerospike/act [email protected]
Date: April 13, 2014 at 11:54:17 PM
To: aerospike/act [email protected]
Cc: bayoukingpin [email protected]
Subject:  Re: [act] ACT Test result is far lower than offical webside (#18)

Fin, thanks for looking at our benchmark.

Over provisioning is not controlled by the drive. Provisioning is controlled by the drive, where they set aside a certain amount of flash hardware for writing. The Samsung 843T is known to provision very little extra space (7%) compared to other enterprise drives' 20% and higher. Samsung believes this is the best policy, as different use patterns require different provisioning - their drive should be the minimum, with other use cases solved by over provisioning.

Besides the mechanisms described in the readme (hdparam), you can also simply use less storage- the physical drive will simply optimize. Creating a partition that uses less of the drive has the same basic effect as over-provisioning. Some of our testing shows the hdparam route provides better performance, but simply using a smaller partition should be equivalent. We have ongoing testing on that.

—
Reply to this email directly or view it on GitHub.

[FinnHuang]

Hi Young,

Thank you and Brian for the input.
We have follow the instruction to over-provisioning our 840 PRO 256GB SSD as the following steps:

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

hdparm -Np400094553 --yes-i-know-what-i-am-doing /dev/sdb

reboot

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

However, it returns “HPA is disabled” after we restart the machine.

Is there anything need to be done?

Thank you
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Tuesday, April 15, 2014 12:19 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

As Brian mentioned there are 2 different ways to overprovision drives. Here is a link to our Web site that documents the methods. The more common method is to use hdparm to set the HPA.

https://docs.aerospike.com/display/V3/SSD+Setup+-+not+using+RAID

Please let us know if you are having any issues with this.

Young

Young Paik
Director, Sales Engineering

m [phone]

Stay in touch, signup for our newsletter.

From: Brian Bulkowski [email protected]
Reply: aerospike/act [email protected]
Date: April 13, 2014 at 11:54:17 PM
To: aerospike/act [email protected]
Cc: bayoukingpin [email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Fin, thanks for looking at our benchmark.

Over provisioning is not controlled by the drive. Provisioning is controlled by the drive, where they set aside a certain amount of flash hardware for writing. The Samsung 843T is known to provision very little extra space (7%) compared to other enterprise drives' 20% and higher. Samsung believes this is the best policy, as different use patterns require different provisioning - their drive should be the minimum, with other use cases solved by over provisioning.

Besides the mechanisms described in the readme (hdparam), you can also simply use less storage- the physical drive will simply optimize. Creating a partition that uses less of the drive has the same basic effect as over-provisioning. Some of our testing shows the hdparam route provides better performance, but simply using a smaller partition should be equivalent. We have ongoing testing on that.

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40386153.

[FinnHuang]

Hi Young,

We successes on over-provisioning now (Seem to be Z87 compatibility issue)

One more question, is website result is also using the following write-buffers setting?

if 0, will write all zeros every time:

num-write-buffers: 256

Thank you
Finn

From: Finn Huang(黃振榮)
Sent: Tuesday, April 15, 2014 3:36 PM
To: 'aerospike/act'; aerospike/act
Subject: RE: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

Thank you and Brian for the input.
We have follow the instruction to over-provisioning our 840 PRO 256GB SSD as the following steps:

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

hdparm -Np400094553 --yes-i-know-what-i-am-doing /dev/sdb

reboot

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

However, it returns “HPA is disabled” after we restart the machine.

Is there anything need to be done?

Thank you
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Tuesday, April 15, 2014 12:19 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

As Brian mentioned there are 2 different ways to overprovision drives. Here is a link to our Web site that documents the methods. The more common method is to use hdparm to set the HPA.

https://docs.aerospike.com/display/V3/SSD+Setup+-+not+using+RAID

Please let us know if you are having any issues with this.

Young

Young Paik
Director, Sales Engineering

m [phone]

Stay in touch, signup for our newsletter.

From: Brian Bulkowski [email protected]:[email protected]
Reply: aerospike/act [email protected]:[email protected]
Date: April 13, 2014 at 11:54:17 PM
To: aerospike/act [email protected]:[email protected]
Cc: bayoukingpin [email protected]:[email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Fin, thanks for looking at our benchmark.

Over provisioning is not controlled by the drive. Provisioning is controlled by the drive, where they set aside a certain amount of flash hardware for writing. The Samsung 843T is known to provision very little extra space (7%) compared to other enterprise drives' 20% and higher. Samsung believes this is the best policy, as different use patterns require different provisioning - their drive should be the minimum, with other use cases solved by over provisioning.

Besides the mechanisms described in the readme (hdparam), you can also simply use less storage- the physical drive will simply optimize. Creating a partition that uses less of the drive has the same basic effect as over-provisioning. Some of our testing shows the hdparam route provides better performance, but simply using a smaller partition should be equivalent. We have ongoing testing on that.

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40386153.

[bayoukingpin]

Finn,

The instructions you have look good to me. There are 2 things to check:
I assume you have done this, but you were root when you ran this? You can also use sudo if the user has appropriate privileges.
Can you run “hdpam -version”. The older versions may not work properly. We are using the latest release 9.43.

Young

Young Paik
Director, Sales Engineering

m [phone]

      
Stay in touch, signup for our newsletter.

From: FinnHuang [email protected]
Reply: aerospike/act [email protected]
Date: April 15, 2014 at 12:36:09 AM
To: aerospike/act [email protected]
Cc: bayoukingpin [email protected]
Subject:  Re: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

Thank you and Brian for the input.
We have follow the instruction to over-provisioning our 840 PRO 256GB SSD as the following steps:

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

hdparm -Np400094553 --yes-i-know-what-i-am-doing /dev/sdb

reboot

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

However, it returns “HPA is disabled” after we restart the machine.

Is there anything need to be done?

Thank you
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Tuesday, April 15, 2014 12:19 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

As Brian mentioned there are 2 different ways to overprovision drives. Here is a link to our Web site that documents the methods. The more common method is to use hdparm to set the HPA.

https://docs.aerospike.com/display/V3/SSD+Setup+-+not+using+RAID

Please let us know if you are having any issues with this.

Young

Young Paik
Director, Sales Engineering

m [phone]

Stay in touch, signup for our newsletter.

From: Brian Bulkowski [email protected]
Reply: aerospike/act [email protected]
Date: April 13, 2014 at 11:54:17 PM
To: aerospike/act [email protected]
Cc: bayoukingpin [email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Fin, thanks for looking at our benchmark.

Over provisioning is not controlled by the drive. Provisioning is controlled by the drive, where they set aside a certain amount of flash hardware for writing. The Samsung 843T is known to provision very little extra space (7%) compared to other enterprise drives' 20% and higher. Samsung believes this is the best policy, as different use patterns require different provisioning - their drive should be the minimum, with other use cases solved by over provisioning.

Besides the mechanisms described in the readme (hdparam), you can also simply use less storage- the physical drive will simply optimize. Creating a partition that uses less of the drive has the same basic effect as over-provisioning. Some of our testing shows the hdparam route provides better performance, but simply using a smaller partition should be equivalent. We have ongoing testing on that.

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40386153.
—
Reply to this email directly or view it on GitHub.

[bayoukingpin]

Finn,

Glad it is working. Yes, the results we take always have the number of write buffers set at 256.

Young

Young Paik
Director, Sales Engineering

m [phone]

      
Stay in touch, signup for our newsletter.

From: FinnHuang [email protected]
Reply: aerospike/act [email protected]
Date: April 15, 2014 at 3:52:29 AM
To: aerospike/act [email protected]
Cc: bayoukingpin [email protected]
Subject:  Re: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

We successes on over-provisioning now (Seem to be Z87 compatibility issue)

One more question, is website result is also using the following write-buffers setting?

if 0, will write all zeros every time:

num-write-buffers: 256

Thank you
Finn

From: Finn Huang(黃振榮)
Sent: Tuesday, April 15, 2014 3:36 PM
To: 'aerospike/act'; aerospike/act
Subject: RE: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

Thank you and Brian for the input.
We have follow the instruction to over-provisioning our 840 PRO 256GB SSD as the following steps:

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

hdparm -Np400094553 --yes-i-know-what-i-am-doing /dev/sdb

reboot

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

However, it returns “HPA is disabled” after we restart the machine.

Is there anything need to be done?

Thank you
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Tuesday, April 15, 2014 12:19 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

As Brian mentioned there are 2 different ways to overprovision drives. Here is a link to our Web site that documents the methods. The more common method is to use hdparm to set the HPA.

https://docs.aerospike.com/display/V3/SSD+Setup+-+not+using+RAID

Please let us know if you are having any issues with this.

Young

Young Paik
Director, Sales Engineering

m [phone]

Stay in touch, signup for our newsletter.

From: Brian Bulkowski [email protected]:[email protected]
Reply: aerospike/act [email protected]:[email protected]
Date: April 13, 2014 at 11:54:17 PM
To: aerospike/act [email protected]:[email protected]
Cc: bayoukingpin [email protected]:[email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Fin, thanks for looking at our benchmark.

Over provisioning is not controlled by the drive. Provisioning is controlled by the drive, where they set aside a certain amount of flash hardware for writing. The Samsung 843T is known to provision very little extra space (7%) compared to other enterprise drives' 20% and higher. Samsung believes this is the best policy, as different use patterns require different provisioning - their drive should be the minimum, with other use cases solved by over provisioning.

Besides the mechanisms described in the readme (hdparam), you can also simply use less storage- the physical drive will simply optimize. Creating a partition that uses less of the drive has the same basic effect as over-provisioning. Some of our testing shows the hdparam route provides better performance, but simply using a smaller partition should be equivalent. We have ongoing testing on that.

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40386153.
—
Reply to this email directly or view it on GitHub.

[FinnHuang]

Hi Young,

We are evaluating some SSD under single drive and JBOD mode with over-provisioning.
We have successfully set SSD over-provisioning, but sometimes it turned to “HPA is disabled” after testing.
Our over-provisioning setting seems not stable, is it normal? We wonder if this is system problem or SSD problem?

Thank you
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Wednesday, April 16, 2014 4:06 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

Glad it is working. Yes, the results we take always have the number of write buffers set at 256.

Young

Young Paik
Director, Sales Engineering

m [phone]

Stay in touch, signup for our newsletter.

From: FinnHuang [email protected]
Reply: aerospike/act [email protected]
Date: April 15, 2014 at 3:52:29 AM
To: aerospike/act [email protected]
Cc: bayoukingpin [email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

We successes on over-provisioning now (Seem to be Z87 compatibility issue)

One more question, is website result is also using the following write-buffers setting?

if 0, will write all zeros every time:

num-write-buffers: 256

Thank you
Finn

From: Finn Huang(黃振榮)
Sent: Tuesday, April 15, 2014 3:36 PM
To: 'aerospike/act'; aerospike/act
Subject: RE: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

Thank you and Brian for the input.
We have follow the instruction to over-provisioning our 840 PRO 256GB SSD as the following steps:

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

hdparm -Np400094553 --yes-i-know-what-i-am-doing /dev/sdb

reboot

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

However, it returns “HPA is disabled” after we restart the machine.

Is there anything need to be done?

Thank you
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Tuesday, April 15, 2014 12:19 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

As Brian mentioned there are 2 different ways to overprovision drives. Here is a link to our Web site that documents the methods. The more common method is to use hdparm to set the HPA.

https://docs.aerospike.com/display/V3/SSD+Setup+-+not+using+RAID

Please let us know if you are having any issues with this.

Young

Young Paik
Director, Sales Engineering

m [phone]

Stay in touch, signup for our newsletter.

From: Brian Bulkowski [email protected]:[email protected]
Reply: aerospike/act [email protected]:[email protected]
Date: April 13, 2014 at 11:54:17 PM
To: aerospike/act [email protected]:[email protected]
Cc: bayoukingpin [email protected]:[email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Fin, thanks for looking at our benchmark.

Over provisioning is not controlled by the drive. Provisioning is controlled by the drive, where they set aside a certain amount of flash hardware for writing. The Samsung 843T is known to provision very little extra space (7%) compared to other enterprise drives' 20% and higher. Samsung believes this is the best policy, as different use patterns require different provisioning - their drive should be the minimum, with other use cases solved by over provisioning.

Besides the mechanisms described in the readme (hdparam), you can also simply use less storage- the physical drive will simply optimize. Creating a partition that uses less of the drive has the same basic effect as over-provisioning. Some of our testing shows the hdparam route provides better performance, but simply using a smaller partition should be equivalent. We have ongoing testing on that.

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40386153.
—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40527592.

[bayoukingpin]

Finn,

This is not at all normal. You should be able to set HPA and even move the disk with the changes persisted. Can you share with us:
What version of hdparm are you using? The current is 9.43. Versions older than 9.37 definitely had problems with SSDs.
What controller are you using? Sometimes the controller is the reason there are problems using HPA.
We have done this with the Samsung 840 Pro in the past without any issues. 

Young

Young Paik
Technical Marketing Director

m [phone]

      
Stay in touch, signup for our newsletter.

From: FinnHuang [email protected]
Reply: aerospike/act [email protected]
Date: May 1, 2014 at 11:19:10 PM
To: aerospike/act [email protected]
Cc: Young Paik [email protected]
Subject:  Re: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

We are evaluating some SSD under single drive and JBOD mode with over-provisioning.
We have successfully set SSD over-provisioning, but sometimes it turned to “HPA is disabled” after testing.
Our over-provisioning setting seems not stable, is it normal? We wonder if this is system problem or SSD problem?

Thank you
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Wednesday, April 16, 2014 4:06 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

Glad it is working. Yes, the results we take always have the number of write buffers set at 256.

Young

Young Paik
Director, Sales Engineering

m [phone]

Stay in touch, signup for our newsletter.

From: FinnHuang [email protected]
Reply: aerospike/act [email protected]
Date: April 15, 2014 at 3:52:29 AM
To: aerospike/act [email protected]
Cc: bayoukingpin [email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

We successes on over-provisioning now (Seem to be Z87 compatibility issue)

One more question, is website result is also using the following write-buffers setting?

if 0, will write all zeros every time:

num-write-buffers: 256

Thank you
Finn

From: Finn Huang(黃振榮)
Sent: Tuesday, April 15, 2014 3:36 PM
To: 'aerospike/act'; aerospike/act
Subject: RE: [act] ACT Test result is far lower than offical webside (#18)

Hi Young,

Thank you and Brian for the input.
We have follow the instruction to over-provisioning our 840 PRO 256GB SSD as the following steps:

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

hdparm -Np400094553 --yes-i-know-what-i-am-doing /dev/sdb

reboot

hdparm -N /dev/sdb
/dev/sdb:
max sectors = 500118192/500118192, HPA is disabled

However, it returns “HPA is disabled” after we restart the machine.

Is there anything need to be done?

Thank you
Finn

From: bayoukingpin [mailto:[email protected]]
Sent: Tuesday, April 15, 2014 12:19 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

As Brian mentioned there are 2 different ways to overprovision drives. Here is a link to our Web site that documents the methods. The more common method is to use hdparm to set the HPA.

https://docs.aerospike.com/display/V3/SSD+Setup+-+not+using+RAID

Please let us know if you are having any issues with this.

Young

Young Paik
Director, Sales Engineering

m [phone]

Stay in touch, signup for our newsletter.

From: Brian Bulkowski [email protected]:[email protected]
Reply: aerospike/act [email protected]:[email protected]
Date: April 13, 2014 at 11:54:17 PM
To: aerospike/act [email protected]:[email protected]
Cc: bayoukingpin [email protected]:[email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Fin, thanks for looking at our benchmark.

Over provisioning is not controlled by the drive. Provisioning is controlled by the drive, where they set aside a certain amount of flash hardware for writing. The Samsung 843T is known to provision very little extra space (7%) compared to other enterprise drives' 20% and higher. Samsung believes this is the best policy, as different use patterns require different provisioning - their drive should be the minimum, with other use cases solved by over provisioning.

Besides the mechanisms described in the readme (hdparam), you can also simply use less storage- the physical drive will simply optimize. Creating a partition that uses less of the drive has the same basic effect as over-provisioning. Some of our testing shows the hdparam route provides better performance, but simply using a smaller partition should be equivalent. We have ongoing testing on that.

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40386153.
—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-40527592.
—
Reply to this email directly or view it on GitHub.

[FinnHuang]

Dear Young,

We have a strange problem of Over-provisioning on OCZ 3600 SSD.
After Over-provisioning the OCZ 3600 SSD, we are unable to disable Over-provisioning on it.

It shows as below:
/dev/sdb:
Max_sectors = 625138214/ 625138214, HPA is enabled

We have try to HDD secure erase and Linux secure erase this SSD, but OCZ 3600 SSD is unable to recover to default.
Have you encounter this situation before? Is there any suggestion to do?

Thank you
Finn

[bayoukingpin]

Finn,

You may need to contact OCZ to find out how to do it. We have tested and found the OCZs operate differently from all the other manufacturers. It could be that you need to put in the full number of sectors, which would be a pain.

Secure erase does not work and rarely seems to do anything to over-provisioning. I would have thought that it would return the drive to original specs, but that never seems to happen.

Young

Young Paik
Technical Marketing Director

m [phone]

      
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From: FinnHuang [email protected]
Reply: aerospike/act [email protected]
Date: May 11, 2014 at 10:56:58 PM
To: aerospike/act [email protected]
Cc: Young Paik [email protected]
Subject:  Re: [act] ACT Test result is far lower than offical webside (#18)

Dear Young,

We have a strange problem of Over-provisioning on OCZ 3600 SSD.
After Over-provisioning the OCZ 3600 SSD, we are unable to disable Over-provisioning on it.

It shows as below:
/dev/sdb:
Max_sectors = 625138214/ 625138214, HPA is enabled

We have try to HDD secure erase and Linux secure erase this SSD, but OCZ 3600 SSD is unable to recover to default.
Have you encounter this situation before? Is there any suggestion to do?

Thank you
Finn

—
Reply to this email directly or view it on GitHub.

[FinnHuang]

Hi Young,

Many thanks for your input.
We will contact OCZ for this issue.

Best Regards
Finn

From: Young Paik [mailto:[email protected]]
Sent: Tuesday, May 13, 2014 4:26 AM
To: aerospike/act
Cc: Finn Huang(黃振榮)
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Finn,

You may need to contact OCZ to find out how to do it. We have tested and found the OCZs operate differently from all the other manufacturers. It could be that you need to put in the full number of sectors, which would be a pain.

Secure erase does not work and rarely seems to do anything to over-provisioning. I would have thought that it would return the drive to original specs, but that never seems to happen.

Young

Young Paik
Technical Marketing Director

m [phone]

Stay in touch, signup for our newsletter.

From: FinnHuang [email protected]
Reply: aerospike/act [email protected]
Date: May 11, 2014 at 10:56:58 PM
To: aerospike/act [email protected]
Cc: Young Paik [email protected]
Subject: Re: [act] ACT Test result is far lower than offical webside (#18)

Dear Young,

We have a strange problem of Over-provisioning on OCZ 3600 SSD.
After Over-provisioning the OCZ 3600 SSD, we are unable to disable Over-provisioning on it.

It shows as below:
/dev/sdb:
Max_sectors = 625138214/ 625138214, HPA is enabled

We have try to HDD secure erase and Linux secure erase this SSD, but OCZ 3600 SSD is unable to recover to default.
Have you encounter this situation before? Is there any suggestion to do?

Thank you
Finn

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-42883519.