Iometer on Linux having issues with SSD and large filesize

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Iometer on Linux having issues with SSD and large filesize

WRIGHT Alan [UK]

Doing some tests on Random access to SSD’s I am finding that with large filesize 2GB or greater, SSD performance with Iometer is very poor.

 

With an HP P410i controller and 4 SSD’s in RAID10, I am managing 110K IOPS and 910MB/s with a 1GB iobw.tst filesize and this is stable.

 

If I grow the file to 2GB or greater, then performance is very poor ~30MB/s, all I have done is change the iobw.tst filesize (all other parameters the same)

 

The device under test is an HP DL360G6 with CentOS6.3 64bit

 

I have attempted the same test case with 1GB file and 10GB file on my laptop (Windows7 64bit), for both cases, I get the same performance and stable at around 18KIOPS and 160MB/s. I would therefore discount the theory that the disk controllers have issues with filesizes.

 

Any ideas?


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Re: Iometer on Linux having issues with SSD and large filesize

Neto, Antonio Jose Rodrigues

Hi Alan,

 

This is neto from Brazil

 

How are  you?

 

Please try to use the latest SVN version with O_DIRECT support on Linux and libaio.

 

Please let me know if you need any help

 

All the best

 

neto

 

From: WRIGHT Alan [UK] [mailto:[hidden email]]
Sent: Tuesday, August 28, 2012 9:34 AM
To: [hidden email]
Subject: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Doing some tests on Random access to SSD’s I am finding that with large filesize 2GB or greater, SSD performance with Iometer is very poor.

 

With an HP P410i controller and 4 SSD’s in RAID10, I am managing 110K IOPS and 910MB/s with a 1GB iobw.tst filesize and this is stable.

 

If I grow the file to 2GB or greater, then performance is very poor ~30MB/s, all I have done is change the iobw.tst filesize (all other parameters the same)

 

The device under test is an HP DL360G6 with CentOS6.3 64bit

 

I have attempted the same test case with 1GB file and 10GB file on my laptop (Windows7 64bit), for both cases, I get the same performance and stable at around 18KIOPS and 160MB/s. I would therefore discount the theory that the disk controllers have issues with filesizes.

 

Any ideas?


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threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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Re: Iometer on Linux having issues with SSD and large filesize

WRIGHT Alan [UK]

Hi Antonio,

I tried latest from SVN, and compiled for CentOS 6.3, but its worse, even 1GB file with @latest is poor.

 

L

 

Alan

 

From: Neto, Antonio Jose Rodrigues [mailto:[hidden email]]
Sent: 28 August 2012 14:52
To: WRIGHT Alan [UK]; [hidden email]
Subject: RE: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Hi Alan,

 

This is neto from Brazil

 

How are  you?

 

Please try to use the latest SVN version with O_DIRECT support on Linux and libaio.

 

Please let me know if you need any help

 

All the best

 

neto

 

From: WRIGHT Alan [UK] [hidden email]
Sent: Tuesday, August 28, 2012 9:34 AM
To: [hidden email]
Subject: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Doing some tests on Random access to SSD’s I am finding that with large filesize 2GB or greater, SSD performance with Iometer is very poor.

 

With an HP P410i controller and 4 SSD’s in RAID10, I am managing 110K IOPS and 910MB/s with a 1GB iobw.tst filesize and this is stable.

 

If I grow the file to 2GB or greater, then performance is very poor ~30MB/s, all I have done is change the iobw.tst filesize (all other parameters the same)

 

The device under test is an HP DL360G6 with CentOS6.3 64bit

 

I have attempted the same test case with 1GB file and 10GB file on my laptop (Windows7 64bit), for both cases, I get the same performance and stable at around 18KIOPS and 160MB/s. I would therefore discount the theory that the disk controllers have issues with filesizes.

 

Any ideas?


------------------------------------------------------------------------------
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Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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Re: Iometer on Linux having issues with SSD and large filesize

Neto, Antonio Jose Rodrigues

HI Alan,

 

This is neto from Brazil

 

How are you?

 

I am running here with RHEL 5.6 and it’s working ok

 

Try to run against raw devices (e.g. dm-0) for example

 

All the best

 

neto

 

From: WRIGHT Alan [UK] [mailto:[hidden email]]
Sent: Tuesday, August 28, 2012 11:19 AM
To: [hidden email]
Subject: Re: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Hi Antonio,

I tried latest from SVN, and compiled for CentOS 6.3, but its worse, even 1GB file with @latest is poor.

 

L

 

Alan

 

From: Neto, Antonio Jose Rodrigues [mailto:[hidden email]]
Sent: 28 August 2012 14:52
To: WRIGHT Alan [UK]; [hidden email]
Subject: RE: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Hi Alan,

 

This is neto from Brazil

 

How are  you?

 

Please try to use the latest SVN version with O_DIRECT support on Linux and libaio.

 

Please let me know if you need any help

 

All the best

 

neto

 

From: WRIGHT Alan [UK] [hidden email]
Sent: Tuesday, August 28, 2012 9:34 AM
To: [hidden email]
Subject: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Doing some tests on Random access to SSD’s I am finding that with large filesize 2GB or greater, SSD performance with Iometer is very poor.

 

With an HP P410i controller and 4 SSD’s in RAID10, I am managing 110K IOPS and 910MB/s with a 1GB iobw.tst filesize and this is stable.

 

If I grow the file to 2GB or greater, then performance is very poor ~30MB/s, all I have done is change the iobw.tst filesize (all other parameters the same)

 

The device under test is an HP DL360G6 with CentOS6.3 64bit

 

I have attempted the same test case with 1GB file and 10GB file on my laptop (Windows7 64bit), for both cases, I get the same performance and stable at around 18KIOPS and 160MB/s. I would therefore discount the theory that the disk controllers have issues with filesizes.

 

Any ideas?


------------------------------------------------------------------------------
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Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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Re: Iometer on Linux having issues with SSD and large filesize

WRIGHT Alan [UK]

Hi Neto,

Same issue, performance is bad, even with the raw devices L

 

Cheers

Alan

 

From: Neto, Antonio Jose Rodrigues [mailto:[hidden email]]
Sent: 28 August 2012 16:25
To: WRIGHT Alan [UK]; [hidden email]
Subject: RE: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

HI Alan,

 

This is neto from Brazil

 

How are you?

 

I am running here with RHEL 5.6 and it’s working ok

 

Try to run against raw devices (e.g. dm-0) for example

 

All the best

 

neto

 

From: WRIGHT Alan [UK] [hidden email]
Sent: Tuesday, August 28, 2012 11:19 AM
To: [hidden email]
Subject: Re: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Hi Antonio,

I tried latest from SVN, and compiled for CentOS 6.3, but its worse, even 1GB file with @latest is poor.

 

L

 

Alan

 

From: Neto, Antonio Jose Rodrigues [hidden email]
Sent: 28 August 2012 14:52
To: WRIGHT Alan [UK]; [hidden email]
Subject: RE: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Hi Alan,

 

This is neto from Brazil

 

How are  you?

 

Please try to use the latest SVN version with O_DIRECT support on Linux and libaio.

 

Please let me know if you need any help

 

All the best

 

neto

 

From: WRIGHT Alan [UK] [hidden email]
Sent: Tuesday, August 28, 2012 9:34 AM
To: [hidden email]
Subject: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Doing some tests on Random access to SSD’s I am finding that with large filesize 2GB or greater, SSD performance with Iometer is very poor.

 

With an HP P410i controller and 4 SSD’s in RAID10, I am managing 110K IOPS and 910MB/s with a 1GB iobw.tst filesize and this is stable.

 

If I grow the file to 2GB or greater, then performance is very poor ~30MB/s, all I have done is change the iobw.tst filesize (all other parameters the same)

 

The device under test is an HP DL360G6 with CentOS6.3 64bit

 

I have attempted the same test case with 1GB file and 10GB file on my laptop (Windows7 64bit), for both cases, I get the same performance and stable at around 18KIOPS and 160MB/s. I would therefore discount the theory that the disk controllers have issues with filesizes.

 

Any ideas?


------------------------------------------------------------------------------
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Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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Re: Iometer on Linux having issues with SSD and large filesize

koreaseal89
LLLLLLLLLLLLLLLL
what can I say
 

koreaseal89
 
Date: 2012-08-29 16:14
Subject: Re: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

Hi Neto,

Same issue, performance is bad, even with the raw devices L

 

Cheers

Alan

 

From: Neto, Antonio Jose Rodrigues [mailto:[hidden email]]
Sent: 28 August 2012 16:25
To: WRIGHT Alan [UK]; [hidden email]
Subject: RE: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

HI Alan,

 

This is neto from Brazil

 

How are you?

 

I am running here with RHEL 5.6 and it’s working ok

 

Try to run against raw devices (e.g. dm-0) for example

 

All the best

 

neto

 

From: WRIGHT Alan [UK] [hidden email]
Sent: Tuesday, August 28, 2012 11:19 AM
To: [hidden email]
Subject: Re: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Hi Antonio,

I tried latest from SVN, and compiled for CentOS 6.3, but its worse, even 1GB file with @latest is poor.

 

L

 

Alan

 

From: Neto, Antonio Jose Rodrigues [hidden email]
Sent: 28 August 2012 14:52
To: WRIGHT Alan [UK]; [hidden email]
Subject: RE: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Hi Alan,

 

This is neto from Brazil

 

How are  you?

 

Please try to use the latest SVN version with O_DIRECT support on Linux and libaio.

 

Please let me know if you need any help

 

All the best

 

neto

 

From: WRIGHT Alan [UK] [hidden email]
Sent: Tuesday, August 28, 2012 9:34 AM
To: [hidden email]
Subject: [Iometer-user] Iometer on Linux having issues with SSD and large filesize

 

Doing some tests on Random access to SSD’s I am finding that with large filesize 2GB or greater, SSD performance with Iometer is very poor.

 

With an HP P410i controller and 4 SSD’s in RAID10, I am managing 110K IOPS and 910MB/s with a 1GB iobw.tst filesize and this is stable.

 

If I grow the file to 2GB or greater, then performance is very poor ~30MB/s, all I have done is change the iobw.tst filesize (all other parameters the same)

 

The device under test is an HP DL360G6 with CentOS6.3 64bit

 

I have attempted the same test case with 1GB file and 10GB file on my laptop (Windows7 64bit), for both cases, I get the same performance and stable at around 18KIOPS and 160MB/s. I would therefore discount the theory that the disk controllers have issues with filesizes.

 

Any ideas?


------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
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