Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-31 Thread Paul Kraus
A couple points in line below ... On Wed, Oct 26, 2011 at 10:56 PM, weiliam.hong weiliam.h...@gmail.com wrote: I have a fresh installation of OI151a: - SM X8DTH, 12GB RAM, LSI 9211-8i (latest IT-mode firmware) - pool_A : SG ES.2 Constellation (SAS) - pool_B : WD RE4 (SATA) - no settings in

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-31 Thread weiliam.hong
Thanks for the reply. Some background.. The server is fresh installed. Right before running the tests, the pools are newly created. Some comments below On 10/31/2011 10:33 PM, Paul Kraus wrote: A couple points in line below ... On Wed, Oct 26, 2011 at 10:56 PM,

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-31 Thread Richard Elling
On Oct 26, 2011, at 7:56 PM, weiliam.hong wrote: Questions: 1. Why does SG SAS drives degrade to 10 MB/s while WD RE4 remain consistent at 100MB/s after 10-15 min? 2. Why does SG SAS drive show only 70+ MB/s where is the published figures are 100MB/s refer here? Are the SAS drives

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-31 Thread weiliam.hong
Thanks for the reply. On 11/1/2011 11:03 AM, Richard Elling wrote: On Oct 26, 2011, at 7:56 PM, weiliam.hong wrote: Questions: 1. Why does SG SAS drives degrade to10 MB/s while WD RE4 remain consistent at100MB/s after 10-15 min? 2. Why does SG SAS drive show only 70+ MB/s where is the

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-27 Thread Edward Ned Harvey
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- boun...@opensolaris.org] On Behalf Of weiliam.hong 3. All 4 drives are connected to a single HBA, so I assume the mpt_sas driver is used. Are SAS and SATA drives handled differently ? If they're all on the same HBA, they may be

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-27 Thread Brian Wilson
On 10/27/11 07:03 AM, Edward Ned Harvey wrote: From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- boun...@opensolaris.org] On Behalf Of weiliam.hong 3. All 4 drives are connected to a single HBA, so I assume the mpt_sas driver is used. Are SAS and SATA drives handled differently ?

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-27 Thread Jason J. W. Williams
if you get rid of the HBA and log device, and run with ZIL disabled (if your work load is compatible with a disabled ZIL.) By get rid of the HBA I assume you mean put in a battery-backed RAID card instead? -J ___ zfs-discuss mailing list

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-27 Thread weiliam.hong
Hi, Thanks for the replies. In the beginning, I only had SAS drives installed when I observed the behavior, the SATA drives were added later for comparison and troubleshooting. The slow behavior is observed only after 10-15mins of running dd where the file size is about 15GB, then the

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-27 Thread Erik Trimble
It occurs to me that your filesystems may not be in the same state. That is, destroy both pools. Recreate them, and run the tests. This will eliminate any possibility of allocation issues. -Erik On 10/27/2011 10:37 AM, weiliam.hong wrote: Hi, Thanks for the replies. In the beginning, I

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-27 Thread Erik Forsberg
. -- Original Message -- Date: Thu, 27 Oct 2011 14:33:25 -0700 From: Erik Trimble tr...@netdemons.com To: zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] Poor relative performance of SAS over SATA drives It occurs to me that your filesystems may not be in the same state. That is, destroy both pools

Re: [zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-27 Thread Hong Wei Liam
From: Erik Trimble tr...@netdemons.com To: zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] Poor relative performance of SAS over SATA drives It occurs to me that your filesystems may not be in the same state. That is, destroy both pools. Recreate them, and run the tests

[zfs-discuss] Poor relative performance of SAS over SATA drives

2011-10-26 Thread weiliam.hong
Greetings, I have a fresh installation of OI151a: - SM X8DTH, 12GB RAM, LSI 9211-8i (latest IT-mode firmware) - pool_A : SG ES.2 Constellation (SAS) - pool_B : WD RE4 (SATA) - no settings in /etc/system *zpool status output* --- admin@openindiana:~# zpool status pool: pool_A