Re: RAID 5 performance issue.

2007-10-04 Thread Andrew Clayton
On Thu, 04 Oct 2007 12:46:05 -0400, Steve Cousins wrote: > Andrew Clayton wrote: > > On Thu, 4 Oct 2007 10:39:09 -0400 (EDT), Justin Piszcz wrote: > > > > > > >> What type (make/model) of the drives? > >> > > > The drives are 250GB Hitachi Deskstar 7K250 series ATA-6 UDMA/100 > > A couple

Re: RAID 5 performance issue.

2007-10-04 Thread Andrew Clayton
On Thu, 4 Oct 2007 12:19:20 -0400 (EDT), Justin Piszcz wrote: > > 7K250 > > http://www.itreviews.co.uk/hardware/h912.htm > > http://techreport.com/articles.x/8362 > "The T7K250 also supports Native Command Queuing (NCQ)." > > You need to enable AHCI in order to reap the benefits though. Cheer

Re: RAID 5 performance issue.

2007-10-04 Thread Andrew Clayton
On Thu, 4 Oct 2007 12:20:25 -0400 (EDT), Justin Piszcz wrote: > > > On Thu, 4 Oct 2007, Andrew Clayton wrote: > > > On Thu, 4 Oct 2007 10:10:02 -0400 (EDT), Justin Piszcz wrote: > > > > > >> Also, did performance just go to crap one day or was it gradual? > > > > IIRC I just noticed one day tha

Re: RAID 5 performance issue.

2007-10-04 Thread Steve Cousins
Andrew Clayton wrote: On Thu, 4 Oct 2007 10:39:09 -0400 (EDT), Justin Piszcz wrote: What type (make/model) of the drives? The drives are 250GB Hitachi Deskstar 7K250 series ATA-6 UDMA/100 A couple of things: 1. I thought you had SATA drives 2. ATA-6 would be UDMA/133 Th

Re: RAID 5 performance issue.

2007-10-04 Thread Steve Cousins
Steve Cousins wrote: A couple of things: 1. I thought you had SATA drives 2. ATA-6 would be UDMA/133 Number 2 is not correct. Sorry about that. Steve - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to [EMAIL PROTECTED] More majordomo info

Re: RAID 5 performance issue.

2007-10-04 Thread Justin Piszcz
On Thu, 4 Oct 2007, Andrew Clayton wrote: On Thu, 4 Oct 2007 10:10:02 -0400 (EDT), Justin Piszcz wrote: Also, did performance just go to crap one day or was it gradual? IIRC I just noticed one day that firefox and vim was stalling. That was back in February/March I think. At the time the

Re: RAID 5 performance issue.

2007-10-04 Thread Justin Piszcz
On Thu, 4 Oct 2007, Andrew Clayton wrote: On Thu, 4 Oct 2007 10:39:09 -0400 (EDT), Justin Piszcz wrote: What type (make/model) of the drives? The drives are 250GB Hitachi Deskstar 7K250 series ATA-6 UDMA/100 True, the controller may not be able to do it either. What types of disks/con

Re: RAID 5 performance issue.

2007-10-04 Thread Andrew Clayton
On Thu, 4 Oct 2007 10:39:09 -0400 (EDT), Justin Piszcz wrote: > What type (make/model) of the drives? The drives are 250GB Hitachi Deskstar 7K250 series ATA-6 UDMA/100 > True, the controller may not be able to do it either. > > What types of disks/controllers again? The RAID disks are curren

Re: RAID 5 performance issue.

2007-10-04 Thread Andrew Clayton
On Thu, 4 Oct 2007 10:10:02 -0400 (EDT), Justin Piszcz wrote: > Also, did performance just go to crap one day or was it gradual? IIRC I just noticed one day that firefox and vim was stalling. That was back in February/March I think. At the time the server was running a 2.6.18 kernel, since then

Re: RAID 5 performance issue.

2007-10-04 Thread Justin Piszcz
On Thu, 4 Oct 2007, Andrew Clayton wrote: On Thu, 4 Oct 2007 10:09:22 -0400 (EDT), Justin Piszcz wrote: Is NCQ enabled on the drives? I don't think the drives are capable of that. I don't seen any mention of NCQ in dmesg. Andrew BTW You may not see 'NCQ' in the kernel messages unless

Re: RAID 5 performance issue.

2007-10-04 Thread Justin Piszcz
On Thu, 4 Oct 2007, Andrew Clayton wrote: On Thu, 4 Oct 2007 10:09:22 -0400 (EDT), Justin Piszcz wrote: Is NCQ enabled on the drives? I don't think the drives are capable of that. I don't seen any mention of NCQ in dmesg. Andrew What type (make/model) of the drives? True, the control

Re: RAID 5 performance issue.

2007-10-04 Thread Andrew Clayton
On Thu, 4 Oct 2007 10:09:22 -0400 (EDT), Justin Piszcz wrote: > Is NCQ enabled on the drives? I don't think the drives are capable of that. I don't seen any mention of NCQ in dmesg. Andrew - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to [EMAIL

Re: RAID 5 performance issue.

2007-10-04 Thread Justin Piszcz
On Thu, 4 Oct 2007, Justin Piszcz wrote: Is NCQ enabled on the drives? On Thu, 4 Oct 2007, Andrew Clayton wrote: On Wed, 3 Oct 2007 13:36:39 -0700, David Rees wrote: Not bad, but not that good, either. Try running xfs_fsr into a nightly cronjob. By default, it will defrag mounted xfs file

Re: RAID 5 performance issue.

2007-10-04 Thread Justin Piszcz
Is NCQ enabled on the drives? On Thu, 4 Oct 2007, Andrew Clayton wrote: On Wed, 3 Oct 2007 13:36:39 -0700, David Rees wrote: Not bad, but not that good, either. Try running xfs_fsr into a nightly cronjob. By default, it will defrag mounted xfs filesystems for up to 2 hours. Typically this is

Re: RAID 5 performance issue.

2007-10-04 Thread Andrew Clayton
On Wed, 3 Oct 2007 13:36:39 -0700, David Rees wrote: > Not bad, but not that good, either. Try running xfs_fsr into a nightly > cronjob. By default, it will defrag mounted xfs filesystems for up to > 2 hours. Typically this is enough to keep fragmentation well below 1%. I ran it last night on the