On Thu, 11 Oct 2007 13:06:39 -0400, Bill Davidsen wrote:
> Andrew Clayton wrote:
> > On Fri, 5 Oct 2007 16:56:03 -0400, John Stoffel wrote:
> >
> > >> Can you start a 'vmstat 1' in one window, then start whatever
> > >> you do
> >> to
On Fri, 5 Oct 2007 16:56:03 -0400, John Stoffel wrote:
> Can you start a 'vmstat 1' in one window, then start whatever you do
> to get crappy performance. That would be interesting to see.
In trying to find something simple that can show the problem I'm
seeing. I think I may have found the culpr
On Wed, 3 Oct 2007 12:48:27 -0400 (EDT), Justin Piszcz wrote:
> Also if it is software raid, when you make the XFS filesyste, on it,
> it sets up a proper (and tuned) sunit/swidth, so why would you want
> to change that?
Oh I didn't, the sunit and swidth were set automatically. Do they look
sane?
On Fri, 5 Oct 2007 15:02:22 -0400, John Stoffel wrote:
>
> How much memory does this system have? Have you checked the output of
2GB
> /proc/mtrr at all? There' have been reports of systems with a bad
$ cat /proc/mtrr
reg00: base=0x ( 0MB), size=2048MB: write-back, count=1
> BIOS
On Fri, 5 Oct 2007 12:16:07 -0400 (EDT), Justin Piszcz wrote:
>
> Hm, unfortunately at this point I think I am out of ideas you may
> need to ask the XFS/linux-raid developers how to run blktrace during
> those operations to figure out what is going on.
No problem, cheers.
> BTW: Last thing I
On Fri, 5 Oct 2007 10:07:47 -0400 (EDT), Justin Piszcz wrote:
> Yikes, yeah I would get them off the PCI card, what kind of
> motherboard is it? If you don't have a PCI-e based board it probably
> won't help THAT much but it still should be better than placing 3
> drives on a PCI card.
Moved the
On Fri, 5 Oct 2007 10:07:47 -0400 (EDT), Justin Piszcz wrote:
> Yikes, yeah I would get them off the PCI card, what kind of
> motherboard is it? If you don't have a PCI-e based board it probably
> won't help THAT much but it still should be better than placing 3
> drives on a PCI card.
It's a Ty
On Fri, 5 Oct 2007 13:53:12 +0100, Andrew Clayton wrote:
> Unfortunately problem remains.
>
> I'll try the noop scheduler as I don't think I ever tried that one.
Didn't help either, oh well.
If I hit the disk in workstation with a big dd then in iostat I see it
maxi
On Fri, 5 Oct 2007 07:08:51 -0400 (EDT), Justin Piszcz wrote:
> The mount options are from when the filesystem was made for
> sunit/swidth I believe.
>
> -N Causes the file system parameters to be printed
> out without really creating the file system.
>
> You should be able to ru
On Fri, 5 Oct 2007 06:25:20 -0400 (EDT), Justin Piszcz wrote:
> So you have 3 SATA 1 disks:
Yeah, 3 of them in the array, there is a fourth standalone disk which
contains the root fs from which the system boots..
> http://digital-domain.net/kernel/sw-raid5-issue/mdadm-D
>
> Do you compile your
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 H
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
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 gradu
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
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
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
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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
On Wed, 3 Oct 2007 13:36:39 -0700, David Rees wrote:
> > # xfs_db -c frag -f /dev/md0
> > actual 1828276, ideal 1708782, fragmentation factor 6.54%
> >
> > Good or bad?
>
> Not bad, but not that good, either. Try running xfs_fsr into a nightly
> cronjob. By default, it will defrag mounted xfs fil
On Wed, 3 Oct 2007 16:35:21 -0400 (EDT), Justin Piszcz wrote:
> What does cat /sys/block/md0/md/mismatch_cnt say?
$ cat /sys/block/md0/md/mismatch_cnt
0
> That fragmentation looks normal/fine.
Cool.
> Justin.
Andrew
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On Wed, 03 Oct 2007 19:53:08 +0200, Goswin von Brederlow wrote:
> Andrew Clayton <[EMAIL PROTECTED]> writes:
>
> > Hi,
> >
> > Hardware:
> >
> > Dual Opteron 2GHz cpus. 2GB RAM. 4 x 250GB SATA hard drives. 1
> > (root file system) is connected
On Wed, 3 Oct 2007 12:43:24 -0400 (EDT), Justin Piszcz wrote:
> Have you checked fragmentation?
You know, that never even occurred to me. I've gotten into the mind set
that it's generally not a problem under Linux.
> xfs_db -c frag -f /dev/md3
>
> What does this report?
# xfs_db -c frag -f /de
Hi,
Hardware:
Dual Opteron 2GHz cpus. 2GB RAM. 4 x 250GB SATA hard drives. 1 (root file
system) is connected to the onboard Silicon Image 3114 controller. The other 3
(/home) are in a software RAID 5 connected to a PCI Silicon Image 3124 card. I
moved the 3 raid disks off the on board controll
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