At 20:24 11-10-2001 -0700, Thomas Duffy wrote:
I have setup a little (280G) xfs on RAID 10 (RAID 1 on RAID 0). This
has 8 SCSI drives (4 per card).
Hardware, software or something in the middle?
Everything seems to work fine, expect the RAID resync craaaawwwllllsss.
It goes at the minimum of 100k/s which should take a few months to
finish syncing :) It sometimes bumps up to 250 k/s, but never higher
even with no system activity.
There is something about resyncing in the manpages of the raid tools IIRC.
What kernel are you using, any special options and compiled with what compiler.
IIRC there were some IO stalls fixed somewhere around 2.4.6.
First off, does anyone know of a way to bump the sync rate up? Could
this be some sorta weirdness between XFS and MD that is causing the slow
resync? On a simple RAID 1 setup (2 disks) w/ XFS on the device, the
resync is as speedy as the SCSI card allows when there is no other I/O
which is what I would expect from MD.
What version of md are you using and what scsi card is it.
Other info, I am using 64k chunk sizes on both the RAID 1 and RAID 0
with 4k block sizes on XFS (obiviously because it on i386). These are
10000 rpm ultra SCSI 3 drives, so they should scream. I was able to dd
a blank 200G file relatively fast using bs=64k on this device, so it
seems to be ok with creating/copying files.
That should be fine.
Cheers
--
Seth
Every program has two purposes one for which
it was written and another for which it wasn't
I use the last kind.
|