* RAID1 resync speed in 2.6.0
@ 2004-01-05 20:54 Måns Rullgård
2004-01-06 11:03 ` Måns Rullgård
0 siblings, 1 reply; 2+ messages in thread
From: Måns Rullgård @ 2004-01-05 20:54 UTC (permalink / raw)
To: linux-kernel
I just set up a largish (~100 GB) RAID1 array under Linux 2.6.0. Now,
/proc/mdstat is happily telling me that the resync will be completed
in 3700 minutes. This seems terribly slow to me. At first, it
wouldn't work at all, complaining about "bio too big", so I changed
RESYNC_BLOCK_SIZE to 32k.
Is there a way to mark the superblocks as up to date manually? I
don't really care what a read will return for parts of the array that
I haven't written to yet.
--
Måns Rullgård
mru@kth.se
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: RAID1 resync speed in 2.6.0
2004-01-05 20:54 RAID1 resync speed in 2.6.0 Måns Rullgård
@ 2004-01-06 11:03 ` Måns Rullgård
0 siblings, 0 replies; 2+ messages in thread
From: Måns Rullgård @ 2004-01-06 11:03 UTC (permalink / raw)
To: linux-kernel
mru@kth.se (Måns Rullgård) writes:
> I just set up a largish (~100 GB) RAID1 array under Linux 2.6.0. Now,
> /proc/mdstat is happily telling me that the resync will be completed
> in 3700 minutes. This seems terribly slow to me. At first, it
> wouldn't work at all, complaining about "bio too big", so I changed
> RESYNC_BLOCK_SIZE to 32k.
I found it. It's a raid1 on top of raid0. Apparently the raid1
resync considered the I/O from the raid0 devices to the physical disks
as normal I/O and reduced the speed. I increased the min rate in
/proc/... and now it's resyncing at 40 MB/s. Much better.
--
Måns Rullgård
mru@kth.se
^ permalink raw reply [flat|nested] 2+ messages in thread
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