Re: RAID1 resync speed in 2.6.0

[Måns Rullgård]

mru@xxxxxx (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@xxxxxx

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