performance bottleneck in Linux MD RAID-1

Pavel Mateja pavel at
Fri Jul 16 02:29:16 CDT 2010

> Thanks for the response. Indeed, we did let it finish syncing.. we had to
> let it run overnight to finish syncing. But, we also noticed that while it
> was syncing /dev/sda to /dev/sdc, the sync rate as observed in /proc/mdstat
> and iostat was limited to 200MB/sec.

Check /proc/sys/dev/raid/speed_limit_max please.
Pavel Mateja

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