On Wed, Jun 14, 2006 at 10:46:09AM -0500, Bill Cizek wrote:
> I was able to work around this by lowering
> /proc/sys/dev/raid/speed_limit_max to a value
> below my disk thruput value (~ 50 MB/s) as follows:
IMHO a much better fix is to use the cfq I/O scheduler during the
rebuild. The default anticipatory scheduler gives horrible latencies
and can cause the machine to appear as 'locked up' if there is heavy
I/O load like a RAID reconstruct or heavy database usage.
The price of cfq is lower throughput (higher RAID rebuild time) than
with the anticipatory I/O scheduler.
Gabor
--
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MTA SZTAKI Computer and Automation Research Institute
Hungarian Academy of Sciences
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