Cody Yellan wrote:
I had a 4x500GB SATA2 array, md0. I added one 500GB drive and
reshaping began at ~2500K/sec. Changing
/proc/sys/dev/raid/speed_limit_m{in,ax} or
/sys/block/md0/md/sync_speed_m{in,ax} had no effect. I shut down all
unnecessary services and the array is offline (not mounted). I have
read that the throttling code is "fragile" (esp. with regard to
raid5) but does this make sense? I will wait (in)patiently for it to
finish, but I do wonder why the configuration parameters have no
effect. This is a dual quad 2GHz Xeon machine with 8GB of memory
running RHEL5. Is this the maximum speed?
Are you running a non-standard /sys/block/md5/md/stripe_cache_size?
I found when running a kernel of about that vintage on FC6 (which I
guess became RHEL5), that with a stripe_cache_size of 16384, resyncs
dropped down to about the speed you are seeing.
This changed back to more normal speeds with a later kernel, but I do
not recall which.
Regards,
Richard
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