By default in RHEL5.5:
/proc/sys/dev/raid/speed_limit_min is 1000, and /proc/sys/dev/raid/speed_limit_max is 200000.
After changing /proc/sys/dev/raid/speed_limit_max to 800000, noticed RAID1 mirror resync speed goes up to 516M/sec, much faster than the default one, which is around 200M/sec.
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