[CentOS] variable raid1 rebuild speed?

Wed Jan 12 19:17:35 UTC 2011
m.roth at 5-cent.us <m.roth at 5-cent.us>

Les Mikesell wrote:
> I have a 750Gb 3-member software raid1 where 2 partitions are always
present and the
> third is regularly rotated and re-synced (SATA disks in hot-swap bays). 
The timing of
> the resync seems to be extremely variable recently, taking anywhere from
3 to 10 hours
> even if the partition is unmounted and the drives aren't doing anything
else and
> regardless of what I echo into /proc/sys/dev/raid/speed_limit_min or
_max.  Is there
> some way to tell if the drives are going bad or speed it up consistently
if they aren't?

Only thing I can think is if there's a lot of activity on the disks, with
many, many gigs of files added or deleted.