[CentOS] variable raid1 rebuild speed?

Wed Jan 12 19:44:11 UTC 2011
Les Mikesell <lesmikesell at gmail.com>

On 1/12/2011 1:17 PM, m.roth at 5-cent.us wrote:
> 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.

No, I'd expect the issue with any activity that would keep pulling the 
heads away from the current track being sync'd - but when it is slow it 
doesn't speed up even if I unmount the device.

   Les Mikesell
    lesmikesell at gmail.com