[RndTbl] RAID5 rebuild performance

Kevin McGregor kevin.a.mcgregor at gmail.com
Thu May 19 14:47:40 CDT 2011


Did that, no effect. Building a RAID10 array of 14 10K disks (including two
hot spares, so really 12 disks) on the same controller (different channel,
not at the same time as the RAID5 rebuild) gives ~130,000 KB/sec.

On Thu, May 19, 2011 at 1:57 PM, Gerald Brandt <gbr at majentis.com> wrote:

> Linux has speed limits on rebuilds, check
>
>
> /proc/sys/dev/raid/speed_limit_max
> /proc/sys/dev/raid/speed_limit_min
>
> and echo new values into there.
>
> Gerald
>
> ------------------------------
>
> I installed Ubuntu Server 10.04.2 LTS AMD64 on a HP ProLiant ML370 G3 (4 x
> dual-core/hyperthreaded Xeon 2.66 GHz, 8 GB RAM) and I used the on-board
> SCSI controller to manage 8 x 300 GB 15K RPM SCSI drives in a software RAID
> 5 set up as a 7-drive array with 1 hot-spare drive. All drives are the exact
> same model with the same firmware version.
>
> It's currently rebuilding the array (because I just created the array) and
> /proc/mdstat is reporting "finish=165.7min speed=25856K/sec". Does that
> sound "right" in the sense that it's the right order of magnitude? I though
> it should be higher, but I haven't set up such an array before, so I don't
> have anything to compare it to.
>
> If it's slow, does anyone have a suggestion for speeding it up?
>
> Kevin
>
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