[RndTbl] RAID5 rebuild performance

Gerald Brandt gbr at majentis.com
Thu May 19 13:57:56 CDT 2011

Linux has speed limits on rebuilds, check 


and echo new values into there. 


----- Original Message -----

> 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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