Re: [RndTbl] RAID5 rebuild performance

-- Sean (mobile) On 2011-05-19, at 2:47 PM, Kevin McGregor kevin.a.mcgregor@gmail.com wrote: > 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@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 > > _______________________________________________ > Roundtable mailing list > Roundtable@muug.mb.ca > http://www.muug.mb.ca/mailman/listinfo/roundtable > > > _______________________________________________ > Roundtable mailing list > Roundtable@muug.mb.ca > http://www.muug.mb.ca/mailman/listinfo/roundtable > > > _______________________________________________ > Roundtable mailing list > Roundtable@muug.mb.ca > http://www.muug.mb.ca/mailman/listinfo/roundtable