Yup. That makes sense. Raid 10 does't involve a parity calculation. Raid 10 is stripe and mirror so it's single read to single write. Raid 5 is multiple reads to single write on rebuild. Comparing the two for rebuild is an apples to oranges kinda thing. -- 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
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