It looks like it is rebuilding to a spare or new disk. If this is a new array, I would think that create would be writing to all disks, but not sure. I noticed the speed is about 10000K/sec/disk Maybe it can go faster, try this: To see current limit: cat /proc/sys/dev/raid/speed_limit_max To set new limit: echo 100000 > /proc/sys/dev/raid/speed_limit_max for details: man md Guy > -----Original Message----- > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > owner@xxxxxxxxxxxxxxx] On Behalf Of Christopher Smith > Sent: Sunday, July 03, 2005 2:20 AM > To: linux-raid@xxxxxxxxxxxxxxx > Subject: RAID5 rebuild question > > While waiting for a rather large RAID5 array to build, I noticed the > following output from iostat -k 1: > > Linux 2.6.11-1.1369_FC4smp (justinstalled.syd.nighthawkrad.net) > 04/07/05 > > avg-cpu: %user %nice %sys %iowait %idle > 1.10 0.00 5.24 2.45 91.21 > > Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn > hda 7.79 58.17 46.26 82741 65802 > sda 86.70 8221.20 391.64 11693016 557032 > sdb 81.11 8221.16 15.06 11692952 21416 > sdc 80.85 8221.18 14.16 11692980 20136 > sdd 80.93 8221.20 15.06 11693016 21416 > sde 81.01 8221.20 15.37 11693016 21864 > sdf 80.79 8221.20 14.16 11693016 20136 > sdg 80.91 8221.20 14.52 11693016 20648 > sdh 79.67 8221.16 6.91 11692952 9832 > sdi 78.95 8221.20 0.03 11693016 40 > sdj 79.04 8221.20 0.03 11693016 40 > sdk 79.48 8221.20 0.03 11693016 40 > sdl 93.28 0.33 8269.91 472 11762288 > md0 1.60 0.00 102.28 0 145472 > > avg-cpu: %user %nice %sys %iowait %idle > 0.49 0.00 7.35 0.00 92.16 > > Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn > hda 0.00 0.00 0.00 0 0 > sda 100.99 9417.82 0.00 9512 0 > sdb 101.98 9417.82 0.00 9512 0 > sdc 100.00 9417.82 0.00 9512 0 > sdd 98.02 9417.82 0.00 9512 0 > sde 96.04 9417.82 0.00 9512 0 > sdf 96.04 9417.82 0.00 9512 0 > sdg 96.04 9417.82 0.00 9512 0 > sdh 96.04 9417.82 0.00 9512 0 > sdi 99.01 9417.82 0.00 9512 0 > sdj 100.00 9417.82 0.00 9512 0 > sdk 99.01 9417.82 0.00 9512 0 > sdl 109.90 0.00 9504.95 0 9600 > md0 0.00 0.00 0.00 0 0 > > avg-cpu: %user %nice %sys %iowait %idle > 0.00 0.00 5.53 0.00 94.47 > > Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn > hda 0.00 0.00 0.00 0 0 > sda 102.02 9765.66 0.00 9668 0 > sdb 108.08 9765.66 0.00 9668 0 > sdc 108.08 9765.66 0.00 9668 0 > sdd 108.08 9765.66 0.00 9668 0 > sde 103.03 9765.66 0.00 9668 0 > sdf 103.03 9765.66 0.00 9668 0 > sdg 103.03 9765.66 0.00 9668 0 > sdh 102.02 9765.66 0.00 9668 0 > sdi 105.05 9765.66 0.00 9668 0 > sdj 105.05 9765.66 0.00 9668 0 > sdk 103.03 9765.66 0.00 9668 0 > sdl 120.20 0.00 9696.97 0 9600 > md0 0.00 0.00 0.00 0 0 > > avg-cpu: %user %nice %sys %iowait %idle > 0.00 0.00 6.00 0.00 94.00 > > Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn > hda 0.00 0.00 0.00 0 0 > sda 109.90 9500.99 0.00 9596 0 > sdb 103.96 9500.99 0.00 9596 0 > sdc 107.92 9500.99 0.00 9596 0 > sdd 106.93 9500.99 0.00 9596 0 > sde 104.95 9500.99 0.00 9596 0 > sdf 102.97 9500.99 0.00 9596 0 > sdg 104.95 9500.99 0.00 9596 0 > sdh 102.97 9500.99 0.00 9596 0 > sdi 101.98 9500.99 0.00 9596 0 > sdj 101.98 9500.99 0.00 9596 0 > sdk 101.98 9500.99 0.00 9596 0 > sdl 154.46 0.00 9536.63 0 9632 > md0 0.00 0.00 0.00 0 0 > > avg-cpu: %user %nice %sys %iowait %idle > 0.00 0.00 5.50 0.00 94.50 > > Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn > hda 0.00 0.00 0.00 0 0 > sda 100.99 9401.98 0.00 9496 0 > sdb 100.00 9401.98 0.00 9496 0 > sdc 98.02 9401.98 0.00 9496 0 > sdd 100.00 9401.98 0.00 9496 0 > sde 97.03 9401.98 0.00 9496 0 > sdf 94.06 9401.98 0.00 9496 0 > sdg 95.05 9401.98 0.00 9496 0 > sdh 96.04 9401.98 0.00 9496 0 > sdi 96.04 9401.98 0.00 9496 0 > sdj 95.05 9401.98 0.00 9496 0 > sdk 97.03 9401.98 0.00 9496 0 > sdl 127.72 0.00 9600.00 0 9696 > md0 0.00 0.00 0.00 0 0 > > avg-cpu: %user %nice %sys %iowait %idle > 0.00 0.00 5.97 0.00 94.03 > > Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn > hda 2.00 0.00 32.00 0 32 > sda 90.00 9676.00 0.00 9676 0 > sdb 91.00 9676.00 0.00 9676 0 > sdc 90.00 9676.00 0.00 9676 0 > sdd 90.00 9676.00 0.00 9676 0 > sde 90.00 9676.00 0.00 9676 0 > sdf 89.00 9676.00 0.00 9676 0 > sdg 89.00 9676.00 0.00 9676 0 > sdh 89.00 9676.00 0.00 9676 0 > sdi 89.00 9676.00 0.00 9676 0 > sdj 89.00 9676.00 0.00 9676 0 > sdk 89.00 9676.00 0.00 9676 0 > sdl 124.00 0.00 9600.00 0 9600 > md0 0.00 0.00 0.00 0 0 > > > Devices sd[a-l] make up /dev/md0: > [root@justinstalled ~]# cat /proc/mdstat > Personalities : [raid5] > md0 : active raid5 sdl[12] sdk[10] sdj[9] sdi[8] sdh[7] sdg[6] sdf[5] > sde[4] sdd[3] sdc[2] sdb[1] sda[0] > 1719198976 blocks level 5, 128k chunk, algorithm 2 [12/11] > [UUUUUUUUUUU_] > [>....................] recovery = 2.4% (3837952/156290816) > finish=256.7min speed=9895K/sec > unused devices: <none> > [root@justinstalled ~]# > > > Why are all the writes concentrated on a single drive ? Shouldn't the > reads and writes be being distributed evenly amongst all the drives ? > Or is this just something unique to the rebuild phase ? > > CS > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
