On Wed, 4 Apr 2012 14:51:52 +0100 Mathias Burén <mathias.buren@xxxxxxxxx> wrote: > On 4 April 2012 14:23, Peter Urbanec <linux-raid@xxxxxxxxxxx> wrote: > > I'm running Gentoo kernel 3.3.0 with raid5 on four ICH7 AHCI connected > > Seagate 2TB 7200RPM disks. I also have two WD 1TB Green disks in raid1 on a > > Sil3114 with a JBOD (non-RAID) BIOS. > > > > When I attempt to do a scrub/check on the raid5, the check seems to proceed > > without actually reading any data from the disks - the disk activity lights > > do not even flicker. > > > > Looking at the speed at which the check completes confirms this: > > > > # cat /proc/sys/dev/raid/speed_limit_min > > 10000 > > # cat /proc/sys/dev/raid/speed_limit_max > > 4000000 > > # echo check > devices/virtual/block/md0/md/sync_action > > # echo check > devices/virtual/block/md127/md/sync_action > > ... > > # cat /proc/mdstat > > Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] > > md127 : active raid1 sdf1[1] sde1[0] > > 976760384 blocks [2/2] [UU] > > [>....................] check = 1.7% (17387072/976760384) > > finish=380.7min speed=41994K/sec > > > > md0 : active raid5 sdb[1] sda[0] sdd[4] sdc[2] > > 5860535808 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] > > [UUUU] > > [==================>..] check = 93.9% (1835359616/1953511936) > > finish=0.8min speed=2332893K/sec > > > > > > raid1 runs at about 42MB/s as expected with two WD 1TB Green drives. > > raid5 runs at well over 2GB/s - not really possible with four Seagate 2TB > > 7200RPM drives. > > > > Any ideas on what may be going on there and how to fix it. Let me know > > what/if more information may be needed. > > > > Thanks > > > > Peter Urbanec > > > > -- > > 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 > > FWIW I'm seeing this as well, kernel 3.3.1, but on RAID6. There's a > message just a few days about this, but no link to a patch. http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=c6d2e084c7411f61f2b446d94989e5aaf9879b0f NeilBrown > > Mathias > -- > 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
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