On Mon, Jun 6, 2011 at 10:20 PM, fibreraid@xxxxxxxxx <fibreraid@xxxxxxxxx> wrote: > Hello, > > I am running Linux kernel 2.6.38 64-bit version with mdadm 3.2.1. The > server hardware has dual socket Westmere CPUs (4 cores each), 24 GB of > RAM, and 24 hard drives connected via SAS. > > I create an md0 array with 23 active drives, 1 hot-spare, RAID 5, and > 64K chunk. After synchronization is complete, I have: > > root::~# cat /proc/mdstat > Personalities : [raid6] [raid5] [raid4] > md0 : active raid5 sdf1[23](S) sdi1[22] sdh1[21] sdg1[20] sde1[19] > sdd1[18] sdc1[17] sdo1[16] sdn1[15] sdq1[14] sdp1[13] sdr1[12] > sdm1[11] sdl1[10] sdk1[9] sdj1[8] sdv1[7] sdu1[6] sdt1[5] sds1[4] > sdy1[3] sdx1[2] sdb1[1] sdw1[0] > 2149005056 blocks super 1.2 level 5, 64k chunk, algorithm 2 > [23/23] [UUUUUUUUUUUUUUUUUUUUUUU] > > Then I remove an active drive from the system by unplugging it. udev > catches the event, and fdisk -l reports one less drive. In this case, > I remove /dev/sdv. > > However, /proc/mdstat remains unchanged. It's as if md has no idea > that the drive disappeared. I would expect md at this point to have > detected the removal, and to have automatically kicked-off a resync > using the included hot-spare. But this does not occur. > > If I then run mdadm -R /dev/md0, in an attempt to "wake up" md, then > md does realize the change, and does start the resyncing. I guess md realizes there is no drive when write/read error occurs, which gonna happen pretty soon if array is in usage, can you set some dd reading and then remove drive? > > I do not believe this is normal behavior. Can you advise? > > Thank you! > -Tommy > -- > 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 > -- Best regards, [COOLCOLD-RIPN] -- 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
