Same here, after upgrading from Lenny (stable) to Squeeze (stable):
# uname -a
Linux ibmersun 2.6.32-5-686 #1 SMP Mon Jan 16 16:04:25 UTC 2012 i686
GNU/Linux
===========================================================
[...]
[ 3.058027] scsi2 : ioc0: LSISAS1068 B0, FwRev=000a3100h, Ports=1,
MaxQ=366, IRQ=128
[ 3.099000] mptsas: ioc0: attaching sata device: fw_channel 0, fw_id
0, phy 0, sas_addr 0x1221000000000000
[ 3.102218] scsi 2:0:0:0: Direct-Access ATA ST3250620NS
3BKH PQ: 0 ANSI: 5
[ 3.104047] scsi 2:0:0:0: Attached scsi generic sg1 type 0
[ 3.105686] mptsas: ioc0: attaching sata device: fw_channel 0, fw_id
2, phy 2, sas_addr 0x1221000002000000
[ 3.108859] scsi 2:0:1:0: Direct-Access ATA ST3250620NS
3BKH PQ: 0 ANSI: 5
[ 3.110685] scsi 2:0:1:0: Attached scsi generic sg2 type 0
[ 3.118941] sd 2:0:0:0: [sda] 488281250 512-byte logical blocks: (250
GB/232 GiB)
[ 3.119191] sd 2:0:1:0: [sdb] 488281250 512-byte logical blocks: (250
GB/232 GiB)
[ 3.166811] sd 2:0:1:0: [sdb] Write Protect is off
[ 3.166814] sd 2:0:1:0: [sdb] Mode Sense: 73 00 00 08
[ 3.169391] sd 2:0:1:0: [sdb] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 3.169744] sd 2:0:0:0: [sda] Write Protect is off
[ 3.169747] sd 2:0:0:0: [sda] Mode Sense: 73 00 00 08
[ 3.172658] sd 2:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 3.211041] sdb:
[ 3.213967] sda: sdb1 sdb2 sdb3
[ 3.227179] sda1 sda2 sda3
[ 3.338736] sd 2:0:1:0: [sdb] Attached SCSI disk
[ 3.347212] sd 2:0:0:0: [sda] Attached SCSI disk
[ 3.665106] md: raid1 personality registered for level 1
[ 3.668324] mdadm: sending ioctl 800c0910 to a partition!
[ 3.668326] mdadm: sending ioctl 800c0910 to a partition!
[ 3.668330] mdadm: sending ioctl 1261 to a partition!
[ 3.668331] mdadm: sending ioctl 1261 to a partition!
[ 3.668498] mdadm: sending ioctl 1261 to a partition!
[ 3.668501] mdadm: sending ioctl 1261 to a partition!
[ 3.668668] mdadm: sending ioctl 1261 to a partition!
[ 3.668670] mdadm: sending ioctl 1261 to a partition!
[ 3.670240] mdadm: sending ioctl 1261 to a partition!
[ 3.670242] mdadm: sending ioctl 1261 to a partition!
[ 3.671193] mdadm: sending ioctl 1261 to a partition!
[ 3.671195] mdadm: sending ioctl 1261 to a partition!
[ 3.671330] mdadm: sending ioctl 1261 to a partition!
[ 3.671333] mdadm: sending ioctl 1261 to a partition!
[ 3.671644] mdadm: sending ioctl 800c0910 to a partition!
[ 3.671646] mdadm: sending ioctl 800c0910 to a partition!
[ 3.671663] mdadm: sending ioctl 800c0910 to a partition!
[ 3.671665] mdadm: sending ioctl 800c0910 to a partition!
[ 3.671670] mdadm: sending ioctl 1261 to a partition!
[ 3.671671] mdadm: sending ioctl 1261 to a partition!
[ 3.671789] mdadm: sending ioctl 1261 to a partition!
[ 3.671791] mdadm: sending ioctl 1261 to a partition!
[ 3.671928] mdadm: sending ioctl 1261 to a partition!
[ 3.671930] mdadm: sending ioctl 1261 to a partition!
[ 3.672293] mdadm: sending ioctl 1261 to a partition!
[ 3.672295] mdadm: sending ioctl 1261 to a partition!
[ 3.672492] mdadm: sending ioctl 1261 to a partition!
[ 3.672494] mdadm: sending ioctl 1261 to a partition!
[ 3.680140] mdadm: sending ioctl 1261 to a partition!
[ 3.680143] mdadm: sending ioctl 1261 to a partition!
[ 3.681772] md: md0 stopped.
[ 3.681869] mdadm: sending ioctl 1261 to a partition!
[ 3.681871] mdadm: sending ioctl 1261 to a partition!
[ 3.682085] mdadm: sending ioctl 1261 to a partition!
[ 3.682086] mdadm: sending ioctl 1261 to a partition!
[ 3.682322] mdadm: sending ioctl 1261 to a partition!
[ 3.682323] mdadm: sending ioctl 1261 to a partition!
[ 3.682659] md: bind<sdb2>
[ 3.682771] md: bind<sda2>
[ 3.683932] raid1: raid set md0 active with 2 out of 2 mirrors
[ 3.683947] md0: detected capacity change from 0 to 246611968
[ 3.685265] md0: unknown partition table
[ 3.686945] mdadm: sending ioctl 1261 to a partition!
[ 3.686947] mdadm: sending ioctl 1261 to a partition!
[ 3.700249] mdadm: sending ioctl 1261 to a partition!
[ 3.700252] mdadm: sending ioctl 1261 to a partition!
[ 3.708262] mdadm: sending ioctl 1261 to a partition!
[ 3.708265] mdadm: sending ioctl 1261 to a partition!
[ 3.708412] mdadm: sending ioctl 1261 to a partition!
[ 3.708415] mdadm: sending ioctl 1261 to a partition!
[ 3.708632] mdadm: sending ioctl 1261 to a partition!
[ 3.708635] mdadm: sending ioctl 1261 to a partition!
[ 3.708862] mdadm: sending ioctl 800c0910 to a partition!
[ 3.708865] mdadm: sending ioctl 800c0910 to a partition!
[ 3.708881] mdadm: sending ioctl 800c0910 to a partition!
[ 3.708883] mdadm: sending ioctl 800c0910 to a partition!
[ 3.708888] mdadm: sending ioctl 1261 to a partition!
[ 3.708890] mdadm: sending ioctl 1261 to a partition!
[ 3.709054] mdadm: sending ioctl 1261 to a partition!
[ 3.709057] mdadm: sending ioctl 1261 to a partition!
[ 3.709229] mdadm: sending ioctl 1261 to a partition!
[ 3.709231] mdadm: sending ioctl 1261 to a partition!
[ 3.709411] mdadm: sending ioctl 1261 to a partition!
[ 3.709413] mdadm: sending ioctl 1261 to a partition!
[ 3.709533] mdadm: sending ioctl 1261 to a partition!
[ 3.709535] mdadm: sending ioctl 1261 to a partition!
[ 3.711075] md: md1 stopped.
[ 3.711093] mdadm: sending ioctl 1261 to a partition!
[ 3.711095] mdadm: sending ioctl 1261 to a partition!
[ 3.711331] mdadm: sending ioctl 1261 to a partition!
[ 3.711332] mdadm: sending ioctl 1261 to a partition!
[ 3.711517] mdadm: sending ioctl 1261 to a partition!
[ 3.711519] mdadm: sending ioctl 1261 to a partition!
[ 3.712048] md: bind<sdb3>
[ 3.713367] md: bind<sda3>
[ 3.714269] raid1: raid set md1 active with 2 out of 2 mirrors
[ 3.714283] md1: detected capacity change from 0 to 247753539584
[ 3.714903] md1: unknown partition table
[ 3.716596] mdadm: sending ioctl 1261 to a partition!
[ 3.716598] mdadm: sending ioctl 1261 to a partition!
[ 3.831853] PM: Starting manual resume from disk
[ 3.831856] PM: Resume from partition 8:1
[ 3.831857] PM: Checking hibernation image.
[ 3.832009] PM: Error -22 checking image file
[ 3.832011] PM: Resume from disk failed.
[ 3.839924] REISERFS (device md1): found reiserfs format "3.6" with
standard journal
[ 3.839933] REISERFS (device md1): using ordered data mode
[ 3.848303] REISERFS (device md1): journal params: device md1, size
8192, journal first block 18, max trans len 1024, max batch 900, max
commit age 30, max trans age 30
[ 3.848450] REISERFS (device md1): checking transaction log (md1)
[ 3.955120] REISERFS (device md1): Using r5 hash to sort names
[ 5.379435] udev[419]: starting version 164
[ 5.933303] mdadm: sending ioctl 1261 to a partition!
[ 5.933306] mdadm: sending ioctl 1261 to a partition!
[ 5.933311] mdadm: sending ioctl 1261 to a partition!
[ 5.933313] mdadm: sending ioctl 1261 to a partition!
[...]
===========================================================
# cat /etc/mdadm/mdadm.conf
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
DEVICE partitions
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# instruct the monitoring daemon where to send mail alerts
MAILADDR root
# definitions of existing MD arrays
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=04393dd2:4fe24092:099dc5f6:c83764a7
ARRAY /dev/md1 level=raid1 num-devices=2
UUID=5a9e75c0:b196fd69:78e3d437:75c57ac3
# This file was auto-generated on Mon, 10 Sep 2007 10:50:28 +0000
# by mkconf $Id: mkconf 261 2006-11-09 13:32:35Z madduck $
===========================================================
# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda3[0] sdb3[1]
241946816 blocks [2/2] [UU]
md0 : active raid1 sda2[0] sdb2[1]
240832 blocks [2/2] [UU]
unused devices: <none>
===========================================================
ii linux-image-2.6.32-5-686 2.6.32-41
ii mdadm 3.1.4-1+8efb9d1+squeeze1
===========================================================
Everything is working well (no hungs, no disk I/O problems of any kind)
so far...
Bestest,
-Chris
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