Hi all,
I performed a fault tolerance testing on cmirrored LV in cluster with
lvm2-2.02.98.
The result really surprises me: a cmirrored LV cannot continue to work
after disabling
its one leg PV. Is this a known issue? Or am I doing something wrong?
The steps follows:
# clvmd and cmirrord started...
# vgcreate vg1 /dev/sda /dev/sdb
# lvcreate -L1G -n lv1 --mirrorlog mirrored vg1 /dev/sda /dev/sdb
# dd if=/dev/zero of=/dev/vg1/lv1 bs=1k count=1000 ===> OK
# lvchange -an vg1/lv1
# echo 1 > /sys/block/sdb/device/delete ==> disable one leg
# lvchange -ay --partial vg1/lv1
# dd if=/dev/zero of=/dev/vg1/lv1 bs=1k count=1000 ===> stuck forever
^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C
The following log repeats while dd command is stuck:
"""
Oct 31 13:39:37 sa kernel: [316278.368081] device-mapper:
dm-log-userspace: [NZ8pEil9] Request timed out: [9/178486] - retrying
Oct 31 13:39:37 sa kernel: [316278.448069] device-mapper:
dm-log-userspace: [NZ8pEil9] Request timed out: [15/178497] - retrying
Oct 31 13:39:52 sa kernel: [316293.368081] device-mapper:
dm-log-userspace: [NZ8pEil9] Request timed out: [9/178498] - retrying
....
"""
Thanks,
Eric
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