* [linux-lvm] Does cmirror can tolerate one faulty PV?
@ 2017-10-31 9:13 Eric Ren
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From: Eric Ren @ 2017-10-31 9:13 UTC (permalink / raw)
To: LVM general discussion and development
I performed a fault tolerance testing on cmirrored LV in cluster with
The result really surprises me: a cmirrored LV cannot continue to work
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
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
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