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Hi, After some additional testing I’ve checked
that the problem is related with dm-multipath, using /dev/sd devices instead of
the multipath devices everything went fine. Is cmirror supposed to work fine with
dm-multipath or is it not supported?, is this a bug? Best regards, Alfredo From:
linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Moralejo, Alfredo Hi, I’m testing clustered mirror with RHEL 5.3 and I’m finding
weird behavior. I’ve installed and enabled cmirror and created a couple of
mirrored logical volumes (after some fight with clvmd errors…): [root@rmamseslab07 usr]# lvs
-a -o +devices lvol8
vg00 -wi-ao
4.00G
/dev/cciss/c0d0p2(736)
lv_mirror
vgcluster mwi-ao
1.00G
lv_mirror_mlog 100.00
lv_mirror_mimage_0(0),lv_mirror_mimage_1(0) [lv_mirror_mimage_0]
vgcluster iwi-ao
1.00G
/dev/mapper/mpath0p2(0)
[lv_mirror_mimage_1]
vgcluster iwi-ao
1.00G
/dev/mapper/mpqdiskp5(512)
[lv_mirror_mlog] vgcluster lwi-ao
4.00M
/dev/mapper/mpath0p1(0)
lv_test1
vgcluster -wi-ao 1.00G
/dev/mapper/mpqdiskp5(256)
lv_test4
vgcluster mwi-ao 1.00G
lv_test4_mlog
100.00
lv_test4_mimage_0(0),lv_test4_mimage_1(0) [lv_test4_mimage_0] vgcluster iwi-ao
1.00G
/dev/mapper/mpqdiskp5(0)
[lv_test4_mimage_1] vgcluster iwi-ao
1.00G
/dev/mapper/mpath0p2(256)
[lv_test4_mlog]
vgcluster lwi-ao
4.00M
/dev/mapper/mpath0p1(1)
[root@rmamseslab07 usr]# I’m simulating the failure of a disk by disabling one of the
disks having a mirror leg from the storage array or from dm-multipath and the
result I get is not the desired one, simply, any lvm command hangs and
filesystem appears as hang as well. After enabling the disk again, everything
is recovered. Is anyone using successfully lvm mirror in a RH cluster with
RHEL 5.3 with dm-multipath devices? Is there any alternative for software mirroring to lvm
mirror for RHCS. i.e. VxVM or something like that? Best regards, Alfredo Moralejo F. Hoffmann-La Roche Ltd. Global Informatics Group Infrastructure Phone: +34 91 305 97 87 Confidentiality Note:
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