[Linux-cluster] LVM Mirror in clustered environments
alfredo.moralejo at roche.com
Mon Aug 24 16:11:30 UTC 2009
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 at 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 at 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?
Business Platforms Engineering - OS Servers - UNIX Senior Specialist
F. Hoffmann-La Roche Ltd.
Global Informatics Group Infrastructure
Josefa Valcárcel, 40
28027 Madrid SPAIN
Phone: +34 91 305 97 87
alfredo.moralejo at roche.com<mailto:alfredo.moralejo at roche.com>
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