Hello,
I've been playing on RHEL 5.3 with CLVM and exclusive activation but the results I'm getting are not what I'm expecting.
- My cluster is a freshly 2 nodes (node1 and node2) installed cluster with the packages shipped by RHEL 5.3 X86_64.
- LVM locking type = 3
- a San LUN (/dev/mpath/mpath2) visible from both nodes
- dlm used as lock_manager
Everything starts normally from cman to clvmd.
Below what I'm doing
On node1:
pvcreate /dev/mpath/mpath2
vgcreate -c n vg11 /dev/mpath/mpath2
! nothing in /debug/dlm/clvmd_locks on both nodes
vgchange -a n vg11
! nothing in /debug/dlm/clvmd_locks on both nodes
vgchange -c y vg11
! nothing in /debug/dlm/clvmd_locks on both nodes, vg seen on both nodes as clustered.
vgchange -a ey vg11
! nothing in /debug/dlm/clvmd_locks on both nodes
lvcreate -n lvol1 -L 6G /dev/vg11
On node1 cat /debug/dlm/clvmd_locks gives:
6f0001 2 3da0001 2204 0 1 10001 2 1 -1 0 0 64 "iZ8vgn7nBm05aMSo5cfpy63rflTqL2ryr3Xrp1prEGceCkA2dhSA2ENWocunEfdf"
38a0001 0 0 434 0 1 1 2 1 -1 0 0 64 "iZ8vgn7nBm05aMSo5cfpy63rflTqL2ryr3Xrp1prEGceCkA2dhSA2ENWocunEfdf"
On node2:
3da0001 1 6f0001 2204 0 1 1 2 1 -1 0 1 64 "iZ8vgn7nBm05aMSo5cfpy63rflTqL2ryr3Xrp1prEGceCkA2dhSA2ENWocunEfdf"
Is there something I'm doing wrong or misunderstand?
I understand that node1 (which actually activated exclusively the vg) sees a lock on /dev/vg11/lvol1 (uuid corresponding to it) from node id 2 wich is node2
plus a lock from node id 0 (which seems to be the quorun disk id which is not configured in my case).
Plus, node2 seems to see the right lock from node1.
I go on:
on both nodes, lvdisplay -v /dev/vg11/lvol1 gives:
...
LV UUID r3Xrp1-prEG-ceCk-A2dh-SA2E-NWoc-unEfdf
LV Write Access read/write
LV Status available
...
Shouldn't it be seen NOT available on node2 ?
Now, on node2:
vgchange -a y vg11 :
1 logical volume(s) in volume group "vg11" now active <-- vg was supposed to be held exlusively by node1
cat /debug/dlm/clvmd_locks gives:
3da0001 1 6f0001 2204 0 1 1 2 1 -1 0 1 64 "iZ8vgn7nBm05aMSo5cfpy63rflTqL2ryr3Xrp1prEGceCkA2dhSA2ENWocunEfdf"
on node1:
6f0001 2 3da0001 2204 0 1 10001 2 1 -1 0 0 64 "iZ8vgn7nBm05aMSo5cfpy63rflTqL2ryr3Xrp1prEGceCkA2dhSA2ENWocunEfdf"
38a0001 0 0 434 0 1 1 2 1 -1 0 0 64 "iZ8vgn7nBm05aMSo5cfpy63rflTqL2ryr3Xrp1prEGceCkA2dhSA2ENWocunEfdf"
I may be missing something in my procedure that makes it do everything except what I'm expecting.
Any ideas ?
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