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тАО02-05-2004 05:16 AM
тАО02-05-2004 05:16 AM
What happens if the Quorum disk fails?
Is the scenario the same on the hosts - cluster reconfigure with msgs referencing the loss of the quorum disk or does something different happen?
What happens when the failed Quorum disk is made available again?
Do the hosts automatically recongize the appearance of the quorum disk and use it (with appropriate msgs)?
In other words, how does the loss/restore of a quorum disk compare to loss/restore of a host node?
One more question (for extra points!). What happens when the quorum disk "temporarily" disappears? We have our quorum disk on an HP SW SAN. If we make a Zoning or Presentation change that affects the quorum disk, besides VMS going through a Mount Verify, what does the host recovery look like?
Thanks much
Solved! Go to Solution.
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тАО02-05-2004 05:25 AM
тАО02-05-2004 05:25 AM
Re: Quorum Disk Failure
(in QDISKINTERVAL seconds)
You will see messages about the quorum disk being unavailable and as long as there are enough votes then the cluster will continue. When the qdsk returns it will be recognised as the quorum disk by the presence of the QUORUM.DAT and the votes (QDSKVOTES) counted.
I assume both systems are directly connected to the quorum disk.
Purely Personal Opinion
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тАО02-06-2004 06:15 AM
тАО02-06-2004 06:15 AM
SolutionIt is indirect. The first node to reconnect checks the quorumdisk for recent 'stamps' by the other node(s). They are not there, so it simply leaves its own imprint. The second one finds teh stamp (and it better be of a known node). It also leaves its trace, and the next time #1 comes along it can conclude that the quorum disk is a valid member again.
Even IF (unwanted situation) the departure of the quorumdisk leads to a loss of quorum (the cluster 'hangs') this mechanism is above the hang, and if the return of Qdsk suffices to regain quorum, that WILL be recognised, and the hang will be over.
jan
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тАО02-06-2004 08:33 AM
тАО02-06-2004 08:33 AM
Re: Quorum Disk Failure
Only in the event of a double failure does the surviving node hang.
Maybe that will help someone.
john
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тАО02-06-2004 09:14 PM
тАО02-06-2004 09:14 PM
Re: Quorum Disk Failure
works fine, but not even needed.
@ nodes each 1 vote + qdsk 1 vote = 3 votes expected. Any single voter gone leaves 2 vote +> quorum maintained.
The abovementioned temporary hang (and resume) would occur at one node out (eg, maintenace) and THEN having your SAN disconnecting and reconnecting the qdsk.
hth
Jan
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тАО02-07-2004 12:36 AM
тАО02-07-2004 12:36 AM
Re: Quorum Disk Failure
"@ nodes" should read "2 nodes"
" +> " " " " => "
... I sometimes (have to) work on systems with different keyboard layouts. It should have been forbidden, but then, who should be allowed to declare "THE" correct layout?
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тАО02-08-2004 10:29 PM
тАО02-08-2004 10:29 PM
Re: Quorum Disk Failure
I agree with Jan. Why setting votes=2 for cluster members ? It works fine for me with votes=1 .
Best regards,
Lokesh
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тАО02-08-2004 11:01 PM
тАО02-08-2004 11:01 PM
Re: Quorum Disk Failure
IF
1) node 1 is stopped with REMOVE_NODE
2) the quorum disk gets lost after 1) has completed
THEN
your cluster is still alive (because a minority of 1 vote left the cluster with total votes equal to 3, so 2 votes left).
If you have 1-1-1, the cluster would hang until the disk is replaced or the second node is rebooted.
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тАО02-09-2004 12:10 AM
тАО02-09-2004 12:10 AM
Re: Quorum Disk Failure
Indeed, that IS the reason to use 2-2-1.
Then the issue of SAN disconnecting/reconnecting disappears nearly completely: Only if one node left WITHOUT adjustment (eigther by crash or by operator forgetting "remove_node"), THEN if the SAN connection disappears BEFORE a SET CLUSTER/EXPECTED,only THEN will the hang still occur. Should be very rare.
Jan
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тАО02-09-2004 01:25 AM
тАО02-09-2004 01:25 AM
Re: Quorum Disk Failure
Thanks for explaning the advantage of 2-2-1 . I will note it down.
Best regards,
Lokesh