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тАО02-10-2006 11:34 PM
тАО02-10-2006 11:34 PM
Now during creating serviceguard config, for my FIRST_CLUSTER_LOCK_PV i have mentioned the primary path. suppose this path fails after configuration it will cause problem with cluster.
should i specify the alternative links of the same PVs or is not necessary. if necessary how can i do it?
Solved! Go to Solution.
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тАО02-11-2006 12:13 AM
тАО02-11-2006 12:13 AM
Solution# spmgr display
TGT/LUN Device
0/ 0 c16t0d0 <---------
Controller Path_Instance
xxxxxxxxxxxx
c10t0d1
c13t0d1
Controller Path_Instance
xxxxxxxxxxxx
c11t0d1
c12t0d1
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тАО02-11-2006 02:41 AM
тАО02-11-2006 02:41 AM
Re: PVlinks + cluster lock disk - service guard
Unless your cluster is architected in one of two specific ways, then a dual (or second) cluster lock disc is also unsupported
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тАО02-11-2006 02:49 AM
тАО02-11-2006 02:49 AM
Re: PVlinks + cluster lock disk - service guard
As we have to mention the device file of the disk and not the VG, on failure of the path the lock disk will not be accessible. In the event of any requirement to accessing the lock disk during this time will do everything what will happen if the disk is not available.
The best way will be to use secure path and it will make only one device file available from multiple paths. The second cluster disk is also not supported normally.
HTH,
Devender
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тАО02-11-2006 04:32 AM
тАО02-11-2006 04:32 AM
Re: PVlinks + cluster lock disk - service guard
but in EVA 4000 usual secure path is not supported. but only autopath (now included in secure path as active/active component). thats why i had to go for PV links.
now setting FIRST_CLUSTER_LOCK_PV is becoming problem.if u have any solution please let me know.
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тАО02-11-2006 04:48 AM
тАО02-11-2006 04:48 AM
Re: PVlinks + cluster lock disk - service guard
Autopath display : ---> gives only 4 active paths. it does create a single file like in usual secure path software.
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тАО02-11-2006 04:49 AM
тАО02-11-2006 04:49 AM
Re: PVlinks + cluster lock disk - service guard
I think you'd be better off with a cluster lock disk that is not accessible through multiple pathes.
I think actually even if its a two node cluster a quorom server is a better idea.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО02-11-2006 04:53 AM
тАО02-11-2006 04:53 AM
Re: PVlinks + cluster lock disk - service guard
but i can't go with quorum server. do u have any other solution.
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тАО02-11-2006 05:37 AM
тАО02-11-2006 05:37 AM
Re: PVlinks + cluster lock disk - service guard
Agree with SEP. That is the only wait out.
Regards,
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тАО02-11-2006 05:08 PM
тАО02-11-2006 05:08 PM
Re: PVlinks + cluster lock disk - service guard
The Active/Active EVAs will provide 4 paths for each LUN in a dual Fabric configuration, as you have mentioned.
So your query is indeed valid. I did a VCS 4.001 upgrade on a EVA5000 which put me in a similar situation. I have used the primary device file as the PV lock device. The host upgrade manual was mentioning about a migration tool which contained a script called "inquiry".This script is used to identify the device file for the cluster lock PV. But I could not get this migration tool for my upgrade and hence I did it manually. A response from HP guys here would be helpful.
But you need not worry about the cluster if the cluster lock disk fails. The cluster will keep functioning. the lock disk comes into picture only when a cluster arbitration is required. And then for cluster lock to fail there should be a LUN failure in EVA, which will happen only in case of 2 concurrent failures. This chance is less.
with regards,
Mohan.