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тАО11-01-2005 08:41 PM
тАО11-01-2005 08:41 PM
Activating volume group takes long time
i have a problem with my volume groups on my two node mc service guard cluster.
The nodes are connected to a EMC SAN. Last week, the SAN has changed from a symmetrix to a clarion system. We got additional disk space, so i extended our volume groups. We have five volume groups, each has roundabout 1 TB. We have JFS, so i used fsadm to increase the size of my filesystems.
Since that modifications, activation of the volume groups take very long.
When i do a vgchange -a r /dev/vgxx, it takes roundabout 5 minutes until a vg is activated. When i deactivate a volume group and activate it again, its fast, until the next reboot of the server. After the reboot, activation takes 5 minutes per vg again.
My OS is HP-UX 11.23.
Does anybody has an idea what the problem could be.
Many thanks for your help!
Christoph
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тАО11-01-2005 09:07 PM
тАО11-01-2005 09:07 PM
Re: Activating volume group takes long time
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тАО11-01-2005 09:12 PM
тАО11-01-2005 09:12 PM
Re: Activating volume group takes long time
Check your volume groups with "vgdisplay -v
(Last time we did a SAN migration, one common mistake was forgetting to remove all the old disconnected paths from the configuration. No damage, but cleaning things up took a while.)
If there are several paths to a PV and the first listed path is not connected, the LVM system will switch to an alternate path after a while. From that point on until next reboot, it remembers that one path is down and prefers the working ones. If there are a lot of PVs in a volume group, the activation may indeed take a while.
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тАО11-01-2005 09:53 PM
тАО11-01-2005 09:53 PM
Re: Activating volume group takes long time
There are alternate paths visible to the system, but they are not configured into the volume groups, because we have host based mirrors.
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тАО11-02-2005 02:39 PM
тАО11-02-2005 02:39 PM
Re: Activating volume group takes long time
It sounds like the path [device file]you have in the vg is not the default owner as configured in powerpath. When you activate the vg and it tries to access the LUN through the path defined in the VG, powerpath has to flip the ownership of that LUN which takes a little time.
The second time you active the vg all the ownerships are already correct. When you reboot and restart powerpath all the ownership revert back to the default state.
At least that's my guess.
try the command 'powermt display all' before activating the VG and then compare the active paths to the ones in the vg.
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тАО11-03-2005 04:27 AM
тАО11-03-2005 04:27 AM
Re: Activating volume group takes long time
Thank you all for your help.