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тАО06-20-2005 05:24 AM
тАО06-20-2005 05:24 AM
VG deactivation for temporary disc maintenance?
system with failing cache battery pack.
A single VG owns all PVs from the RAID. HP-UX host connection is via an A6829A, dual channel HBA.
If I succeed in running vgchange -a N ; to
de-activate this VG, can I then shutdown my RAID, for battery replacement, without
disturbance (SCSI timeouts etc) to the running host.
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тАО06-20-2005 05:37 AM
тАО06-20-2005 05:37 AM
Re: VG deactivation for temporary disc maintenance?
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тАО06-20-2005 05:42 AM
тАО06-20-2005 05:42 AM
Re: VG deactivation for temporary disc maintenance?
Do the umount 1st
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тАО06-20-2005 07:45 AM
тАО06-20-2005 07:45 AM
Re: VG deactivation for temporary disc maintenance?
Having to shutdown for routine tasks is something I avoid but it may be the safer option; however, any array that requires shutdown for this task can hardly be considered a highly-available device.
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тАО06-20-2005 09:57 PM
тАО06-20-2005 09:57 PM
Re: VG deactivation for temporary disc maintenance?
(Infortrend) controllers in DPs 7000
series enclosures - we don't have
this set-up, yet.
No applications are currently using this
RAID; but services would be affected by host shutdown.
So my question about LVM is
does it, in any way, generate I/O to
the PVs of a de-activated VG..
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тАО06-20-2005 10:12 PM
тАО06-20-2005 10:12 PM
Re: VG deactivation for temporary disc maintenance?
Once VG is deactivated there will not be any IO to this disks. But if you try to access disks by other means like via dd , diskinfo or vgscan etc. then surely system will try to access disks.
HTH,
Devender
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тАО06-21-2005 02:31 AM
тАО06-21-2005 02:31 AM
Re: VG deactivation for temporary disc maintenance?
hoped would be the LVM behaviour.