Cannot Add alternate PV to a VG

[singh sanjeev]

can you see any scsimgr error in syslog.??

[chris huys_4]

Hi Tuck,

Deinstall powerpath and try again. In the past powerpath was not supported on HP-UX 11.31, so could be a reason for youre strange results..

Greetz,
Chris

[Tuck Lee]

Hi All,

What does all this means? if I have dual path in my server link to the DMX or clariion, in the DSF description i should see only one disk like "/dev/disk/disk65" only and no second disk link like in the lageacy lvm?

[R.O.]

Why don't you use the native multipathing with agile name convention instead of powerpath? I thought with native multipathing you could forget third party applications.

[Torsten.]

As long as the legacy device files are still enabled (disable them with rmsf, see man page), you still see 1 new device file and several legacy (one for each path).

[RC Park]

According to the documentation I have, there should no longer be any need for 3rd-party apps doing any multi-pathing. I've attached another document on this subject but here's a quote:

Multi-pathing is native to HP-UX 11i v3. It is built in to the mass storage subsystem and it is available to applications without any special configuration. Pre-11i v3 multi-pathing add-on products are no longer necessary on HP-UX 11i v3.
Native multi-pathing offers the following features:
â ¢
optimal distribution of I/O traffic across lunpaths to LUNs,
â ¢
dynamic discovery of lunpaths and LUNs,
â ¢
automatic monitoring of lunpaths,
â ¢
automatic lunpath failover and recovery,
â ¢
intelligent I/O retry algorithms to deal with failed lunpaths,
â ¢
lunpath authentication to avoid data corruption.

The attached document describes native multi-pathing in detail including examples. Hope this helps...

RCP

[Tuck Lee]

Hi All got some new information to share

# vgextend /dev/vg01 /dev/dsk/c19t8d1
Verification of unique LVM disk id on each disk in the volume group
/dev/vg01 failed.
Following are the sets of disks having identical LVM disk id
/dev/dsk/c15t8d1 /dev/dsk/c19t8d1

== > This is the known issue with EMC storage firmware.
== > Refer the below document for the reference.

--------------------------------------------
HP-UX 11.31 - LVM: vgextend Fails with "Verification of unique LVM disk id on each disk in the volume group failed"
ISSUE:
I created a volume group using persistent device files, but I cannot vgextend the alternate links into the volume group. The following error message is received:


# vgextend /dev/vg02 /dev/dsk/c8t0d5 /dev/dsk/c8t0d6 /dev/dsk/c8t0d7 /dev/dsk/c8t1d0
Verification of unique LVM disk id on each disk in the volume group /dev/vg02 failed.
Following are the sets of disks having identical LVM disk id
/dev/dsk/c6t0d5 /dev/dsk/c8t0d5
/dev/dsk/c6t0d6 /dev/dsk/c8t0d6
/dev/dsk/c6t0d7 /dev/dsk/c8t0d7
/dev/dsk/c6t1d0 /dev/dsk/c8t1d0



What is the source of this error? How do I correct it?

CONFIGURATION:
HP-UX 11.31
Storage array: EMC

SOLUTION:
Investigation of the error identified that the error message was due to a the version of firmware on the array.

Footnote 2 on page 7762 of the document titled EMC Support Matrix states the following:

"SPC-2 is required on Symmetrix FA director for HP-UX 11i v3

Check for:
SPC protocol revision = 4 .
If the revision is 2, the DMX SPC needs to have a firmware upgrade.

After upgrading the firmware (requires EMC assistance), the problem was resolved.

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