I/O requests - performance issue

[Tux_1]

below given error's are occurring on the HP-UX host end during I/O happening.
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Sep 28 06:28:21 server01 vmunix: waiting indefinitely for an unavailable PV have now completed.
Sep 28 06:28:43 server01 vmunix: LVM: WARNING: VG 64 0x100000: LV 2: Some I/O requests to this LV are waiting
Sep 28 06:28:43 server01 vmunix: indefinitely for an unavailable PV. These requests will be queued until
Sep 28 06:28:43 server01 vmunix: the PV becomes available (or a timeout is specified for the LV).
Sep 28 06:28:43 server01 vmunix: LVM: NOTICE: VG 64 0x100000: LV 2: All I/O requests to this LV that were
Sep 28 06:28:43 server01 vmunix: waiting indefinitely for an unavailable PV have now completed.
Sep 28 06:29:35 server01 vmunix: class : lunpath, instance 409
Sep 28 06:29:35 server01 vmunix: Asynchronous write failed on LUN (dev=0x300008c)
Sep 28 06:29:35 server01 vmunix: IO details : blkno : 383, sector no : 766
Sep 28 06:29:59 server01 vmunix: LVM: WARNING: VG 64 0x100000: LV 2: Some I/O requests to this LV are waiting
Sep 28 06:29:59 server01 vmunix: indefinitely for an unavailable PV. These requests will be queued until
Sep 28 06:29:59 server01 vmunix: the PV becomes available (or a timeout is specified for the LV).
Sep 28 06:30:04 server01 vmunix: LVM: NOTICE: VG 64 0x100000: LV 2: All I/O requests to this LV that were
Sep 28 06:30:04 server01 vmunix: waiting indefinitely for an unavailable PV have now completed.
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[merieux]

Hi ,

can you give us more details ?

Is this errror appear only one time ?

Which is the corresponding VG , do you have identify which disk/lun is impacted ?

[S. Ney]

Please provide more details like what kind of storage you are attached to, OS level (11.23, 11.31, etc), volume group information (vgdisplay -v vgname)

[Kevin Lister]

Howdy,

Do you by any chance have multiple paths to the storage device set up in your Volume Groups?

If so, make sure that the Volume Groups are set up with the primary paths to the storage are the "performance" paths and the alternate paths are set up as the secondary "non-performance" paths.

Also, what is the pvtimeout setting on the physical volumes?

kev