topic Re: Lun Health in Operating System - HP-UX

Lun Health

AZayed — Wed, 09 Jun 2010 14:03:36 GMT

Dears,
Good day,

I start using HP-UX 11i v3 and I created multiple LUNs on my EVA. I have now an issue when firing the following command :

# ioscan -P health -C disk
Class I H/W Path health
===============================
disk 2 64000/0xfa00/0x0 online
disk 3 64000/0xfa00/0x1 online
disk 5 64000/0xfa00/0x2 online
disk 14 64000/0xfa00/0x15 limited
disk 16 64000/0xfa00/0x16 limited
disk 20 64000/0xfa00/0x17 limited
disk 31 64000/0xfa00/0x18 limited
disk 36 64000/0xfa00/0x19 limited

It report some LUNs as Limited. However, I converted my LVM to use New DSF format. How can I be sure that I don't have any issue with the multi-pathing

# lvmadm -l
--- Version 1.0 volume groups ---
VG Name /dev/vg00
PV Name /dev/disk/disk2_p2
/dev/dsk/c0t1d0s2

VG Name /dev/vgEBSAPPS
PV Name /dev/disk/disk14
/dev/dsk/c16t0d1
/dev/dsk/c18t0d1
/dev/dsk/c20t0d1
/dev/dsk/c14t0d1

VG Name /dev/vgEBSARC
PV Name /dev/disk/disk16
/dev/dsk/c16t0d2
/dev/dsk/c18t0d2
/dev/dsk/c20t0d2
/dev/dsk/c14t0d2

VG Name /dev/vgEBSDB
PV Name /dev/disk/disk20
/dev/dsk/c16t0d3
/dev/dsk/c18t0d3
/dev/dsk/c14t0d3
/dev/dsk/c20t0d3

VG Name /dev/vgSHARE
PV Name /dev/disk/disk31
/dev/dsk/c16t0d4
/dev/dsk/c20t0d4
/dev/dsk/c18t0d4
/dev/dsk/c14t0d4

VG Name /dev/vgBACKUP
PV Name /dev/disk/disk36
/dev/dsk/c16t0d5
/dev/dsk/c18t0d5
/dev/dsk/c14t0d5
/dev/dsk/c20t0d5

Thanks a lot.

Re: Lun Health

AZayed — Wed, 09 Jun 2010 14:12:49 GMT

I'm checking the paths I have e.g. the following paths disabled :

0/7/0/0/0/0.0x50001fe15010f0cc.0x5000000000000
0/7/0/0/0/0.0x50001fe15010f0c8.0x5000000000000
0/7/0/0/0/1.0x50001fe15010f0cd.0x5000000000000
0/7/0/0/0/1.0x50001fe15010f0c9.0x5000000000000

How can I know what's the problem ?

Re: Lun Health

Mancboy — Mon, 14 Jun 2010 13:31:22 GMT

Hi,
what does evainfo -l -d /dev/disk/disk36 come up with?
Also, what does ioscan -F -m dsf /dev/disk/disk36 come up with?

You should really be using LVM v2.1 or greater, this gives better multi-pathing.

Re: Lun Health

S. Ney — Mon, 14 Jun 2010 15:08:36 GMT

what do various scsimgr commands reveal on your limited disks?
scsimgr lun_map -D
scsimgr get_info -D

Attached is mass storage multipath document

Re: Lun Health

AZayed — Thu, 17 Jun 2010 14:19:42 GMT

Thanks folks,
It was a problem with the old paths.

Thanks