topic Re: Failed disk, split the mirrors? in Operating System - HP-UX

Failed disk, split the mirrors?

dictum9 — Sat, 21 Mar 2009 11:31:25 GMT

The box is 5670 running 11.23.

I have a failed disk, internally.
I want to split the mirrors, I assume it won't affect uptime?

Second question, are the internal disks hot-swappable in 5670?

vgdisplay -v /dev/vg00

(.....)

--- Physical volumes ---
PV Name /dev/dsk/c0t0d0s2
PV Status available
Total PE 4228
Free PE 161
Autoswitch On
Proactive Polling On

PV Name /dev/dsk/c0t2d0s2
PV Status unavailable
Total PE 4228
Free PE 697
Autoswitch On
Proactive Polling On

Re: Failed disk, split the mirrors?

dictum9 — Sat, 21 Mar 2009 11:34:15 GMT

vgdisplay -v vg00

--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 13
Open LV 13
Max PV 16
Cur PV 2
Act PV 2
Max PE per PV 4238
VGDA 4
PE Size (Mbytes) 8
Total PE 8456
Alloc PE 7598
Free PE 858
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

--- Logical volumes ---
LV Name /dev/vg00/lvol1
LV Status available/stale
LV Size (Mbytes) 304
Current LE 38
Allocated PE 76
Used PV 2

LV Name /dev/vg00/lvol2
LV Status available/syncd
LV Size (Mbytes) 4096
Current LE 512
Allocated PE 1024
Used PV 2

LV Name /dev/vg00/lvol3
LV Status available/stale
LV Size (Mbytes) 400
Current LE 50
Allocated PE 100
Used PV 2

LV Name /dev/vg00/lvol4
LV Status available/stale
LV Size (Mbytes) 600
Current LE 75
Allocated PE 150
Used PV 2

LV Name /dev/vg00/lvol5
LV Status available/stale
LV Size (Mbytes) 24
Current LE 3
Allocated PE 6
Used PV 2

Re: Failed disk, split the mirrors?

dictum9 — Sat, 21 Mar 2009 11:36:32 GMT

#: ioscan -fnC disk|head -40
Class I H/W Path Driver S/W State H/W Type Description
==========================================================================
disk 0 0/0/2/0.0.0 sdisk CLAIMED DEVICE HP 36.4GST336753LC
/dev/dsk/c0t0d0 /dev/dsk/c0t0d0s2 /dev/rdsk/c0t0d0 /dev/rdsk/c0t0d0s2
/dev/dsk/c0t0d0s1 /dev/dsk/c0t0d0s3 /dev/rdsk/c0t0d0s1 /dev/rdsk/c0t0d0s3
disk 1 0/0/2/0.2.0 sdisk CLAIMED DEVICE HP 36.4GST336753LC
/dev/dsk/c0t2d0 /dev/dsk/c0t2d0s2 /dev/rdsk/c0t2d0 /dev/rdsk/c0t2d0s2
/dev/dsk/c0t2d0s1 /dev/dsk/c0t2d0s3 /dev/rdsk/c0t2d0s1 /dev/rdsk/c0t2d0s3
disk 2 0/0/2/1.3.0 sdisk CLAIMED DEVICE HP DVD-ROM 305
/dev/dsk/c1t3d0 /dev/insf13392 /dev/rdsk/c1t3d0

Re: Failed disk, split the mirrors?

dictum9 — Sat, 21 Mar 2009 11:36:55 GMT

Re: Failed disk, split the mirrors?

Aneesh Mohan — Sat, 21 Mar 2009 11:51:04 GMT

1) I have a failed disk, internally.
I want to split the mirrors, I assume it won't affect uptime?

See the below doc.
http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad_WP.pdf

2)
The Internal HDD`s are hot plugable

rx 5670 specs
http://h18004.www1.hp.com/products/quickspecs/11719_div/11719_div.HTML

Thanks,
Aneesh

Re: Failed disk, split the mirrors?

dictum9 — Sat, 21 Mar 2009 14:18:29 GMT

Thanks for the link.

Re: Failed disk, split the mirrors?

sujit kumar singh — Sat, 21 Mar 2009 18:15:21 GMT

Hi

Try doing

for i in /dev/vg00/lvol*
>do
>lvreduce -m 0 $i /dev/dsk/c0t2d0s2
>done

and follow that with

#vgreduce -f /dev/vg00

If you do like this rememeber that you will need to put in the new disk when that arrives and create the idisk partitions on that and do a remirror of all the LVs all over again.

but that is a cleaner approach.

the deletion od the disks as well as putting in the new disk and remirroring wont require any downtime.
regards
sujit

Re: Failed disk, split the mirrors?

Emil Velez — Sun, 22 Mar 2009 01:39:13 GMT

I would follow the cookbook in the when good disks go bad and replace the failed disk and rebuild the mirroring instead of breaking the mirroring.

Re: Failed disk, split the mirrors?

dictum9 — Mon, 23 Mar 2009 20:25:52 GMT

I just realized the disks are not perfectly mirrored, not 1:1 correlation in lvols.

mirror disk has some swap partitions that primary does not not have. Impossible to replace without downtime.

They are both 36GB, I will do some work and replace them with 72GB.

Re: Failed disk, split the mirrors?

Torsten. — Tue, 24 Mar 2009 03:33:40 GMT

"mirror disk has some swap partitions that primary does not not have. Impossible to replace without downtime. "

Probably, but the disk is already "unavailable" - you need to check this and follow the WP document.

A 72GB disk will not fit into your current configuration:

Max PE per PV 4238
PE Size (Mbytes) 8

Consider to use ignite to restore the vg with new maximum values.

Re: Failed disk, split the mirrors?

Suraj K Sankari — Tue, 24 Mar 2009 03:51:47 GMT

Hi,

For disk related issue (change bad disk ) always refer this doc.

Suraj