topic Disk Mirroring. in Operating System - HP-UX

Disk Mirroring.

sagi_1 — Wed, 06 Jan 2010 15:38:34 GMT

Hi,

I am not able to boot the server using the primary disk. Hence, the disk has been removed physically and the server was booted using the secondary disk.
Now, i need to sync the primary disk back.
Please help me with the below queries when i insert the same disk which was removed earlier:

1) Will it be start automatic disk synching with primary ?

2) Any data loss on the secondary disk

3) Procedure to replace the Primary disk and synching with the secondary disk

Regards,
Sagar.

Re: Disk Mirroring.

James R. Ferguson — Wed, 06 Jan 2010 15:44:20 GMT

Hi Sagar:

See:

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad_WP.pdf

There are slightly different procedures for PA-RISC versus Itanium servers. Pay attention.

Regards!

...JRF...

Re: Disk Mirroring.

sagi_1 — Wed, 06 Jan 2010 15:52:33 GMT

Hi James,

Thanks for the responce. The document doesnt deal with this scenario. Th eproblem i am facing is all my LV's in VG00 are in stale condition as lvreduce was not done before removing teh disk physiaclly.
I wonder if teh server starts the disk sysncing as soon as i insert the new disk and are there any problems or data loss that i may face due to this.

Thanks,
Sagar.

Re: Disk Mirroring.

Michal Kapalka (mikap) — Wed, 06 Jan 2010 16:00:49 GMT

hi sagi,

at first you should be able to send more info.

Itanium or Pa-risc server ???

because the procesdures are different

mikap

Re: Disk Mirroring.

sagi_1 — Wed, 06 Jan 2010 16:11:38 GMT

The server is a itanium server. Model is rx2620
Below are furtehr details:

# lvlnboot -v
lvlnboot: Couldn't query physical volume "/dev/dsk/c2t0d0s2":
The specified path does not correspond to physical volume attached to
this volume group
# lvdisplay /dev/vg00/lvol3
lvdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0s2":
The specified path does not correspond to physical volume attached to
this volume group
lvdisplay: Warning: couldn't query all of the physical volumes.
--- Logical volumes ---
LV Name /dev/vg00/lvol3
VG Name /dev/vg00
LV Permission read/write
LV Status available/stale
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 1024
Current LE 64
Allocated PE 128
Stripes 0
Stripe Size (Kbytes) 0
Bad block off
Allocation strict/contiguous
IO Timeout (Seconds) default

Re: Disk Mirroring.

Michal Kapalka (mikap) — Wed, 06 Jan 2010 16:18:50 GMT

hi,

that is a integrity server,

so you should use the recomended link from "James" its a very good doc.

mikap

Re: Disk Mirroring.

R.K. # — Wed, 06 Jan 2010 16:23:19 GMT

Hi Saqi,

>> Now, i need to sync the primary disk back.
Is this a new disk? The earlier disk may be bad.

If the disk is hot swappable, you can plug it while server is running.
After that, do "vgcfgrestore" on this (new) disk. (you may require "pvchange" to enable the disk for IO).
Then do,
- reactivate (vgchange -a y vg00)
or
- vgsync vg00
or
- lvsync

Any one one of above should sync the pri disk to the secondary disk.

No data loss as far as sec disk is good.