topic Re: Mirror Disk in Operating System - HP-UX

Mirror Disk

Ricky B. Nino — Tue, 25 Mar 2003 04:20:26 GMT

Hi,

How will I check if a given Disk in my system was configured as a mirror disk?

Thanks and regards...

Re: Mirror Disk

Michael Tully — Tue, 25 Mar 2003 04:25:47 GMT

Hi,

There is no direct method. You can do these procedures to check.

# vgdisplay -v /dev/vg00
From the output of this, grab say /dev/vg00/lvol4 and it will say how many used physical volumes "Used PV"

# lvdisplay -v /dev/vg00/lvol4
This will display the primary and secondary volumes for the logical volume. To confirm the disks in the volume group, check how many disks are in the volume group in the header of vgdisplay, and in the tail where each of the drives are listed.

Regards
Michael

Re: Mirror Disk

Sridhar Bhaskarla — Tue, 25 Mar 2003 04:29:38 GMT

Hi,

If you are asking about boot disk, then you would do the following

1. lvlnboot -v

Look for two boot disks. The boot, root, swap logical volumes should show both the disks.

2. Do a lifls /dev/dsk/cxtydz and it should print out the LIF information

3. lifcp /dev/dsk/cxtydz:AUTO -
should print the contents of AUTO file

4. Do an "lvdisplay -v /dev/vg00/lvolx" for all the logical volumes. The output should show the disks on which it is mirrored. Also in the lvdisplay output, you should "Mirror Copies" line.

For non-bootable disks, you need to do 'lvdisplay -v /dev/vgxx/lvolx' to find if the lvols are mirrored. To get the list of lvols on the system, do

vgdisplay -v |grep "LV Name" |awk '{print $3}'

-Sri

Re: Mirror Disk

T G Manikandan — Tue, 25 Mar 2003 06:17:37 GMT

If you are using MirrorUX
Mirroring is implemented at the logical volume level
So just do a

lvdisplay -v lvol_name

check for the output for the field "Mirror copies" which should have a non-zero value.

Re: Mirror Disk

Trond Haugen — Tue, 25 Mar 2003 06:55:20 GMT

It is not the disks as such that are mirrored, but the lvols. If you want to check if a lvol is mirroed run 'lvdisplay /dev/vgxx/lvoly' and check if 'Mirror copies' is greater than 0. If you want to know which disks the lvol resides on run 'lvdisplay -v /dev/vgxx/lvoly | more'.

Regards,
Trond

Re: Mirror Disk

Sunil Sharma_1 — Tue, 25 Mar 2003 07:12:56 GMT

Hi,

As other guys comments there is no mirroring on disk level in HP unix, it's logical volumes based mirroring.
but if you want to find out disk is containing any mirrored volume then first you have to find out which volumes are using that disk with command.
pvdisplay -v /dev/dsk/cxtydz

it will give you details about disk used by LVM.
then you can see wheather volumes belong to that disks are mirrored or not using
lvdisplay -v /dev/vgXX/lvolYY

in out put of above command it will show physical/logical extent allocation if any volume is mirrored then in o/p you will get 2 physical extents map to one logical extent.

Regards
Sunil