How to tell if disks are mirrored or not?

[Gino Castoldi_2]

Hi,

Our system is HP-UX 11.11, 2 - 36GB disks (VG00) (internal), VxVM 3.5 (can't tell if it's the base version or not), VxFS/OnlineJFS.

How can we tell if the two boot disks are mirrored or not?

10 points to any good answer.
Thank you
Gino

[Mark Grant · Accepted solution]

You don't actually mirror the disks, you mirror the logical volumes so look for a "Mirors" greater than 0 when you do "lvdisplay /dev/vg00/lvol1" etc.

[Bernhard Mueller]

For internal disks with LVM mirroring and more or less default lvol naming simply do:
# for i in /dev/vg00/lv* ; do
> lvdisplay $i | grep "Mirror"
> done
#

[Mark Greene_1]

More importantly, you want to know if the second disk is actually bootable. Run lvlnboot -v to find out.

mark

[Michael Schulte zur Sur]

Hi Gino,

start sam, select disk and file systems, select logical volumes and that shows you, how many mirror copies there are.

greetings,

Michael

[DIPAK KUMAR ROY]

Use "vgdisplay -v /dev/vg00" and see
1. if all logical volumes are using 2 Pvs. look for Used PV.
2. for all logical volumes the "Current LE" is half of "Allocated PE"

For example:

LV Name /dev/vg00/lvol9
LV status available/syncd
LV Size (Mbytes) 1024
Current LE 256
Allocated PE 512
Used PV 2


Thanks
Dipak

[Steven E. Protter]

lvlnboot -v works on my vxvm captable system.

does pvdisplay really work on a vxvm volume?

It should, its not a lvm specific command I guess.

SEP

[Helen French]

You can check it through:

# lvlnboot -v
# lvdisplay -v /dev/vg00/lvol1 (check for lvol2, lvol3 etc)

Also to see if Mirror/UX is present:

# swlist

[Jean-Louis Phelix]

Hi,

Perhaps one important question is missing ... Are you using VxVM also for your boot disk or root dg ? I think that it can be done with VxVM 3.5.

Regards

[Gino Castoldi_2]

Hi Jead-Louis,

I am not sure if VxVM (Volume Mgmr) is managing the boot disk or not. How do I tell?

10 points to any good answer.
Thank you
Gino

[DIPAK KUMAR ROY]

Try these commands...

1. vxprint -htg rootdg

2. vgdisplay -v /dev/vg00

If #1 command displays information about your rootdg then you are using VXVM.

If #2 command displays information about your vg00 then you are using LVM.

Thanks

[Mark Grant]

Gino,

Your original post mentions (vg00) which is why I assumed you were using LVM and not VxVM

[Helen French]

If the LVM commands (vgdisplay, lvdisplay) worked on your root VG (vg00), then you are using LVM. Vxvm uses seperate commands for it's operation. You can also check the /etc/fstab and /etc/inittab files.

[Gino Castoldi_2]

Hi,

vgdisplay /dev/vg00 lists LVM information so
I should assume that LVM is managing the
boot disk(vg00), and not VxVM?
(Cur/Act PV 2).


10 points to any good answer.
Thank you
Gino

[Mark Grant]

Yes Gino, you can safely assume that :)

[Tim Sanko]

Gino,

The root volume is mirrored with MirrorDisk/UX (in case you didn't know).

Unless you are doing some really fancy things, the Online JFS is nice, but I personally prefer symmetrix disks...

Are the disks managed by LVM, well if the disk lvol is vg00 (found by mount,bdf,etc...)
then yes the boot volume is controlled by LVM not by OnlineJFS.

The next Question to be answered is how do I reallocate the mentioned boot volume?

The answer is , Use IgniteUX. Download it and the latest PAX patch. If you have a dds2-3 on the server, do a make_tape_recovery -Av. Otherwise you need to set up an ignite server. Then set up a remote recovery after booting from the install CD...

Tim