mirror problem

[Cathy Arora]

I was trying to mirror disk and tried to create physical colume and I got an error
any help will be appreciated.
also I would like to know how to work with vgexport?

# pvcreate -B /dev/rdsk/c0t5d0
Couldn't stat physical volume "/dev/rdsk/c0t5d0":
Physical volume can be created only on whole disk.

Thanks,

[Jeff Schussele]

Hi Cathy,

Do an
ioscan -fnC disk
and verify that c0t5d0 is indeed the disk device you're trying to use for the mirror.
It must say CLAIMED if it's an available, working disk.

Rgds,
Jeff

[Cathy Arora]

Thanks but it claiamed and avaialble.

[Paula J Frazer-Campbell]

Hi

This may help:-

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=240333

If you search the forum you will find many ways to use vgexport.

Paula

[Uday_S_Ankolekar]

Is c2t5d0 is disk shows up ioscan -fnc disk ?

Try using pvcreate -fB option

And here is the process to create mirrored boot disk.
pvcreate -fB /dev/rdsk/c0t5d0;
vgextend /dev/vg00 /dev/dsk/c0t5d0,
mkboot -l /dev/rdsk/c0t5d0, mkboot -a "hpux" /dev/rdsk/c0t5d0,
mkboot -a "hpux -lq" /dev/rdsk/c0t5d0,
lifcp /dev/rdsk/c0t5d0:AUTO -;
setboot -a (From IOSCAN for that disk),
Mirroring can be done by this
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c0t5d0
and rest of the lvols in vg00 ,
lvlnboot -b /dev/vg00/lvol1 /dev/vg00, lvlnboot -s /dev/vg00/lvol2 /dev/vg00, lvlnboot -d /dev/vg00/lvol2 /dev/vg00, lvlnboot -r /dev/vg00/lvol3 /dev/vg00

Goodluck,
-USA..

[Karthik S S]

Is it a internal harddisk or external box?? One of the earlier posting states that the low level LVM configuration on older model of diskarrays needs to performed through SAM.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=240333

vgexport is used for removing the VG configuration from the system. It is different from vgremove. vgremove as the name suggests removes the data but vgexport only removes the entries for the particular VG that you are exporting from the following locations,

/etc/lvmtab (removes the entry for vgxx)
/dev/vgxx (removes the whole directory)

You can also export the configuration to a MAP file so that you can either import the disk back in the same system or on a different system.

vgexport -v -m /tmp/vgxx.map vgxx

to import
1. mkdir /dev/vgxx; cd /dev/vgxx
2. mknod group c 64 0x0n0000 ( the value of "n" should not conflict with other VGs in the system)
vgimport -v -m /tmp/vgxx.map vgxx /dev/dsk/cxtxdx

This is especially useful in Serviceguard cluster configuration.

-Karthik S S

[Karthik S S]

Hi Paula,

Mirror is in sync between our search engines again ;-)

-Karthik S S
No points for this please.

[Paula J Frazer-Campbell]

Karthik

I was first this time ;^)



Paula

[Cathy Arora]

Hi Karthis;
everythig was going fine unitl this point please explain which option to choose and why
mkboot -a or lq or -l. Thanks
I have only two disks

[Cathy Arora]

My apology for misspelling your name karthik.

[Uday_S_Ankolekar]

You will have to run mkboot -a and mkboot -l both commands where mkboot -a is twice.

mkboot -l /dev/rdsk/c0t5d0,
mkboot -a "hpux" /dev/rdsk/c0t5d0
mkboot -a "hpux -lq" /dev/rdsk/c0t5d0,

[Karthik S S]

Refer this notes,

http://www.wagoneers.com/UNIX/HP-UX/older-HP-info/MirrorRootDisks.html

-Karthik S S

[Cathy Arora]

why twice?

[Uday_S_Ankolekar]

If you are refering to my reply then the answer for "why twice" is

mkboot -l will place boot utilities in boot area for that disk
mkboot -a "hpux" will put an AUTO file in boot LIF area

mkboot a "hpux -lq" When root colume group contains two disks allwing the system to boot in the event that one disk is unavailable , resulting loss of quorum.

-USA..

[Cathy Arora]

Thanks Uday, yes I was reffering to your reply but addressing to wrong name as well.