Mirroring lvol spanned in two disks.

[sysadm_1]

i have two 18gb disks in vg00.Mirror disk/ux is installed.
I have a single lvol with size of 24GB which is spanned across these two disks.
Now i want to add two more 18Gb disks and want to mirror only this lvol.Can anybody tell how to mirror this lvol to new disks?

[Bill McNAMARA_1]

ioscan -fnkC disk

find the device files for the newly added disk.
/dev/dsk/cXtYd0

vgextend /dev/vg00 /dev/dsk/cXtYd0

I'm assuming the lvol in /dev/vg00/lvol1

lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/cXtYd0

lvdisplay -v /dev/vg00/lvol1 | more
to display mirror info.

Bill

[Bill McNAMARA_1]

sorry misread.

You're adding two disks:
use
vgextend /dev/vg00 /dev/dsk/cX2ty2d0
to add the second 18G disk to the vg00


I haven't got lvm mirror installed on my system, but believe there is a "-D y" option to distribute the mirror over two disks correctly.

I'll search for it in the forums and get back..

[Bill McNAMARA_1]

apparently mirroring your stripes is unsupported:

see:
http://forums1.itrc.hp.com/service/forums/parseCurl.do?CURL=%2Fcm%2FQuestionAnswer%2F1%2C%2C0xab4ca22831ebd5118ff40090279cd0f9%2C00.html&admit=716493758+1066481149320+28353475

see also:
http://forums1.itrc.hp.com/service/forums/parseCurl.do?CURL=%2Fcm%2FQuestionAnswer%2F1%2C%2C0x88a753921f1ad5118fef0090279cd0f9%2C00.html&admit=716493758+1066481009834+28353475

[Bill McNAMARA_1 · Accepted solution]

some more info:
http://forums1.itrc.hp.com/service/forums/parseCurl.do?CURL=%2Fcm%2FQuestionAnswer%2F1%2C%2C0x05ad6af52b04d5118fef0090279cd0f9%2C00.html&admit=716493758+1066481286004+28353475


and:
http://forums1.itrc.hp.com/service/forums/parseCurl.do?CURL=%2Fcm%2FQuestionAnswer%2F1%2C%2C0x6da8e3ed7640d71190080090279cd0f9%2C00.html&admit=716493758+1066481355651+28353475

[sysadm_1]

Hi Bill,
Here i am not using any type of striping
lvol1 is in two disk because lvol size is 24GB and single disk size is 18GB.
in this condition,commands
vgextend vg00 /dev/dsk/dsk1 /dev/dsk/dsk2
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/dsk1 /dev/dsk/dsk2
will it mirror lvol1 to dsk1 and dsk2??

[Zigor Buruaga]

Hi,

I think your commands will work fine, LVM will fill up the first disk ( 18 GB ) and then it will use the second disk ( 24 - 18 = 6 GB mirrored in the second disk ).
Anyway, you could try it and then check the result with "pvdisplay -v /dev/dsk/your_new_disks".

Kind regards,
Zigor