topic Re: identifying the raid in Operating System - HP-UX

identifying the raid

newunix — Sun, 14 Feb 2010 06:19:47 GMT

we are using raid1 and raid 5 for allocating pv to vg, now we need to extend the file system. so now i need to find in which raid configuration the particular vg was used before and as well as in which disk group it was allocated...

how to find that.

Re: identifying the raid

Johnson Punniyalingam — Sun, 14 Feb 2010 07:24:07 GMT

>>we are using raid1 and raid 5 for allocating pv to vg,<<

well i understand are you refering from "Storage side" ?? Not from Server side

>>now we need to extend the file system. <<

# vgdisplay /dev/vgname -> from output (look for Free PE * PE Size = unused space or free space)
then
# lvextend -L /dev/vgname/lvolname
# fsadm -F vxfs -b M /File_System_name

(man vgdisplay , lvextend) -> for examples

>>so now i need to find in which raid configuration the particular vg was used before and as well as in which disk group it was allocated...<<

depends on which storage your using talking about (intenal / External ) ? XP,EMC,EVA ?? they have their own commands for finding
Better you need to find form your "Storage Team" / Storage Admin "rais configuration of that "particular vg"

Re: identifying the raid

Johnson Punniyalingam — Sun, 14 Feb 2010 07:51:41 GMT

RAID concept explained below thread.

http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1266133494488+28353475&threadId=1370405

Re: identifying the raid

Torsten. — Sun, 14 Feb 2010 17:17:51 GMT

This really depends on your storage device - what is it?

Re: identifying the raid

Michael Steele_2 — Sun, 14 Feb 2010 20:24:25 GMT

Hi

In LVM there is only raid 0 (* striping *) and raid 1 ( mirroring ) - raid 5 will be on a disk array.

To check to see if you have raid 1 in LVM, use :

lvdisplay /dev/vg##/lvol#

...and refer to the 'mirrored copied' data field. 0 = no mirrors. 1 = one mirror and most common. 2 = 2 mirrors most often used now for data migrations since you can perform the migration online.

Question: What is your disk array?