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identifying the raid

 
newunix
Frequent Advisor

identifying the raid

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.
4 REPLIES
Johnson Punniyalingam
Honored Contributor

Re: identifying the raid

>>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"
Problems are common to all, but attitude makes the difference
Johnson Punniyalingam
Honored Contributor

Re: identifying the raid

RAID concept explained below thread.

http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1266133494488+28353475&threadId=1370405
Problems are common to all, but attitude makes the difference
Torsten.
Acclaimed Contributor

Re: identifying the raid

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

Hope this helps!
Regards
Torsten.

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Michael Steele_2
Honored Contributor

Re: identifying the raid

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?
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