increase size of mirrored filesystem

[Peter Gillis]

hi again,
hpux 11.00 on RP2470 machine.
I need to increase size of mirrored filesystem on vg00 to 5GB.
I know I have to:
lvextend -L5000 /dev/vg00/lvabc
umount /dev/vg00/lvabc
extendfs /dev/vg00/rlvabc
mount /dev/vg00/lvabc /mybiggerfilessytem

BUT, what about the mirror part of it?

Thanks for your help,
points awarded soon...
Maria.

[sekar parthasarathy]

Hi,

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x4ef5c6af36b7d5118ff10090279cd0f9,00.html


Regards

Sekar.

[Jeff Schussele · Accepted solution]

Hi Maria,

Three things:

1) Understand that the extension would only be possible IF the VG has 10000M free.

2) IF you have Strict Allocation set - which IS the default - then you MUST have 5000M free on EACH PV or it'll fail. Trust me - this IS for your own good.

3) If you have On-Line JFS then no umount is needed. And...you should have it. Absolutely mandatory in a Production env today. Customers don't care just *why* you're having an outage - they just know they're pissed because of it.

My $0.02,
Jeff

[Michael Tully]

Hi Maria,

Your procedure is fine as long as you can unmount the filesystem and have you sufficient disk space (on both disks) in which to do the extension.
If you have online JFS there is no need to unmount the filsystem at all. This all depends on the filesystem being changed. If it is / or /stand, then you cannot do it at all unless you use the "booting of ignite tape method".
The mirror extension will be done when you do the 'lvextend' part. It will know that it is mirrored and do it automatically. AGain this depends on the amount of space required and which filesystem it is.

Regards
Michael
"When I have trouble spelling, it's called fat finger syndrome"

[steven Burgess_2]

Hi Maria

It's the same as extending a non mirrored volume apart from adding the volume names to your command. If your allocation ploicy is set to strict you need to ensure you have enough space on both devices

# lvextend -L 5000 /dev/vg05/lvabc /dev/dsk/cAtAdA /dev/dsk/cBtBdB

HTH

Steve

[V.Tamilvanan]

Hi,
If u need to extend an one way mirrored LV u must have double the size of your actual size to be increased.
Unless u don't have double the size ur lvextend will fail.
Again the free PEs should be in the proper PVs depends upon your allocation policy.
- hth.
Tamil

[Con O'Kelly]

Hi

Jeff has covered everything. The only thing I'd point out is if you are trying to extend root or stand LV's then it won't be possible as they need to be contiguous.

You'll also have a hard time with alot of the FS's (/var, /usr etc) in the root VG if you don't have online JFS as they are difficult to unmount due to the number of processes accessing them.


Cheers
Con

[Jeff Schussele]

Hi Maria & Con,

Don't forget Primary swap - that makes the trifecta for - It ain't gonna happen w/o Ignite."

Cheers,
Jeff