extend a file system on an Autoraid disk array question.

[Gino Castoldi_2]

Hi,

HP-UX 11.0 JFS 3.1 (not online jfs) Autoraid
disk array.

I want to extend one file system on a logical volume [vg01] (not the boot disk). This logical volume is located on a Autoraid disk array.
I know I'll have to first unmount the file system, run lvextend, and extendfs.
Because this file system lives on an Autoraid
disk array are the procedures the same?
Is there anything differnet that I should know about?

10 points to any good answer.
Thank you, Gino.

I should

[Ravi_8 · Accepted solution]

Hi Gino

Procedure is the same.
Instaed of you doing unmounting,lvextend and extendfs, use 'increase size' in SAM-->disk& file sysetm -->logical volumes

[Karamanolis Nikos]

Hi Gino

Assuming that there are enough free PE on that VG, no special consideration needed, except maybe the care of leaving space, large enough for the most frequently used data to be stored in RAID 1/0.

Regards,

Nikos

[Donald Kok]

It is possible that there is more space on the AutoRaid than is used in the vg. If you need it, you have to create a lun, and put the lun in the vg.

[Brian M Rawlings]

Gino: A couple of things...

1> If the current LUN(s) have sufficient available space, great, just expand as you indicated. LUNs are treated like any other PVs.

2> If you need more space, and you have to add a LUN, it is a good idea from a performance standpoint to alternate the "primary" I/O path to the standby path listed for the previous LUN. If you do a 'vgdisplay -v /dev/', at the end will be listed your PVs.

Presuming alternate paths exist to the Autoraid, each existing LUN should show two paths, with the second being listed as "Alternate". Make this "alternate" channel your primary path by specifying that channel (the "c" number in c?t?d?) in your initial 'vgextend' command. Then, another 'vgextend' which specifies the other channel will bring it in as the "idle" secondary for this LUN. Poor man's load balancing.

3> If you are up to date on patches for your OS, SAM provides a fairly decent interface to the Autoraid array, creating LUNs, and adding them into a VG, along with the other 'extend' functions. LUNs can also be created via the Autoraid front panel (in 2GB size increments, which can be a pain), or on the command line (with arraymgr command, see 'man 1m arraymgr' for details).

Regards, --bmr