Re: Create volume group greater than 2 TB

Oh yeah...forgot to mention that jfs2 is of course required. Whoops.

On Thu, Mar 13, 2008 at 11:52 PM, Bob Booth <booth@xxxxxxxx> wrote:

On Thu, Mar 13, 2008 at 10:54:09PM -0500, F. Even wrote:
To create what you're wanting, you need to have a few things going for
you.

You need to be running a 64bit kernel (or you won't get a filesystem or
file, forget which now, over 1 TB).

With a 32bit kernel you get a 1TB max filesystem, and a 64GB max file
size. The sizes change once you go to jfs2, which requires a 64bit
kernel.

You'll also need a fairly large PP size...and you'll want to at minimum
have
your VG "big enabled" if not scalable.

Here is a good guide for you:

http://www.ibm.com/developerworks/aix/library/au-aix5l-lvm.html

Your hard limits are:

32TB VG
16TB FS
16TB file size

VOLUME GROUP: xxxxxxxvg VG IDENTIFIER: vgid
VG STATE: active PP SIZE: 4096
megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 9360
(38338560 megabytes)
MAX LVs: 256 FREE PPs: 1167
(4780032 megabytes)
LVs: 2 USED PPs: 8193
(33558528 megabytes)
OPEN LVs: 2 QUORUM: 11
TOTAL PVs: 20 VG DESCRIPTORS: 20
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 20 AUTO ON: yes
MAX PPs per VG: 32768 MAX PVs: 1024
LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable

The VG above was created w/ 20 1.9 TB SAN "disks" and a 4GB PP size.


On Thu, Mar 13, 2008 at 5:51 PM, <jkstevenson@xxxxxxxxxx> wrote:

What are the characteristics of the new volume group you created. The
problem may be the result of this being seen as "one" disk.

-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf
Of
Bill Verzal
Sent: Thursday, March 13, 2008 3:25 PM
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Create volume group greater than 2 TB

Not sure what the issue is...here is one of my larger systems:

VOLUME GROUP: xxxxxx VG IDENTIFIER: vgidxxxxx
VG STATE: active PP SIZE: 128
megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 237521
(30402688
megabytes)
MAX LVs: 256 FREE PPs: 15114
(1934592
megabytes)
LVs: 98 USED PPs: 222407
(28468096
megabytes)
OPEN LVs: 98 QUORUM: 265
TOTAL PVs: 529 VG DESCRIPTORS: 529
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 529 AUTO ON: yes
MAX PPs per VG: 262144 MAX PVs: 1024
LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY:
relocatable



This is a "Scalable" vg. 30TB. 529 disks.

BV
--- Paul Deveau <pdeveau@xxxxxxxxxx> wrote:

Hi,

I have a RAID 5 array of 2+ TB. After running cfgmgr I see an
hdiskx.
After adding hdiskx to a new volume group, the maximum size of the
volume group is never greater than 2 TB. How can I get AIX to create
a
VG larger than 2 TB?

Thanks,


--
Paul Deveau
University of Ottawa
Ottawa, ON
K1N 6N5
613-562-5800 x3774
613-562-5161 (fax)






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