This is known limitation of DEFAULT settings of AIX LVM. But you're messing
little bit with the terms. Partition can be only power of 2 in range 1-1024
MB.
In AIX each physical volume consists of physical partitions (closest
equivalent in PC world are cylinders) which can be no more than 1016 on
single physical disk multiplied by VG factor. And all disks (physical
volumes in AIX terms) in a VG have same physical partition size. Each
logical volume (similar to partition in PC disks) consists of logical
partitions which have up to three copies thus occupying corresponding
number of physical partitions multiplied by one, two or three. Number of
logical partitions in a logical volume is limited by default to 512 (but
can be changed up to 32 512).
So the size of a file system is limited by (PP size of VG) * (max PPs in
LV). First parameter can be choosen only when VG was created but latter can
be changed at any time.
Suggest to your sysadmin to read AIX LVM concepts in "System Management
Concepts: Operating System and Devices" book, Chapter 6 - Logical volumes.
LVM is very flexible and scalable and its limits do exist but in terabytes
area.

Zlatko Krastev
IT Consultant





"Klein, Robert (CIT)" <kleinr AT EXCHANGE.NIH DOT GOV> on 22.10.2001 16:47:44
Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To:     ADSM-L AT VM.MARIST DOT EDU
cc:

Subject:        Setting up TSM on AIX

We trying to set up a TSM server on AIX.  The person setting up the server
is an experienced Unix sysadmin, but is running into a problem defining
partitions on the AIX box.  The disk system is  350 GB RAID5.  When she
tries to set up a partition larger than 5 GB, she gets an error message.
Anyone have any idea of what she might be doing wrong?  Also, does anyone
have suggestions on how best to set up the partitions  (one partition for
both the db/recovery logs and the disk storage pools, separate partitions,
etc.?)  I checked the ADSM-L archives for the last couple of years and did
not see anything on this issue.

> Thanks for any help you can provide.
>