On Thu, Jul 15, 2004 at 10:21:24AM -0400, Thomas Denier wrote:

> We would use LVM to assemble a large number of ESCON 3390 volumes into
> a single file system with a size in the hundreds of gigabytes. This
> would be an ext3 file system with metadata journalling.

One thing to keep in mind is that the LVM support as supplied with
SuSE does have a limit on the number of physical volumes than can be
incorporated into a single VG. You can easily fix that by rebuilding
LVM from source, but several folks have run up against that limit
trying to provide really big chunks of space. If you use mod 9 or mod
27 devices, it may not matter, but you will see performance
degradation on those big disks if everything is in the same directory
and the heads have to move around to service different files.

One comment from running TSM on AIX: you may see better behavior by
having several smaller storage pools holding different directories,
none bigger than the smallest physical volume available.
>From the limited testing I've done, the Linux TSM server appears to
like that as well.

-- db

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