We've looked at this but decided on nfs/cifs backups as ndmp backups go
to storage pools with type NETAPPDUMP, which you can't reclaim, copy
(offsite), etc, etc.

Also, i suspect tsm doesn't support DAR (direct access restore - a
somewhat controversial ndmp feature :-) which allows you to restore part
of a netapp volume (from somewhere in the directory tree).

nfs over GBE is ok ito throughput.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Mike Wiggan
Sent: 11 February 2004 14:20
To: ADSM-L AT VM.MARIST DOT EDU
Subject: NDMP TAPE Performance


We are looking to move from NFS and CIFS backup to NDMP. As such we will
purchase FC's for the Filer's and connect through a 1GB SAN. We will run
TSM
5.2.2 on AIX 5.2.

We use 3590H, which provides 14MB/Sec and 60GB/Tape Native. We will
configure our Filer volumes at 1TB.

To be honest I am still not convinced with NDMP, despite CIFS being
atrocious throughput.

Has anyone information on the following.

1)  What is the compression ratio per 3590H tape? The volume could
contain
500K files.

2) If the 1TB Volume only contains say 500GB, does it store 1TB to tape?

3) How long would it take to backup and restore the above volume, with
and
without TOC enabled.

4) When NDMP back's up a file does it store contiguous on the tape?
Because
there is potential for many tape mounts to restore one file.

Any other performance data and consideration is most welcome.

Kind Regards

Mike