Re: [ADSM-L] Question about NDMP and TSM.

Ricky,

The Isilon uses the OneFS file system and TSM views it as one huge file system. 
 If backing up to disk, TSM will attempt to preallocate enough space to back up 
the entire allocated space on the Isilon. Defining Virtual File systems will 
not help because directory quota information is not passed to TSM, and TSM only 
sees the total allocated space.

We were able to back up the Isilon to disk when we started on a test system 
with little data on it, around 25 GB.  When we attempted to implement the same 
backups on a second, well-populated Isilon we ran into the space allocation 
problem.

When backing up to tape, TSM assumes you have unlimited storage available and 
is able to run VFS backups.  We use Virtual File Space Mapping (VFS) and back 
up to tape.

Refer to EMC SR#55554646, TSM PMR 23808,122,000.

Jim Schneider
United Stationers
 
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Plair, Ricky
Sent: Tuesday, July 15, 2014 1:21 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Question about NDMP and TSM.

I have been asked to look into backing up our EMC Isilon using our TSM server.

Everything I read,  seems to point to backing this NDMP device to tape.

Problem is, we do not use tape to backup production.

I have researched and found a few articles about backing the NDMP device to 
tape but, there seem to be more cons than pros.

Is there anybody backing up a NDMP device to disk that can give me some pros 
and,  how they are using disk for this task.


I appreciate your time!



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