Hi John et al.,
I guess the real question is: do you want to rely on one vendor to do
primary and backup storage? The obvious risk ist to loose not only the
primary data in case of a severe bug or attack.
One more thought is: don´t rely on pit local copies (e.g. snapshots) to be
available in case of a disaster. While snapshots are great for the usual
user-single file restore as well as virus attackt in file level, they
should be only one of the steps taken to protect the data.
TSM has come up with quite some abilities to protect data on NetApp filers,
take a look at NDMP which works well as a data protection for mid-sized
volumes that are not over-utilized. Exploit the virtual file space mappings
for granularity. Single file Restore from NDMP is a pain depending on the
size of the volumes, so I don´t use it in our production environment to
avoid frustration.
TSM 6.1 Client will work with a TSM 5.5 as well as a 6.1 server and Ontap
7.3.x explioting the snapdiff api giving all the incremental forever
goodies and not changing the look and feel compared to CIFS backups
combined with a very fast scan for changed files. DR would still result in
restoring millions of files (a no-go again). To complete the picture, you
could use the snapmirror to tape (TSM 5.5.1 will work, TSM5.5.2 is
supported) to have very fast restore times at all scales, at the cost of
volume-level granularity.
------> All built in at not extra costs for TSM licenses... and easy to
implement! <------
On the other hand, netapp snapmirror will give you more or less instant
access to the backup data for business continuity if you are planning for a
multi-site failove architecture. I tend to be strict about having a
removable copy of all data which will survive almost any kind of disaster
(power, water, virus, admin,junior admin,...), so a cross-site snapmirror
of a metro cluster with local snapshots plus a secondary backup to tape for
additional DR-capabilities really does match well.
Depends on business needs, $$$, manpower and infrastructur off course.
Just my thoughts...
Kind regards,
Markus
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