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.
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