Hello, The other day we had a meeting with Data Domain - just the normal vendor update about their products. While informative, several comments were made by DD systems that I thought I like your opinions on. (note: we are a all tape shop, and probably will be until the next hardware refresh in several years)
Interesting comments DD made: 1) de-dup of compressed data. We told them that much of our backup load comes from Oracle backups that are already compressed via Unix compress utility then pushed to TSM. We asked what effect this would have on de-dup. They said we could expect a 4x-5x de-dup ratio on this compress data. I had always thought that compressed data would not de-dup. 2) NFS mounted storage pools. They said that the vast majority of their installations, including TSM installations, use NFS (some OpenStorage for NetBackup, and a little CIFS) for backups to disk. In other words, VTL emulation is a very small percentage of their installations. If you have DD hdwr, are you using NFS or file devices, or, a vtl interface? Is anyone using NFS for a storage pool? 3) DD reclaim of scratch tapes I asked about when/how DD will reclaim no longer used space. In other words, when a scratch tape passed reuse-delay. He said that DD had some kind of interface to backup softw such that it knows when data is no longer needed and reclaimes that space. I know TSM v5.5 has a feature to clear a vol when no longer used with a vtl, but DD was saying they had a special interface to accomplish this. Does DD have a special interface to TSM? Thanks Rick ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.
