[gpfsug-discuss] mmbackup vs SOBAR

[Robert Horton]

Hi Folks,

I'm setting up a filesystem for "archive" data which will be aggressively tiered to tape using the Spectrum Protect (or whatever it's called today) Space Management. I would like to have two copies on tape for a) reading back the data on demand b) recovering accidentally deleted files etc c) disaster recovery of the whole filesystem if necessary.

My understanding is:

  1.  Backup and Migration are completely separate things to Spectrum Protect. You can't "restore" from a migrated file nor do a DMAPI read from a backup.
  2.  A SOBAR backup would enable the namespace to be restored if the filesystem were lost but needs all files to be (pre-)migrated and needs the filesystem blocksize etc to match.
  3.  A SOBAR backup isn't much help for restoring individual (deleted) files. There is a dsmmigundelete utility that restores individual stubs but doesn't restore directories etc so you really want a separate backup.

My thinking is to do backups to one (non-replicated) tape pool and migrate to another and run mmimgbackup regularly. I'd then have a path to do a full restore if either set of tapes were lost although it seems rather messy and it's a bit of a pain that SP needs to read everything twice.

So... have I understood that correctly and does anyone have any better / alternative suggestions?

Thanks,
Rob

Robert Horton | Scientific Computing Infrastructure Lead
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