I guess I'm not being clear ... I don't want the snapshot volume, I want the set of writes that are stored somewhere while the snapshot is in existance.
It is whispered that C R Ritson was heard, on or about 1/28/2004 4:30 AM to say:
I want to use 24-hour snap shots as an archival tool.
I have 2 identical file servers, one primary and one as an off-site=20
mirror. I'd like the primary system to generate a transaction log that=20
rolls over every 24-hours and gets transmitted to the remote site.
I do something similar but with tapes, not a second server. Every evening, about 15 minutes before the backups, I delete an old snapshot and create a new one. As this snapshot is mounted and exported via NFS I have to undo this first (which has caused slight problems, occasionally). I then backup the newly created snapshot to tape using amanda. Using the snapshot ensures that amanda and dump (even though working at the block level) is guaranteed not to see a changing filesystem, and the snapshot remains available for most of the next 24 hours for a user-initiated recovery of yesterday's version of a file. Any longer than that, and we have to go to the tapes, but amanda's indexing makes it quite easy to step back in time and see the filenames that were previously on disk (though not change dates). Such as it is, I can make the snapshot script available.
Chris Ritson (Computing Officer)
-- Chris Beck / Y.A.B.A. / Fungal Genomics CFSG / Concordia University "La loi dans sa majestueuse égalité, interdit à tous, aux riches comme aux pauvres de dormir sous les ponts, de coucher dans la rue et de voler du pain." -- Anatole France (Les Lys Rouge - 1894)
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