[BackupPC-users] Migration/merge BPC hosts questions
2011-08-11 07:07:24
Hello list,
I've read the wiki and part of the list, but the solutions described there don't satisfy me completely, so I'm looking for something else.
I have two "old" Linux servers running BackupPC 3.1.0 and I need to migrate/merge them to a single new server.
Compression is enabled on both BPC. Cpools sizes are 500Gbytes and 1200Gbytes for a hundred backuped hosts. FullKeepCnt is set to 8,0,12 (56 weeks) so I can't just put the new
server and keep the others around for that time, I need to migrate
everything to get rid of the old ones. I don't need to migrate all at once but I can't skip a day of backup (customer demands).
The new host would be relying on ZFS with compression, deduplication and remote replication.
Currently I plan to do this: 1) fresh install of BackupPC + mimic config (ssh keys, schedules, etc) on new server, 2) for each backuped host, a) disable backup of host (BackupsDisable = 2), b) plain tar pc/<hostname> from old to new server,
c) copy <hostname>.pl from old to new server, d) add <hostname> to hosts file of new server, 3) shutdown old server when all hosts have been migrated.
It's basically the same process described in the wiki without:
1) pre-copying the pool (it would take ages, one of the server only has a 100Mbps internet connection) 2) using BackupPC_tarPCCopy (it does hard links against the pool, which wouldn't exist)
My reasoning about this is I don't need hard links nor the pool anymore, thanks to ZFS deduplication.
What would happen if I did that ? Would BackupPC regenerate the pool over time (with new backups coming in) ? Would I still be able to restore files, browse backups, etc ? And finally, what would happen if I disabled compression on the new server ? I remember reading it would only affect new backups, and I would still be able to access old ones.
All comments are appreciated.
Fabrice
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