On Sun, March 17, 2013 8:49 pm, Andre Felipe Machado wrote:
Hello,
Are there new suggestions of backup strategies for many very large mailboxes
(many GB and growing), with up to decades long retention period for deleted
messages also?
I searched the list archives and found the 2009 and 2010 threads interesting,
but then proposed solutions may not scale to today and future needs.
Guess that some form of tape archiving may be needed for such long periods.
Our initial idea was to use some form of tiered storage, and decades of
expunge delay. But messages flagged as deleted could sum up to millions on
each of such large mailboxes years ahead, maybe causing dificulties with large
directories (stat from tape backup sw, squatter).
Will hashing mailboxes directories option help?
Is there a clean way to move messages marked as deleted to another partition?
http://en.wikipedia.org/wiki/Linear_Tape_File_System
Maybe, if cyrus becomes compatible with NFS, then HSM solutions like
http://www.openarchive.net could help.
Andre,
While, in general, participants in this forum still are pretty reluctant
putting their Cyrus mailstores on NFS storage, there has been at least
one architect/administrator of a very large Cyrus configuration pretty
happy using NetApp filers and NFS as their underlying storage structure.
When using intelligent storage (does not have to be NFS, sub-LUN tiering
in block access methods (iSCSI, FC) will also do the job) you will be
pushing the tiering issue down to your storage level, which may be (part
of) a solution to your problem.
Kind regards,
Eric Luyten, Computing Centre VUB/ULB.
Cyrus Home Page: http://www.cyrusimap.org/
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