[linux-lvm] snapshots documentation clarification
dane at greatschools.net
Tue Feb 27 23:58:10 UTC 2007
GS update: single auth db
bmi virtual machine
zimbra schedule downtime: snapshot conversion
zimbra security updates
Section 3.8 "Snapshots" of the LVM Howto has a scary warning after the first paragraph (http://tldp.org/HOWTO/LVM-HOWTO/snapshotintro.html), with a caveat in the last sentence:
"If the snapshot size equals the origin size, it will never overflow."
What exactly does this mean? Does this imply that it's safe to use "long-term" snapshots whose size is equal to the origin's size, without worrying about effects of significant divergence from the original? Long-term to me is 3yrs as the root fs of a (Xen domU) mail server.
Note that in this case, writes to the root fs will be limited to logs (/var/log) and software updates. Mailboxes live on a separate, non-snapshot logical volume.
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