suspend writes for external snapshot
Robert
robert at mhi-tx.com
Wed Apr 26 21:07:50 UTC 2006
Greetings,
I am trying to determine if there is a way to suspend write activity on
a FreeBSD filesystem (currently 6.0R) in order to take a snapshot with
external SAN software (Falconstor IPStor)?
Falconstor does not "support" FreeBSD but I am trying to make it work.
I am guessing that if the fs can be put into a state as in "During steps
three through six, all write activity on the filesystem is suspended."
(http://www.usenix.org/publications/library/proceedings/bsdcon02/mckusick/mckusick_html/index.html)
then an external snapshot could be taken of the system using IPStor or
any other SAN software?
Perhaps a tool that uses vn_start_write() and vn_write_finished() that a
sysadmin could use without mucking things up.
Am I reading too much into this, should I not worry about the filesystem
state and simply allow background fsck to run when booting from any of
the inconsistent snapshots?
TIA
Robert
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