After just announcing msession, I am already getting requests for some
sort of hot spare system.

OK, here is the question: how hot is hot?

A periodic update, where once a minute or so, changes are batched out to
the hot spare.

A really hot spare where all write actions are mirrored on to the hot
spare (this has bigger performance issues)

A cold spare, no actual mirroring, just recreate the sessions from the
web servers, and lose what was on the primary.

Lastly, is redundancy a *MUST HAVE* to be useful? The reason I ask is
because a lot of people use something like MySQL to handle sessions, and
that isn't redundant, nor would I consider it fault tolerant. Msession is
theoretically more reliable in that it doesn't use the hard disk.
Depending on programming errors, it could be as reliable as the hardware
and OS on which it is running.

What do you all think?




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