Upgrade from 32-bit to AMD-64?

[Xin LI]

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Karl Denninger wrote:
[...]
> I guess I need to schedule the 2-3 hours of downtime..... the reason for
> this, by the way, is that I have a dbms app on there that is getting too
> RAM hungry for its own good (its a Quadcore CPU) and I'm up against the
> RAM limit for 32-bit code.  The board will support more but 32-bit code
> won't; ergo, the only way to get beyond this is to go to 64-bit.

Oh wait!  One thing you wanted to know is that, some database *can* have
different on-disk format for 32-bit and 64-bit binaries.  Be sure to
have a dump handy.  Last time I hit this on a MySQL "upgrade" between
two servers, and I end up using its replication functionality.  The
operation took longer time than I expected at the beginning.

My personal suggestion is that you do an experiment on another box
(64-bit capable) to make sure that the data would work, this never hurts
and avoids surprises (you do want 64-bit compile of your database
application since you want to take full advantage of 64-bit OS); also,
just like all upgrades, full backup is advised.

Cheers,
- --
Xin LI <delphij at delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!
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