hammer upgrade clarification
dillon at apollo.backplane.com
Tue Feb 2 10:45:48 PST 2010
Ok, a few things. First, note that the HAMMER fs in the DragonFly
2.4.x RELEASE only goes up to version 2. The HAMMER fs in the
development branch goes up to version 4. So if you upgrade to
version 4 you have to use a development kernel and you cannot go
back to a 2.4.x release kernel.
The next releases 2.6.x in March will of course be able to go up to
In terms of upgrading, the version applies to the WHOLE filesystem,
including all of its PFSs. So you only need to upgrade the base
mount. You do not need to upgrade each PFS.
In terms of mirror streams it is probably a good idea to kill the
stream, upgrade, then restart the stream. That said I can't think of
anything detrimental if the stream were left running.
BUT! Be careful, the target HAMMER filesystem must be at least the
same or higher version than the source HAMMER filesystem w/ regards to
any mirroring streams. Upgrade your target filesystems first.
<dillon at backplane.com>
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