hammer upgrade clarification
dillon at apollo.backplane.com
Tue Feb 2 22:11:55 PST 2010
:Since I am running
:I went directly to hammer version 4.
:The upgrade took only a few seconds. Is that normal? The file system
:is 454G with 198G used. So fast?
Yes. All it has to do is rewrite the UNDO FIFO area, which maxes out
at a gigabyte.
So far the upgrades have not had to do any major meta-data
modifications. Note, however, that an pre-existing directories will
still use the old version 1 layout. Only newly created directories
will use the new layout. i.e. HAMMER can handle both layouts
simultaniously (its just a change in the localization field and I can
flag the version in the directory inode).
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