hammer upgrade clarification

Matthew Dillon 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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