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HAMMER Filesystem Update

Submitted by Jeremy
on November 17, 2007 - 5:20am

"HAMMER work is still progressing well, I hope to have most of it working in a degenerate single-cluster (64MB filesystem) case by the end of next week. (cluster == 64MB block of the disk, not cluster as in clustering)," noted Matthew Dillon on the DragonFlyBSD mailing list. He continued, "gluing the per-cluster B-Tree's together for the multi-cluster case is turning out to be more of a headache and will probably take at least 2 weeks to get working. Some fairly sophisticated heuristics will be needed to avoid unnecessary copying between clusters." Matt went on to note that the next DragonFlyBSD release will likely be delayed a month:

"I may decide to move the 2.0 release to mid-January to give myself some more time. This is similar to what we did for 1.8. Also, I think a January release is better then a Christmas release because people get busy with christmas-like things. I want the filesystem to be at least beta quality as of the release and I don't think its possible to get it there by mid-December."

From: Matthew Dillon <dillon@...>
Subject: HAMMER update - 15 nov 2007
Date: Nov 15, 8:54 pm 2007


HAMMER work is still progressing well, I hope to have most of it

    working in a degenerate single-cluster (64MB filesystem) case by the

    end of next week.  (cluster == 64MB block of the disk, not cluster as

    in clustering).


    Gluing the per-cluster B-Tree's together for the multi-cluster case

    is turning out to be more of a headache and will probably take at

    least 2 weeks to get working.  Some fairly sophisticated heuristics

    will be needed to avoid unnecessary copying between clusters.


    I may decide to move the 2.0 release to mid-January to give myself some

    more time.  This is similar to what we did for 1.8.  Also, I think a

    January release is better then a Christmas release because people get

    busy with christmas-like things.  I want the filesystem to be at least

    beta quality as of the release and I don't think its possible to get it

    there by mid-December.


						-Matt

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