DragonFly bugs List (threaded) for 2008-07
DragonFly BSD
DragonFly bugs List (threaded) for 2008-07
[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]

Re: [issue1082] dfly-2.0.0-REL: panic: hammer: insufficient undo FIFO space!


From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 23 Jul 2008 22:29:51 -0700 (PDT)

    Ok I've tracked it down.  There are two issues, both related to the
    fact that the filesystem is really small.

    The main bug is actually with newfs_hammer.  When a small filesystem
    is created newfs_hammer reserves way too small a space for the UNDO
    FIFO.  A 6G filesystem only reserves 8M of undo space!  That isn't
    enough.  100M is really the minimum.  I am going to change newfs_hammer
    to enforce that.

    The second issue is that the filesystem is really too small.  I don't
    want to disallow the creation of small filesystem but I think I will
    also change newfs_hammer to spit out a bunch of warnings when people
    create such small filesystems.

    Finally, keep in mind that you may hit up against serious free space
    issues and may have to run 'hammer prune-everything ...' as well
    as 'hammer reblock ...' quite often on such a small filesystem,
    depending on use.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>



[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]