thomat...@gmail.com wrote: > How dangerous is it to run xfs without write barriers?
http://oss.sgi.com/projects/xfs/faq.html#nulls As long as your computer shuts down properly, sends a flush to the drives, and the drives manage to clear their on-board cache before power is removed or the chip set is reset, it's not dangerous at all. :o) Here's a thread from SGI's XFS mailing list from before XFS on Linux had barrier support: http://oss.sgi.com/archives/xfs/2005-06/msg00149.html Here's an informative thread on LKML with some good information: http://lkml.org/lkml/2006/5/19/33 A analysis of the performance hit due to barriers (and a fairly vague suggestion on a solution) can be found at: http://lkml.org/lkml/2006/5/22/278 The executive summary is that you can use xfs_db to change the log (journal) to version 2, which allows larger buffers, which reduces "the impact the barriers have (fewer, larger log IOs, so fewer barriers)." Chris ------------------------------------------------------------------------------ _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
