Not sure is it related to the fragmentation, but I can say that serious performance degradation in my NFS/ZFS benchmarks [1] is a result of on-disk ZFS data layout. Read operations on directories (NFS3 readdirplus) are abnormally time consuming . That kills the server. After cold restart of the host the performans is still on the flour. My conclusion: it's not CPU, not memory, it's ZFS on-disk structures.
[1] http://www.opensolaris.org/jive/thread.jspa?threadID=24014 This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
