Hello Leon, Wednesday, February 14, 2007, 10:35:05 AM, you wrote:
LK> An update: LK> Not sure is it related to the fragmentation, but I can say that LK> serious performance degradation in my NFS/ZFS benchmarks is a LK> result of on-disk ZFS data layout. LK> Read operations on directories (NFS3 readdirplus) are abnormally LK> time consuming . That kills the server. After cold restart of the LK> host the performans is still on the flour. LK> My conclusion: it's not CPU, not memory, it's ZFS on-disk structures. LK> Before jumping to any conclusions - first try to eliminate nfs and do readdirs locally - I guess that would be quite fast. Then check on a client (dtrace) the time distribution of nfs requests and sends us results. You may also want to fiddle with async clusters on a nfs client to see if it makes any difference. -- Best regards, Robert mailto:[EMAIL PROTECTED] http://milek.blogspot.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
