Leon Koll writes: > An update: > > Not sure is it related to the fragmentation, but I can say that serious > performance degradation in my NFS/ZFS benchmarks 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. > > > This message posted from opensolaris.org > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
As I understand the issue, a readdirplus is 2X slower when data is already cached in the client than when it is not. Given that the on-disk structure does not change between the 2 runs, I can't really place the fault on it. -r _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
