Hi Roch, > Can you try 4 concurrent tar to four different ZFS > filesystems (same pool).
Hmmm, you're on to something here: http://www.science.uva.nl/~jeroen/zil_compared_e1000_iostat_iops_svc_t_10sec_interval.pdf In short: when using two exported file systems total time goes down to around 4mins (IOPS maxes out at around 5500 when adding all four vmods together). When using four file systems total time goes down to around 3min30s (IOPS maxing out at about 9500). I figured it is either NFS or a per file system data structure in the ZFS/ZIL interface. To rule out NFS I tried exporting two directories using "default NFS" shares (via /etc/dfs/dfstab entries). To my surprise this seems to bypass the ZIL all together (dropping to 100 IOPS, which results from our RAIDZ2 configuration). So clearly "ZFS sharenfs" is more than a nice front end for NFS configuration :). But back to your suggestion: You clearly had a hypothesis behind your question. Care to elaborate? With kind regards, Jeroen -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
