I'll throw out some (possibly bad) ideas. Is ARC satisfying the caching needs? 32 GB for ARC should almost cover the 40GB of total reads, suggesting that the L2ARC doesn't add any value for this test.
Are the SSD devices saturated from an I/O standpoint? Put another way, can ZFS put data to them fast enough? If they aren't taking writes fast enough, then maybe they can't effectively load for caching. Certainly if they are saturated for writes they can't do much for reads. Are some of the reads sequential? Sequential reads don't go to L2ARC. What does iostat say for the SSD units? What does arc_summary.pl (maybe spelled differently) say about the ARC / L2ARC usage? How much of the SSD units are in use as reported in zpool iostat -v? -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
