> Maybe this random-write issue with Sandforce would not be a > problem?
It is most definitely a problem, as one needs to question the conventional assertion of a sequential write pattern? I presented some findings recently at the Nexenta Training Seminar in Rotterdam. Here is a link to an excerpt (full presentation available to those interested, email cgeorge at ddrdrive dot com): http://www.ddrdrive.com/zil_iopattern_excerpt.pdf In summary, a sequential write pattern is found for a pool with only a single file system. But as additional file systems are added the resultant (or aggregate) write pattern trends to random. Over 50% random with a pool containing just 5 filesystems. This makes intuitive sense knowing each filesystem has it's own ZIL and they all share the dedicated log (ZIL Accelerator). Best regards, Christopher George Founder/CTO www.ddrdrive.com -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
