Don't waste your time with something other than the DDRdrive for NFS ZIL. If it's RAM based it might work, but why risk it and if it's an SSD forget it. No SSD will work well for the ZIL long term. Short term the only SSD to consider would be Intel, but again long term even that will not work out for you. The 100% write characteristics of the ZIL are an SSDs worst case scenario especially without TRIM support. We have tried them all - Samsung, SanDisk, OCZ and none of those worked out. In particular, anything Sandforce 1500 based was the worst so avoid those at all costs if you dare to try an SSD ZIL. Don't. :)
As for the queue depths, here's the command from the ZFS Evil Tuning Guide: echo zfs_vdev_max_pending/W0t10 | mdb -kw The W0t10 command is what to change. W0t35 (35 seconds) was the old value, 10 is the new one. For our NFS environment, we found W0t2 was the best by looking at the actual IO using dtrace scripts. Email me if you want those scripts. They are here, but need to be edited before they work: http://blogs.sun.com/chrisg/entry/latency_bubble_in_your_io -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
