> However, this *can* be overcome by frequently re-formatting the SSD (not > the Solaris format, a low-level format using a vendor-supplied utility).
For those looking to "Secure Erase" a OCZ SandForce based SSD to reclaim performance, the following OCZ Forum thread might be of interest: http://www.ocztechnologyforum.com/forum/showthread.php?75773-Secure-Erase-TRIM-and-anything-else-Sandforce OCZ uses the term "DuraClass" as a catch-all for algorithms controlling wear leveling, drive longevity... There is a direct correlation between Secure Erase frequency and expected SSD lifetime. Thread #1 detailing a recommended frequency of Secure Erase use: "3) Secure erase a drive every 6 months to free up previously read only blocks, secure erase every 2 days to get round Duraclass and you will kill the drive very quickly" Thread #5 explaining DuraClass and relationship to TRIM: "Duraclass is limiting the speed of the drive NOT TRIM. TRIM is used along with wear levelling." Thread #6 provides more details of DuraClass and TRIM: "Now Duraclass monitors all writes and control's encryption and compression, this is what effects the speed of the blocks being written to..NOT the fact they have been TRIM'd or not TRIM'd." "You guys have become fixated at TRIM not speeding up the drive and forget that Duraclass controls all writes incurred by the drive once a GC map has been written." Above excerpts written by a OCZ employed thread moderator (Tony). 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
