We should get the reformatter(s) ported to illumos/solaris, if source is available. Something to consider.
- Garrett -----Original Message----- From: zfs-discuss-boun...@opensolaris.org on behalf of Erik Trimble Sent: Wed 12/22/2010 10:36 PM To: Christopher George Cc: zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] Looking for 3.5" SSD for ZIL On 12/22/2010 7:05 AM, Christopher George wrote: >> I'm not sure if TRIM will work with ZFS. > Neither ZFS nor the ZIL code in particular support TRIM. > >> I was concerned that with trim support the SSD life and >> write throughput will get affected. > Your concerns about sustainable write performance (IOPS) > for a Flash based SSD are valid, the resulting degradation > will vary depending on the controller used. > > Best regards, > > Christopher George > Founder/CTO > www.ddrdrive.com Christopher is correct, in that SSDs will suffer from (non-trivial) performance degredation after they've exhausted their free list, and haven't been told to reclaim emptied space. True battery-backed DRAM is the only permanent solution currently available which never runs into this problem. Even TRIM-supported SSDs eventually need reconditioning. However, this *can* be overcome by frequently re-formatting the SSD (not the Solaris format, a low-level format using a vendor-supplied utility). It's generally a simple thing, but requires pulling the SSD from the server, connecting it to either a Linux or Windows box, running the reformatter, then replacing the SSD. Which, is a PITA. But, still a bit cheaper than buying a DDRdrive. <wink> -- Erik Trimble Java System Support Mailstop: usca22-123 Phone: x17195 Santa Clara, CA Timezone: US/Pacific (GMT-0800) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
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