From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4A7646DB.7020403@degood.org> Date: Sun, 2 Aug 2009 22:09:31 -0400 From: John DeGood User-Agent: Thunderbird 2.0.0.22 (Windows/20090605) MIME-Version: 1.0 To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> References: <13426df10907312012o65cceda4r45a97a981e2dcafa@mail.gmail.com> <6734c542c37eebd5e3cb4f064dea04b3@quanstro.net> <20090801145145.GA1044@polynum.com> <13426df10908010849g8bf24a9nbde0b817b7b3e65e@mail.gmail.com> <3aaafc130908011210u62ed019ev5a91bf668e8fe9d3@mail.gmail.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [9fans] just an idea (Splashtop like) Topicbox-Message-UUID: 36197c6a-ead5-11e9-9d60-3106f5b1d025 erik quanstrom wrote: > just looking at the intel x25-e datasheet, the URE rate > (unrecoverable read error) is the same as enterprise sata > drives at 1e-15, but the mtbf is higher, but within a factor > of two. > > assuming honest mtbf numbers, one would expect similar > ures for the same io workload on the same size data set > as mechanical disks. ... > here are the datasheets. > > http://download.intel.com/design/flash/nand/extreme/319984.pdf > http://www.wdc.com/en/library/spec/2879-701281.pdf For the Intel SSD one must also consider: > 3.5.4 Write Endurance > 32 GB drive supports 1 petabyte of lifetime random writes and 64 GB drive supports 2 petabyte of lifetime random writes. That is equivalent to writing the capacity of the SSD 31250 times. At the specified random 4K write rate of 3300 IOPS one could wear out the SSD in 876 days. Non-random writes could cause more rapid wear, depending on their pattern and the wear leveling algorithms in the SSD. John