On Sat, Oct 23, 2010 at 1:55 AM, John Murphy <j...@wyosip.com> wrote: > SSD's have a very finite life. I can't go into details on what makes/models > have longer lives, or ways that different companies extend SSD life, but any > enterprise application using SSD's for performance reasons almost considers > the SSD a consumable of the system. Even consumer products manufacturers > are specifying lifetimes for SSD's that would surprise most people... > (short!)...
All I read (such as intel white paper), suggests that lifespan limitations of SSDs are all because of quantity of writes. For a use that I am considering, with limited writes, the lifespan would be tremendous. i > In most EMC type applications, they would probably last a very long time > (especially if swap, syslog, etc were minimized). Many SSD's have all kinds > of magic to refresh the data every so often, and need to be powered on to do > this. > > > On Fri, Oct 22, 2010 at 10:04 PM, Jon Elson <el...@pico-systems.com> wrote: > >> Igor Chudov wrote: >> > Jon, this is sad, but true. >> > >> > So, how would you approach building such a PC yourself? >> > >> Based ENTIRELY on my personal experience, I would go with a used Dell >> Optiplex. >> One good thing about the used thing is that they come "pre tested". >> Now, as for how much >> of their lifetime has been used up, I don't really know. But, I have >> sold a number of them, >> and have used them, and hauled some of them back and forth to a number >> of EMC meetings >> since 2001. I usually end up junking them due to performance rather >> than failure. In fact, >> I have never had a motherboard or PS failure on them. My EMC computers >> are not run 24/7, >> but my desktop and server are. I started with a 100 MHz Pentium Classic >> with 32 MB of memory >> and a 1 GB disk on my Bridgeport. >> I now have a 1 GHz Pentium III on the Bridgeport. This is mostly due to >> Linux bloat and to >> satisfy the demands of openGL for the Axis interface. >> >> One thing is to stay away from anything built in 2001 or 2002, that was >> when the capacitor debacle happened. >> We had one at work that fried the caps, I replaced them and it is still >> running. >> > How about an Atom base mobo, SSD and a PicoPSU? Maybe with a space >> > AC-DC adapter? >> > >> I am a little leery of these SSDs. They do NOT have proven >> reliability. We know what the reliability >> of a name-brand hard drive (Maxtor, Western Digital) is, but these flash >> memory drives haven't been out >> there that long. Some of the mainframe makers have RAM-based SSDs that >> are likely to be amazingly >> reliable. They are made from WELL-tested technology, but of course need >> battery backup and >> hard drive backup to survive. The flash-based stuff has known problems, >> although most of that is >> wear-out from too many writes. I have a SATA drive on my desktop now, >> with an IDE-SATA adaptor >> that plugs into the 40-pin connector on the motherboard. So, it needs 5 >> V power from a drive >> power connector. This is the weak link! The crappy Chinese AMP-ripoff >> connectors don't make good >> contact, and every six months the adaptor loses power. I've fiddled >> with the connector to try to make >> a better contact. Next time it happens, I really have to replace the >> connector with a REAL AMP connector. >> So, these are the kind of things that can bite you, and it is real hard >> to get away from these cheap Chinese >> connectors, cables, etc. when building your own system. >> >> The Atom CPU is Intel's latest technology, and therefore the smallest >> feature size. I have heard it >> mentioned in the same context with short lifetime, but don't actually >> know for sure. It IS, however, >> a 45 nm feature size chip. Long-term reliability is not proven, they >> just came out with the latest >> generation in Dec 2009. I'm sure Intel has stress-tested them to gauge >> long term reliability, and has >> enough experience doing that that they know what can be expected. I >> suspect there is something that >> they have published, if you really want to do the research. >> >> Jon >> >> >> ------------------------------------------------------------------------------ >> Nokia and AT&T present the 2010 Calling All Innovators-North America >> contest >> Create new apps & games for the Nokia N8 for consumers in U.S. and Canada >> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in >> marketing >> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> http://p.sf.net/sfu/nokia-dev2dev >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Nokia and AT&T present the 2010 Calling All Innovators-North America contest > Create new apps & games for the Nokia N8 for consumers in U.S. and Canada > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > http://p.sf.net/sfu/nokia-dev2dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
