I see, so the 70X is how soon you can expect to see your first reallocated sector?
But, that still seems way too low; the underlying erase/write cycles on the NAND cells is in the 1000s I think? Hmm looks like for modern 20nm NAND cells it's ~1000. If the wear leveling is working why should you see reallocated sectors after only 70X writes? My OCZ Vertex 3 is at 341X and no reallocated sectors so far! Mike McCandless http://blog.mikemccandless.com On Mon, Aug 19, 2013 at 1:09 PM, <[email protected]> wrote: > Right, that's what I said. And one write means writing the *whole* disk. So > Mike and I may *both* be right. ;-) > > Karl > > -----Original Message----- > From: ext Uwe Schindler [mailto:[email protected]] > Sent: Monday, August 19, 2013 1:07 PM > To: [email protected] > Subject: RE: Lucene tests killed one other SSD - Policeman Jenkins > > Hi, > > I misunderstood this number on the first time, too. > > 70x does not mean 70 times write fully and then the SSD is gone. It means 70 > times write of the SSD capacity until the first error somewhere in the flash > memory occurs. Those errors are not fatal, they are just list in the > "relocated sector count" or decrease this "SSD remaining lifetime" smart > attribute. So 70 might be correct. > > Uwe > > ----- > Uwe Schindler > H.-H.-Meier-Allee 63, D-28213 Bremen > http://www.thetaphi.de > eMail: [email protected] > > >> -----Original Message----- >> From: Michael McCandless [mailto:[email protected]] >> Sent: Monday, August 19, 2013 6:57 PM >> To: Lucene/Solr dev >> Subject: Re: Lucene tests killed one other SSD - Policeman Jenkins >> >> I am curious :) 70X is really way too low. >> >> I just checked the OCZ Vertex 3 behind the nightly Lucene performance >> tests ( http://people.apache.org/~mikemccand/lucenebench/index.html ), >> which indexes the full Wikpedia English export 3 times nightly. >> >> It's written 74.4 TB, read 35.7 TB, and its odometer (SSD_Life_Left >> from >> smartctl) says 98 out of 100 ... which I think equates to ~11,000x - >> 17,000x write endurance. >> >> This thread is also fun: >> >> http://www.xtremesystems.org/forums/showthread.php?271063-SSD- >> Write-Endurance-25nm-Vs-34nm >> >> Users destroy their SSDs by writing and writing and writing until it >> dies :) >> >> Mike McCandless >> >> http://blog.mikemccandless.com >> >> >> On Mon, Aug 19, 2013 at 12:50 PM, <[email protected]> wrote: >> > Mike, I'm talking about a 1TB SSD option for some hardware we are buying. >> If you are really curious, I can ask the people who are doing the >> project for the model and specs. >> > >> > Karl >> > >> > -----Original Message----- >> > From: ext Michael McCandless [mailto:[email protected]] >> > Sent: Monday, August 19, 2013 12:47 PM >> > To: Lucene/Solr dev >> > Subject: Re: Lucene tests killed one other SSD - Policeman Jenkins >> > >> > Er, which drives have write endurance only 70x? That's exceptionally low? >> I thought this was more like ~1000x for modern consumer SSDs? >> > >> > Mike McCandless >> > >> > http://blog.mikemccandless.com >> > >> > >> > On Mon, Aug 19, 2013 at 12:35 PM, <[email protected]> wrote: >> >> " Only 70 full writes seems a little bit low for an SSD." >> >> >> >> That's what I thought. I was astounded to learn that that is in >> >> fact correct >> (at least for some of the drives we are using here). Automatic >> recovery is how the SSD copes with this failure rate. >> >> >> >> But it is entirely possible that the cause of your problems are >> >> something >> else. >> >> >> >> Karl >> >> >> >> -----Original Message----- >> >> From: ext Uwe Schindler [mailto:[email protected]] >> >> Sent: Monday, August 19, 2013 12:31 PM >> >> To: [email protected] >> >> Subject: RE: Lucene tests killed one other SSD - Policeman Jenkins >> >> >> >> Hi Karl, >> >> >> >> Only 70 full writes seems a little bit low for an SSD. This SSD has >> >> a capacity >> of 64 Gigabytes so 53 Terabytes written is not bad for it. It already >> had the first few errors, so you might be right, as you see from this Smart >> data: >> >> >> >> 231 SSD_Life_Left 0x0013 096 096 010 Pre-fail Always >> >> - 0 >> >> >> >> So this "arbitrary" counter just went down from 100 to 096. I have >> >> the >> feeling that the current issues with this SSD are not really write >> problems, more hardware interface or firmware problems (as seen quite >> often for OCZ Vertex 2). Otherwise it would fail very early. According >> this data it should survive more 10th of years? >> >> >> >> Uwe >> >> >> >> ----- >> >> Uwe Schindler >> >> H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de >> >> eMail: [email protected] >> >> >> >> >> >>> -----Original Message----- >> >>> From: [email protected] [mailto:[email protected]] >> >>> Sent: Monday, August 19, 2013 5:07 PM >> >>> To: [email protected] >> >>> Subject: RE: Lucene tests killed one other SSD - Policeman Jenkins >> >>> >> >>> I am told that SSD's are spec'd for only 70 full writes before they >> >>> get an error. The error block is set aside but eventually something >> >>> critical gets hit. So you should probably should expect this to happen >> again. >> >>> >> >>> Karl >> >> >> >> >> >> >> >> --------------------------------------------------------------------- >> >> To unsubscribe, e-mail: [email protected] For >> >> additional commands, e-mail: [email protected] >> >> >> > >> > --------------------------------------------------------------------- >> > To unsubscribe, e-mail: [email protected] For >> > additional commands, e-mail: [email protected] >> > >> > >> > --------------------------------------------------------------------- >> > To unsubscribe, e-mail: [email protected] For >> > additional commands, e-mail: [email protected] >> > >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [email protected] For additional >> commands, e-mail: [email protected] > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
