disk died, prime work lost forever? where to put prime? on SSD or HDD?

emily · 2013-02-28, 18:21

recently my SSD disk died :-( mprime was running on it. data recovery impossible... is prime work lost forever? should i unreserve the exponents manually or let the server do it itself?

i now got another SSD but I run prime on a HDD. how would you comment on running prime on an SSD and an HDD? what's better? i want to avoid writing too much on the SSD as it's also the swap area..

Dubslow · 2013-02-28, 18:45

Disk speed makes essentially no difference; checkpoints are written every half hour (excepting user interference), and most likely the OS caches those writes in memory anyways until shutdown or whenever it feels like flushing the cache.

(PS Prime95 can only make local backups so if the disk is non-recoverable, so is your work (unless you made off-disk backups). Please do unreserve it/them on PrimeNet, or add them to your current instance.)

garo · 2013-02-28, 19:41

Please see this: http://forums.anandtech.com/showthread.php?t=2069761
and
http://ubuntuforums.org/showthread.php?t=1937251

You should set swappiness to 0 to reduce SSD writes. Remember SSDs have a finite life.

flashjh · 2013-03-01, 05:49

Didn't read the links, but from the same experience, I don't use SSDs for Prime95/mfakt*/CUDALucas/etc., because they write a lot to the drive. I had an SSD fail from such work. On the other hand, every hard drive could fail, so you may have just gotten a bad drive.

2013-02-28, 18:21	#1
emily Feb 2012 Athens, Greece 47 Posts	disk died, prime work lost forever? where to put prime? on SSD or HDD? recently my SSD disk died :-( mprime was running on it. data recovery impossible... is prime work lost forever? should i unreserve the exponents manually or let the server do it itself? i now got another SSD but I run prime on a HDD. how would you comment on running prime on an SSD and an HDD? what's better? i want to avoid writing too much on the SSD as it's also the swap area..

2013-02-28, 18:45	#2
Dubslow Basketry That Evening! "Bunslow the Bold" Jun 2011 40<A<43 -89<O<-88 3×29×83 Posts	Disk speed makes essentially no difference; checkpoints are written every half hour (excepting user interference), and most likely the OS caches those writes in memory anyways until shutdown or whenever it feels like flushing the cache. (PS Prime95 can only make local backups so if the disk is non-recoverable, so is your work (unless you made off-disk backups). Please do unreserve it/them on PrimeNet, or add them to your current instance.) Last fiddled with by Dubslow on 2013-02-28 at 18:46

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2013-02-28, 19:41	#3
garo Aug 2002 Termonfeckin, IE 5320₈ Posts	Please see this: http://forums.anandtech.com/showthread.php?t=2069761 and http://ubuntuforums.org/showthread.php?t=1937251 You should set swappiness to 0 to reduce SSD writes. Remember SSDs have a finite life.

2013-03-01, 05:49	#4
flashjh "Jerry" Nov 2011 Vancouver, WA 463₁₆ Posts	Didn't read the links, but from the same experience, I don't use SSDs for Prime95/mfakt*/CUDALucas/etc., because they write a lot to the drive. I had an SSD fail from such work. On the other hand, every hard drive could fail, so you may have just gotten a bad drive.