On 02/10/12 15:28, George Gallen wrote: > What about an striped array of SSD with a backup battery to flush the write > buffer on power fail. > No more dangerous (IMO) than an array of hard drives - but given the limited > write times of an SSD > That could be more of a danger, unless your using larger drives and not a lot > of data so the drive > Has lot's of area to failover to when it reaches it's write maximum.
I guess a backup battery would save you. Basically, anything to prevent power dying in the middle of a write. But the striped array would probably simply mean several trashed drives instead of one. It's a known, guaranteed, "this is what will kill a drive" scenario, and an array would just mean more drives at risk. The place I came across a major discussion about this (I knew of the issue earlier) said that some combo of Windows, update, and a certain laptop was notorious for writing off drives. The update would flood the cache, then the laptop would suspend. Cue one dead drive and, if within warranty, one no-quibble replacement. Cheers, Wol > > -----Original Message----- > From: u2-users-boun...@listserver.u2ug.org > [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Wols Lists > Sent: Tuesday, October 02, 2012 4:20 AM > To: firstname.lastname@example.org > Subject: Re: [U2] [u2] Parallel processing in Universe > > On 02/10/12 03:49, Ross Ferris wrote: >> If the file were big enough, and already had part files, then I believe that >> you could have a phantom process each of the individual parts. Failing that, >> get an SSD .... relatively cheap, and will give your processing a reasonable >> kick along!! >> > Just be careful with an SSD. If you have a power-fail in the middle of > your process this sounds just like the scenario that will trash it. As > in, totally dead no recovery possible. > > SSDs are great, but a power fail during write can take out the > controller. One dead, irrecoverable disk. And if you're hammering the > i/o you are VERY vulnerable. > > Cheers, > Wol > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users