On Mon, 10 Jun 2013, jdow wrote: > Just a little note, Vladimir, please be aware that there appears to be > a problem with SSDs when you read the same portion of the disk very many > times per day. The section of flash seems to lose data and cannot be > refreshed after a couple years. We have customers who use SSDs in theme > park rides in the vehicles for an audio server. It was a short, ride > length, audio track repeated every run for the ride vehicle - every few > minutes for a 12 hour day 365 days per year. > > We now counsel customers to use features in the program to allow storing > many copies of the audio track and rotate their use to avoid this wear > problem. > > This is mentioned so infrequently in the literature that I am not sure it > has been generally recognized or dealt with by the disk manufacturers. It > surely astounded us when the reports started coming in. Wouldn't the VFS layer make sure the audio track was in cache, avoiding to read from SSD on every request ? Even if the cache pressure (for whatever reason) would flush it from cache, make sure it stays in memory by putting it in a tmpfs filesystem during boot and use that instead ? Seems to me more worthwhile than rotating over different entries in a filesystem on an SSD. Especially since there's no need to keep reading it from SSD... -- -- dag wieers, [log in to unmask], http://dag.wieers.com/ -- dagit linux solutions, [log in to unmask], http://dagit.net/ [Any errors in spelling, tact or fact are transmission errors]