Hi-- On Feb 14, 2011, at 3:17 PM, David Brodbeck wrote: > I would be curious to hear stories from people who actually *have* run > into SSD failures related to write limitations. I've heard a lot of > speculation but no actual anecdotes. I'm sure they're out there; but > I also know people are more likely to complain when things go wrong > than talk about things going right, so my suspicion is it must be > rare.
Back around 2005 / 2006, we were using a bunch of Soekris 4511's, IIRC, running NetBSD and a network IDS we'd been working on, which possibly generated 100s of MB to a few GB of logging per day. Whoever did the initial setup didn't realize that the flash cards of that timeframe were limited to 10K writes or so, and after a few months you started getting 16K chunks of old logfile data, or 16K chunks of new and old logfile data corrupted together-- looked to be a binary OR of the 0 bits. Nothing reported that writes were failing-- evidently the flash cards didn't notice an error and thus didn't report it back to the system. Switching /var to tmpfs resolved the issue for us. >From what I understand (a quick review of wikipedia helps :), modern flash >cards are now typically rated for 100K writes, include ECC bits to actually >correct or at least detect errors and try to remap bad blocks to unused >blocks, and implement wear-leveling techniques of varying degrees of >effectiveness. Regards, -- -Chuck PS: Reposted from a NetBSD thread, was <d5af2a8e-fef0-467e-be4a-b01243e21...@mac.com>.... _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
