Re: [was: Cutting the power ... ] Journaling file system
On January 18, 2004 10:48 pm, Micheas Herman wrote: Use flash ram cards and a journaling file system. (soft updates may work but you need to talk to someone that knows about them much better than I do.) Beware when using flash ram as some kind of live filesystem! Flash media has a quite limited number of erase cycles You may think that's plenty, but since filesystem meta-data is often written at the same location (superblocks etc...), this location will quickly reach the threshold, where it can't be used anymore! Even journaling fs are not perfect w.r.t. conserving erase- cycles. Perhaps someone's doing research on a filesystem type that is kindlier to flash media? -- Cordula's Web. http://www.cordula.ws/ ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: [was: Cutting the power ... ] Journaling file system
On Mon, 19 Jan 2004, Cordula's Web wrote: Beware when using flash ram as some kind of live filesystem! Flash media has a quite limited number of erase cycles You may think that's plenty, but since filesystem meta-data is often written at the same location (superblocks etc...), this location will quickly reach the threshold, where it can't be used anymore! Current flash memory spreads the writes around through wear leveling. A logical write to an address is remapped internally to keep the wear as even as possible. There's a kind of neat calculator at: http://www.m-sys.com/content/Developer/Calc.asp There's also a PDF from the same company that talks about how it works, but I couldn't find it on their web site, so: http://www.spezial.de/commercio/dateien/magazin/FFD_Life_Expectancy.pdf -Warren Block * Rapid City, South Dakota USA ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: [was: Cutting the power ... ] Journaling file system
On Sun, Jan 18, 2004 at 11:04:04PM -0500, Pedro Sam wrote: On January 18, 2004 10:48 pm, Micheas Herman wrote: Use flash ram cards and a journaling file system. (soft updates may work but you need to talk to someone that knows about them much better than I do.) I've googled around a bit, but was unable to find a journaling file system for FreeBSD. Specifically, does ReiserFS work in FreeBSD? No. -- Jonathan Chen [EMAIL PROTECTED] -- Lots of folks confuse bad management with destiny - Kin Hubbard ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
