On Sat, Aug 28, 2010 at 05:50:38AM -0700, Eff Norwood wrote: > I can't think of an easy way to measure pages that have not been consumed > since it's really an SSD controller function which is obfuscated from the OS, > and add the variable of over provisioning on top of that. If anyone would > like to really get into what's going on inside of an SSD that makes it a bad > choice for a ZIL, you can start here: > > http://en.wikipedia.org/wiki/TRIM_%28SSD_command%29 > > and > > http://en.wikipedia.org/wiki/Write_amplification > > Which will be more than you might have ever wanted to know. :)
So has anyone on this list actually run into this issue? Tons of people use SSD-backed slog devices... The theory sounds "sound", but if it's not really happening much in practice then I'm not too worried. Especially when I can replace a drive from my slog mirror for a $400 or so if problems do arise... (the alternative being much more expensive DRAM backed devices) Ray _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
