On Jan 27, 2010, at 12:25 PM, RayLicon wrote: > Ok ... > > Given that ... yes, we all know that swapping is bad (thanks for the > enlightenment). > > To Swap or not to Swap isn't releated to this question, and besides, even if > you don't page swap, other mechanisms can still claim swap space, such as the > tmp file system. > > The question is simple, "IF" you have to swap (for whatever reason), then > which of two alternatives is better (separate disk partitons on multiple > disks, or zvol ZFS stripes or mirrors - and why).
Swap is striped across swap devices in 1 MB chunks. In other words, striping under the stripe won't make much difference, especially if you are using ZFS dynamic striping. > If no one has any data on this issue then fine, but I didn't waste my time > posting to this site to get responses that simply say -don't swap The data is that 5 orders of magnitude is the latency difference between RAM and HDDs. Double the performance of your swap devices and you are still looking at 5 orders of magnitude. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
