Bryan Cantrill wrote: > On Tue, Jul 03, 2007 at 10:26:20AM -0500, Albert Chin wrote: > >> PSARC 2007/171 will be available in b68. Any documentation anywhere on >> how to take advantage of it? >> >> Some of the Sun storage arrays contain NVRAM. It would be really nice >> if the array NVRAM would be available for ZIL storage. >> > > It depends on your array, of course, but in most arrays you can control > the amount of write cache (i.e., NVRAM) dedicated to particular LUNs. > So to use the new separate logging most effectively, you should take > your array, and dedicate all of your NVRAM to a single LUN that you then > use as your separate log device. Your pool should then use a LUN or LUNs > that do not have any NVRAM dedicated to it.
On some of the new Sun midrange arrays you can disable cache to a LUN but I've never seen hooks that let you dedicate a certain amount of cache to one LUN in particular. (None of the older midrange arrays let you do this.) Some of the high end arrays allow you to pin some data in cache like the 9990. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
