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. > It would also > be nice for extra hardware (PCI-X, PCIe card) that added NVRAM storage > to various sun low/mid-range servers that are currently acting as > ZFS/NFS servers. You can do it yourself very easily -- check out the umem cards from Micro Memory, available at http://www.umem.com. Reasonable prices ($1000/GB), they have a Solaris driver, and the performance absolutely rips. > Or maybe someone knows of cheap SSD storage that > could be used for the ZIL? I think several HD's are available with > SCSI/ATA interfaces. As Adam mentioned, this is a bit more involved, as most SSDs are biased very heavily towards reads and away from writes. So this will be quite a bit more expensive than NVRAM, at least at the moment... - Bryan -------------------------------------------------------------------------- Bryan Cantrill, Solaris Kernel Development. http://blogs.sun.com/bmc _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
