> cache improve write performance or only reads? L2ARC cache device is for reads... for write you want
Intent Log The ZFS Intent Log (ZIL) satisfies POSIX requirements for synchronous transactions. For instance, databases often require their transactions to be on stable storage devices when returning from a system call. NFS and other applica- tions can also use fsync() to ensure data stability. By default, the intent log is allocated from blocks within the main pool. However, it might be possible to get better per- formance using separate intent log devices such as NVRAM or a dedicated disk. For example: # zpool create pool c0d0 c1d0 log c2d0 Multiple log devices can also be specified, and they can be mirrored. See the EXAMPLES section for an example of mirror- ing multiple log devices. Log devices can be added, replaced, attached, detached, and imported and exported as part of the larger pool. but don't underestimate the speed of several slow vdevs vs one fast vdev. > Does anyone make a 3.5" HDD format RAM disk system that isn't horribly http://mail.opensolaris.org/pipermail/zfs-discuss/2007-July/041956.html perhaps adding ram to the system would be more flexible? Rob _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss