On Sat, May 24, 2008 at 3:21 AM, Richard Elling <[EMAIL PROTECTED]> wrote: > Consider a case where you might use large, slow SATA drives (1 TByte, > 7,200 rpm) > for the main storage, and a single small, fast (36 GByte, 15krpm) drive > for the > L2ARC. This might provide a reasonable cost/performance trade-off.
In this case (or in any other case where a cache device is used), does the cache improve write performance or only reads? I presume it cannot increase write performance as the cache is considered volatile, so the write couldn't be committed until the data had left the cache device? >From the ZFS admin guide [1] "Using cache devices provide the greatest performance improvement for random read-workloads of mostly static content." I'm not sure if that means no performance increase for writes, or just not very much? [1]http://docs.sun.com/app/docs/doc/817-2271/gaynr?a=view -- Hugh Saunders _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
