On Mon, 15 Jun 2009, Bob Friesenhahn wrote: > In most cases compression is not desireable. It consumes CPU and results in > uneven system performance.
You actually have that backwards. :-) In most cases, compression is very desirable. Performance studies have shown that today's CPUs can compress data faster than it takes for the uncompressed data to be read or written. That is, the time to read or write compressed data + the time to compress or decompress it is less than the time read or write the uncompressed data. Such is the difference between CPUs and I/O! You are correct that the compression/decompression uses CPU, but most systems have an abundance of CPU, especially when performing I/O. -- Rich Teer, SCSA, SCNA, SCSECA URLs: http://www.rite-group.com/rich http://www.linkedin.com/in/richteer _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
