Hello ZFSland, Is there any significance in the fact that the bandwidth/read figures for a simple cpio into a ZFS filesystem should be multiples of 21.3K (when non-zero) as follows? What could determine this figure? Do I need to read a manpage? ;-) Thanks... Sean. ----- [root at global:/36g2] # zpool iostat 3 capacity operations bandwidth pool used avail read write read write ---------- ----- ----- ----- ----- ----- ----- pool1 117M 8.26G 0 1 696 74.6K pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0 0 0 0 pool1 118M 8.26G 0 26 0 2.10M pool1 118M 8.26G 0 3 0 298K pool1 118M 8.26G 0 22 0 1.73M pool1 118M 8.26G 0 10 0 1.20M pool1 118M 8.26G 0 15 0 875K pool1 118M 8.26G 0 24 0 1.89M pool1 118M 8.26G 0 6 0 723K pool1 118M 8.26G 0 18 0 1.06M pool1 118M 8.26G 0 20 0 1.39M pool1 118M 8.26G 0 22 0 1.60M pool1 118M 8.26G 0 5 42.5K 681K pool1 118M 8.26G 0 17 21.3K 917K pool1 118M 8.26G 0 23 0 1.73M pool1 118M 8.26G 0 23 0 1.68M pool1 118M 8.26G 0 3 0 425K pool1 118M 8.26G 0 19 0 1.27M pool1 118M 8.26G 0 23 0 1.69M pool1 118M 8.26G 0 6 0 766K pool1 118M 8.26G 0 17 0 960K pool1 118M 8.26G 0 22 21.3K 1.60M pool1 118M 8.26G 0 15 0 1.70M pool1 118M 8.26G 0 9 0 150K pool1 118M 8.26G 0 22 0 1.60M pool1 118M 8.26G 0 22 0 1.60M pool1 118M 8.26G 0 7 0 894K pool1 118M 8.26G 0 17 21.3K 833K pool1 118M 8.26G 0 22 0 1.68M pool1 118M 8.26G 0 2 21.3K 298K pool1 118M 8.26G 0 21 0 1.44M pool1 118M 8.26G 0 24 0 1.81M pool1 118M 8.26G 0 1 21.3K 128K pool1 118M 8.26G 0 21 0 1.60M pool1 118M 8.26G 0 0 0 0 pool1 118M 8.26G 0 0 0 0 ----- This message posted from opensolaris.org
>Hello ZFSland, > >Is there any significance in the fact that the bandwidth/read figures for a simple cpio into a ZFSfilesystem should be multiples of 21.3K (when non-zero) as follows? What could determine this figu re? Do I need to read a manpage? ;-)> >Thanks... Sean. > >----- > >[root at global:/36g2] # zpool iostat 321.3 * 3 = 63.9 (or in the 63.75-64.05 interval) So perhaps one or more 64K I/Os every 3 seconds? Casper
On Thu, Nov 17, 2005 at 08:12:33PM +0100, casper.dik at sun.com wrote:> > >Hello ZFSland, > > > >Is there any significance in the fact that the bandwidth/read figures > >for a simple cpio into a ZFS filesystem should be multiples of 21.3K > >(when non-zero) as follows? What could determine this figure? Do I > >need to read a manpage? ;-) > > > >Thanks... Sean. > > > >----- > > > >[root at global:/36g2] # zpool iostat 3 > > > 21.3 * 3 = 63.9 (or in the 63.75-64.05 interval) > > So perhaps one or more 64K I/Os every 3 seconds?Also, the reads are probably for the ZFS metadata, which is compressed. --Bill