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.
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[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
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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