ZFS: Strange performance issues

[Carl Chave]

Chris,

Don't know, but, I will paste in a portion of the ZFS admin guide from SUN:

Because these statistics are cumulative since boot, bandwidth might
appear low if the pool is
relatively idle. You can request a more accurate view of current
bandwidth usage by specifying
an interval. For example:

# zpool iostat tank 2

Later it says about the -v option:

You can use the same set of options (interval and count) when
examining virtual device
statistics.

http://dlc.sun.com/pdf/819-5461/819-5461.pdf

Page 95