2012-05-07 20:45, Karl Rossing цкщеу:
I'm wondering why the zfs send could be so slow. Could the other server
be slowing down the sas bus?
I hope other posters would have more relevant suggestions, but
you can see if the buses are contended by dd'ing from the drives.
At least that would give you the measure of available sequential
During the send you can also monitor "zpool iostat 1" and usual
"iostat -xnz 1" in order to see how busy the disks are and how
many IO requests are issued. The snapshots are likely sent in
the order of block age (TXG number), which for a busy pool may
mean heavy fragmentation and lots of random small IOs...
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