rsync from zfs raid5 pool is extremely slow

[GoogleCodeExporter]

What steps will reproduce the problem?

1.I rsynced my Lightroom Libraries to my new raid5 zfs box. Source was a raid0 
hfs+ partition. (over eSata) That went fine. Building file list took a while 
but it's a lot of files.

2.Using rsync command to copy them back to a new raid1 zfs partition from the 
raid5 zfs pool. Now the building file list is very slow. Counting the first 
4200 files is nearly instant but then it only counts 100 files every 2secs...

3.

What is the expected output? What do you see instead?
I expected nearly the same speed as the initial copy to the zfs raid5 pool...

What version of the product are you using? On what operating system?
MacZFS-74.2.0 on osX 10.6.3

Please provide any additional information below.
aja speedtest showed around 100Mbps read and write speeds..

Original issue reported on code.google.com by maar...@exit399.com on 16 Apr 2013 at 1:07

[GoogleCodeExporter]

Are there any errors reported by ZFS or in the syslog?
Try "zpool status -v" to check for potential problems with the pool.
Also check the Kernel log (using the console utility) to see if there are any 
harddisk related reports while the file list builds up.
To check directory read speed, you can try a "time find /your/pool/directory 
-type f".  If this is fast, butrsync slow, then it is something else going 
wrong.

Original comment by googlelogin@bjoern-kahl.de on 19 Apr 2013 at 9:45

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