Hi All, I created a zvol with the following options on an X4500 with 16GB of ram:
zfs create -s -b 64K -V 250T tank/bkp I then enabled dedup and compression and exported it to Windows Server 2008 as iSCSI via COMSTAR. There it was formatted with a 64K cluster size which is the NTFS default for volumes of this size. IO performance in Windows is so slow that my backup jobs are timing out. Previously when I created a much smaller volume using a "-b" of 4K and NTFS cluster size of 4K performance was excellent. What I would like to know is what to look at to figure out where the performance is going, e.g. it's the blocksize or it's COMSTAR etc. CPU consumption according to top is very low so compression seems unlikely. The L2ARC is 11G and there is 4G + of free memory and no swapping so dedup seems unlikely as well. I have looked at the latencytop utility for clues but am not familiar enough with the code to conclude anything useful. Thanks!
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