ZFS does turn on the ON-DISK write Cache when you give the whole drive
to the ZPOOL ( c5d0 & c7d0 are whole drives )
This ofcourse means that writes to the pool is faster ,
Do you believe that the on-disk caches have any issues on your hardware
?
If You give ZFS a Partition on the disk it wont turn on the write cache.
say you restore the the partition table with fdisk(1m) and then format(1m)
and finally give ZFS partition c5d0s0 and c7d0s0
you will have a slower ZFS without write cache.
if thats stable you have found the problem :-(
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