Thanks for the suggestions. I re-created the pool, set the record size to 8K,
re-created the file and increased the I/O size from the application. It's
nearly all writes now.
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I'm running on s10s_u4wos_12b and doing the following test.
Create a pool, striped across 4 physical disks from a storage array.
Write a 100GB file to the filesystem (dd from /dev/zero out to the file).
Run I/O against that file, doing 100% random writes with an 8K block size.
zpool iostat shows
