On 2013-01-16 00:58, Jason Matthews wrote:
I am confused. Zpool iostat -v worn 5 1000 reports this... The three disks with goose eggs are offline. I am burning out the last few cells on all four SSDs so I can RMA. However, I am confused why the only disk that works reports 149 write operations while the pool reports 465. How does that work? The system is running 151a
MAYBE, write-coalescing comes into play? Your OS sends several IOs to the pool, which are seen to be destined for neighboring sectors and reordered and aggregated accordingly while being sent to the top-level vdev with a particular known layout (and it is possible that for SSDs ZFS knows to use different algorithms - such as try to fill a HW page of cells and reduce wear, but this would only be known and relevant at tlvdev or leaf-vdev level of the stack)? This is pure speculation from me, though based on things I've heard and read casually ;) //Jim _______________________________________________ OpenIndiana-discuss mailing list [email protected] http://openindiana.org/mailman/listinfo/openindiana-discuss
