Solaris

hi there, i'd like to know what exactly zpool's iostat (-v) output measure, especially the writes. Is it only the writes to the ZIL or all writes (including commmits) to the disks? if anyone knows, that'd be helpful roti

You question seems to imply everything is written first to the ZIL which is incorrect. ZFS writes are usually asynchronous so are going straight to their destination. My understanding is 'zpool iostat -v' measures all read/writes to vdevs, regardless of what is written (metadata, zil, data, uberblock, ...). If you are using synchronous writes with no separated log devices, most of the data is written once too so the commits won't trigger a significant i/o load anyway.