from man iostat
> - number of waiting requests in (s)sd queue
wait average number of transactions waiting for service
(queue length)
This is the number of I/O operations held in the
device driver queue waiting for acceptance by the
device.
- how IO requests are getting into (s)sd queue for specyfic LUN
actv average number of transactions actively being ser-
viced (removed from the queue but not yet com-
pleted)
This is the number of I/O operations accepted, but
not yet serviced, by the device.
- how long is queue at the moment
wsvc_t average service time in wait queue, in mil-
liseconds
- when IO is removed from (s)sd queue
asvc_t average service time of active transactions, in
milliseconds
type: iostat -xcez 1
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