iostat

[Miquel van Smoorenburg]

Is anyone implementing the statistics a tool like "iostat" needs? I just
made a simplistic version in perl, but all statistics the current kernel
gives are absolute # of read/writes and # of blocks read/written.

Additionally only the stats for the first 4 disks are kept, but there's
no way to find out what those 4 disks are (by a program).

SunOS keeps there stats:

          disk    name of the disk
          r/s     reads per second
          w/s     writes per second
          Kr/s    kilobytes read per second
          Kw/s    kilobytes written per second
          wait    average number of transactions waiting for ser-
                  vice (queue length)
          actv    average number of transactions  actively  being
                  serviced  (removed  from  the queue but not yet
                  completed)
          svc_t   average service time, in milliseconds
          %w      percent of time there are transactions  waiting
                  for service (queue non-empty)
          %b      percent of time the disk is busy  (transactions
                  in progress)

Perhaps we need a /proc/iostat (and /proc/vmstat .. )

If noone is already working on this, I might give it a try (as soon as my
home PC gets fixed, that is ..)

Mike.
-- 
 Miquel van Smoorenburg |  Studying to be a technomage   <*>
    [e-mail]  | "May you live in interesting times"