This is a writable value, in minutes, controlling how often I/O statistics are gathered, with 0 disabling that data collection. An administrator tunes this interval to control how frequently the vmsIo counters, like vmsIoDirectIO and vmsIoBufferedIO, are refreshed relative to the overhead of collecting them. For example, shortening vmsIoUpdateInterval while investigating an I/O performance problem would give the administrator more current visibility into system-wide I/O activity.