Is the svctm's output of iostat unreliable in RHEL 6 as described at man page?

Solution In Progress - Updated -

Issue

  • The following is a portion of iostat's man page. It provides a warning and indicates the svctm field will be removed in a future sysstat version.

    # man iostat 
:
svctm     The average service time(in milliseconds) for I/O requests that were issued to the device.
            Warning! Do not trust this field any more. This field will be removed in a future sysstat version.

  • If the output of svctm from iostat cannot be trusted, are there any alternative fields or tools instead of svctm field?

Environment

Red Hat Enterprise Linux 6

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