iostat -xn: Why Is wait > 0 If actv < ssd_max_throttle? (Doc ID 1375467.1)

Last updated on JULY 29, 2016

Applies to:

Solaris Operating System - Version 8 6/00 U1 and later
Information in this document applies to any platform.

Goal

Why does iostat(1M) show entries in the wait queue (wait) when the number of active I/O operations (actv) is less than ssd_max_throttle (here: 16)?

                 extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
[...]
15.0 42.5 456.0 4979.9 1.5 2.7 26.1 47.3 16 29 c8t60060E8015341D000001341D0000161Bd0
21.0 47.0 736.0 4831.9 0.7 2.8 11.0 40.6 15 33 c8t60060E8015341D000001341D0000161Ad0
0.5 44.0 64.0 4191.9 1.0 2.6 22.6 57.7 14 18 c8t60060E8015341D000001341D00001619d0
0.0 46.0 0.0 4703.9 0.5 2.6 10.4 57.0 14 19 c8t60060E8015341D000001341D00001618d0

Solution

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