I/O stats for paths under multipath device show 100% utilization even while idle
Issue
sdXmultipath sub paths report a 100% utilization, even when the multipath and it's sub paths are no longer in use.
$ iostat -dxy 1
avg-cpu: %user %nice %system %iowait %steal %idle
3.91 0.02 1.55 1.07 0.00 93.46
Device r/s w/s rkB/s wkB/s rrqm/s wrqm/s %rrqm %wrqm r_await w_await aqu-sz rareq-sz wareq-sz svctm %util
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda 0.00 27.00 0.00 3696.00 0.00 0.00 0.00 0.00 0.00 14.67 0.40 0.00 136.89 0.81 2.20
sdc 2.00 0.00 1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.50 0.00 500.00 100.00
sdd 3.00 0.00 224.00 0.00 0.00 0.00 0.00 0.00 0.67 0.00 0.00 74.67 0.00 333.33 100.00
sde 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
sdf 1.00 0.00 0.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.50 0.00 1001.00 100.10
Environment
- kernel-4.18.0-553.22.1.el8_10
- kernel-4.18.0-553.27.1.el8_10
- device-mapper-multipath
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