>From the google_guest_agent code:
google_guest_agent/instance_setup.go:
func setIOScheduler() error {
dir, err := os.Open("/sys/block")
if err != nil {
return err
}
defer dir.Close()
devs, err := dir.Readdirnames(0)
if err != nil {
return err
}
for _, dev := range devs {
// Detect if device is using MQ subsystem.
stat, err := os.Stat("/sys/block/" + dev + "/mq")
if err == nil && stat.IsDir() {
f, err :=
os.OpenFile("/sys/block/"+dev+"/queue/scheduler", os.O_WRONLY|os.O_TRUNC, 0700)
if err != nil {
return err
}
_, err = f.Write([]byte("none"))
if err != nil {
return err
}
}
}
return nil
}
Seems to be intentionally doing that.
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https://bugs.launchpad.net/bugs/1903543
Title:
Block device scheduler should be multiqueue for spinning disks
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