In der iostat
Manpage habe ich diese beiden ähnlichen Spalten gefunden:
await
The average time (in milliseconds) for I/O requests issued to the device to be served. This
includes the time spent by the requests in queue and the time spent servicing them.
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.
Sollen diese Spalten dasselbe darstellen? Ich scheine, dass sie manchmal zustimmen, aber manchmal nicht:
avg-cpu: %user %nice %system %iowait %steal %idle
4.44 0.02 1.00 0.36 0.00 94.19
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.07 0.96 0.28 1.28 8.98 47.45 72.13 0.02 11.36 11.49 11.34 5.71 0.89
avg-cpu: %user %nice %system %iowait %steal %idle
8.00 0.00 2.50 2.50 0.00 87.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 9.00 2.00 6.00 12.00 68.00 20.00 0.05 6.00 2.00 7.33 6.00 4.80
avg-cpu: %user %nice %system %iowait %steal %idle
4.57 0.00 0.51 0.00 0.00 94.92
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 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
avg-cpu: %user %nice %system %iowait %steal %idle
13.93 0.00 1.99 1.49 0.00 82.59
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 29.00 0.00 4.00 0.00 132.00 66.00 0.03 7.00 0.00 7.00 7.00 2.80
Was ist der Unterschied zwischen diesen beiden Spalten, abgesehen von der offensichtlichen Warnung, svctm
die abgeschrieben wird ?
quelle
await
=svctm
+however_long_in_queue
, so wie es im feinen Handbuch heißt!