Difference between revisions of "Sar -d"
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| + | *<code>[[sar]] -d</code> To report disk ([[block]] devices) activity. See also <code>[[iostat -x]]</code>. | ||
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| + | * <code>[[sar]] -d</code> | ||
| + | * <code>sar -d --human</code> | ||
| + | * <code>sar -d --human | egrep "util|dev253-4"</code> | ||
<pre> | <pre> | ||
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02:46:01 PM dev7-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 | 02:46:01 PM dev7-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 | ||
</pre> | </pre> | ||
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| + | '''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 | ||
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| + | sar | ||
| + | 01:12:01 PM CPU %user %nice %system %iowait %[[steal]] %idle | ||
| + | 01:13:01 PM all 2.99 0.00 6.58 7.13 0.00 83.30 | ||
| + | 01:14:01 PM all 5.39 0.00 2.30 6.70 0.00 85.61 | ||
| + | 01:15:01 PM all 4.80 0.00 0.96 8.91 0.00 85.33 | ||
| + | 01:16:01 PM all 4.65 0.00 0.64 6.19 0.00 88.52 | ||
<code>%iowait</code> column from <code>sar</code> command also provide information about disk I/O requests. | <code>%iowait</code> column from <code>sar</code> command also provide information about disk I/O requests. | ||
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== Activities == | == Activities == | ||
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:: %util > 95% | :: %util > 95% | ||
:::<code>DEVICE="dev253"; for i in `ls -1 /var/log/sysstat/sa??`; do echo $i; sar -f $i -d | awk '$NF>95' | grep $DEVICE | grep -v "^0" ; done</code> | :::<code>DEVICE="dev253"; for i in `ls -1 /var/log/sysstat/sa??`; do echo $i; sar -f $i -d | awk '$NF>95' | grep $DEVICE | grep -v "^0" ; done</code> | ||
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| + | == Related commands == | ||
| + | * <code>[[sar -F]]</code> [[filesystem]] [[disk space usage]] | ||
| + | * <code>[[sar -b]]</code> | ||
| + | * [[Device mapper]]: <code>ls -lrt [[/dev/mapper/]]</code> | ||
| + | * [[iostat]] | ||
| + | * [[/etc/sysstat/sysstat]] | ||
== See also == | == See also == | ||
* {{sysstat}} | * {{sysstat}} | ||
* {{io performance commands}} | * {{io performance commands}} | ||
| + | * {{sar}} | ||
[[Category:Linux]] | [[Category:Linux]] | ||
[[Category:Linux commands]] | [[Category:Linux commands]] | ||
Latest revision as of 12:18, 29 November 2023
sar -dsar -d --humansar -d --human | egrep "util|dev253-4"
sar -d 02:45:01 PM DEV tps rkB/s wkB/s areq-sz aqu-sz await svctm %util 02:46:01 PM dev7-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:46:01 PM dev7-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:46:01 PM dev7-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
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
sar 01:12:01 PM CPU %user %nice %system %iowait %steal %idle 01:13:01 PM all 2.99 0.00 6.58 7.13 0.00 83.30 01:14:01 PM all 5.39 0.00 2.30 6.70 0.00 85.61 01:15:01 PM all 4.80 0.00 0.96 8.91 0.00 85.33 01:16:01 PM all 4.65 0.00 0.64 6.19 0.00 88.52
%iowait column from sar command also provide information about disk I/O requests.
Activities[edit]
- Review read, write and load of block devices using
sarandawk
- wkB/s > 90.000
DEVICE="dev253"; for i in `ls -1 /var/log/sysstat/sa??`; do echo $i; sar -f $i -d | awk '$6>90000' | grep $DEVICE | grep -v "^0" ; done
- rkB/s > 90.000
DEVICE="dev253"; for i in `ls -1 /var/log/sysstat/sa??`; do echo $i; sar -f $i -d | awk '$5>90000' | grep $DEVICE | grep -v "^0" ; done
- %util > 95%
DEVICE="dev253"; for i in `ls -1 /var/log/sysstat/sa??`; do echo $i; sar -f $i -d | awk '$NF>95' | grep $DEVICE | grep -v "^0" ; done
- wkB/s > 90.000
Related commands[edit]
sar -Ffilesystem disk space usagesar -b- Device mapper:
ls -lrt /dev/mapper/ - iostat
- /etc/sysstat/sysstat
See also[edit]
- Performance: sysstat,
sar,sadc,debian-sa1,sa1, sa2,iostat,nfsiostatmpstat,changelog,/usr/lib/sysstat/sadc,/etc/sysstat/sysstat,pidstat, irqstat - IO performance:
iotop, iostat, sar -d, fio, nmon, vmstat -d,dd,nmon,stress sar, installation, sar -A,sar -F, sar -d,sar -I ALL,sar -n NFS,sar -r,sar -S,sar -W,sar -n ALL, Installing sysstat using Ansible,/etc/sysstat/sysstat,/etc/cron.d/sysstat,sar --help, Sysstat changelog,/var/log/sysstat/,cpu time steal, sargraph, isag, Telegraf
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