THE ADMIN's LAB : LINUX- 37 SAR (RHEL-7) P2

LINUX- 37 SAR (RHEL-7) P2

**Its same for RHEL6 as well as RHEL7.

Other posts under SAR,

SAR - P1
SAR - P2

Cron Entry:

/etc/cron.d/sysstat

Log Dir:

/var/log/sa

Let’s start working with SAR,

VERSION,

[root@rhel7-server ~]# sar -V

sysstat version 10.1.5

Simple sar output,

[root@rhel7-server ~]# sar

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (1 CPU)

01:00:01 PM CPU %user %nice %system %iowait %steal %idle

01:10:01 PM all 0.14 0.00 0.17 0.00 0.00 99.69

01:20:01 PM all 0.12 0.00 0.15 0.08 0.00 99.65

01:30:01 PM all 0.21 0.00 0.23 0.00 0.00 99.56

01:40:02 PM all 0.09 0.05 0.24 0.04 0.00 99.59

01:50:01 PM all 0.09 0.00 0.16 0.00 0.00 99.75

02:00:01 PM all 0.31 0.00 0.37 0.75 0.00 98.57

02:10:01 PM all 0.53 0.00 0.54 0.58 0.00 98.35

02:20:01 PM all 0.10 0.00 0.19 0.15 0.00 99.56

02:30:01 PM all 0.17 0.00 0.23 0.01 0.00 99.59

02:40:01 PM all 0.20 0.00 0.25 0.00 0.00 99.55

02:50:01 PM all 0.09 0.00 0.17 0.00 0.00 99.73

03:00:01 PM all 0.10 0.00 0.17 0.00 0.00 99.72

03:10:01 PM all 0.09 0.00 0.18 0.01 0.00 99.71

Average: all 0.17 0.00 0.23 0.13 0.00 99.46

O/P shows todays data at interval of 10 minutes,

%user: The “user” column showing how long the processor is spending each process.

%nice: nice value is used to change the priority of a process. This table shows the time spend by CPU for process whose nice value has been changed.

%sys: this shows the percentage of time spend by the processor for operating system tasks, means how long & how much of processor time (in percentage) spend for operating system tasks.

%iowait: How long the processer is waiting for devices (input and output)

%steal: How much of resources virtualized from the physical CPU, this column shows the amount of time spend by a CPU (which is virtualized), for resources from the physical CPU.

%idle: This shows the idle time spend by the processor.

Running sar 7 times at interval of 2 seconds,

[root@rhel7-server ~]# sar 2 7

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (1 CPU)

03:55:45 PM CPU %user %nice %system %iowait %steal %idle

03:55:47 PM all 84.00 0.00 16.00 0.00 0.00 0.00

03:55:49 PM all 84.00 0.00 16.00 0.00 0.00 0.00

03:55:51 PM all 83.66 0.00 16.34 0.00 0.00 0.00

03:55:53 PM all 84.00 0.00 16.00 0.00 0.00 0.00

03:55:55 PM all 84.58 0.00 15.42 0.00 0.00 0.00

03:55:57 PM all 84.50 0.00 15.50 0.00 0.00 0.00

03:55:59 PM all 84.00 0.00 16.00 0.00 0.00 0.00

Average: all 84.11 0.00 15.89 0.00 0.00 0.00

See the %user and %system, there might be something unusual going on,

Running sar 7 times at interval of 2 seconds,

[root@rhel7-server ~]# sar 2 7

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (1 CPU)

03:56:23 PM CPU %user %nice %system %iowait %steal %idle

03:56:25 PM all 94.50 0.00 5.50 0.00 0.00 0.00

03:56:27 PM all 94.00 0.00 6.00 0.00 0.00 0.00

03:56:29 PM all 94.00 0.00 6.00 0.00 0.00 0.00

03:56:31 PM all 93.56 0.00 6.44 0.00 0.00 0.00

03:56:33 PM all 94.50 0.00 5.50 0.00 0.00 0.00

03:56:35 PM all 95.02 0.00 4.98 0.00 0.00 0.00

03:56:37 PM all 93.53 0.00 6.47 0.00 0.00 0.00

Average: all 94.16 0.00 5.84 0.00 0.00 0.00

See the %user and %system, there might be something unusual going on,

Running sar 5 times at interval of 2 seconds,

[root@rhel7-server ~]# sar 2 5

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (1 CPU)

04:24:25 PM CPU %user %nice %system %iowait %steal %idle

04:24:27 PM all 1.61 0.00 98.39 0.00 0.00 0.00

04:24:29 PM all 0.00 0.00 100.00 0.00 0.00 0.00

04:24:31 PM all 0.00 0.00 100.00 0.00 0.00 0.00

04:24:33 PM all 0.00 0.00 87.50 12.50 0.00 0.00

04:24:35 PM all 1.82 0.00 56.36 41.82 0.00 0.00

Average: all 0.68 0.00 89.83 9.49 0.00 0.00

See the %system and %iowait, there must be something unusual going on,

CPU STATISTICS VIA SAR:

[root@rhel7-server ~]# sar -P ALL

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

“-P ALL” means statistics for ALL the individual Cores.

[root@rhel7-server ~]# sar -u

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

“-u” means cumulative real-time CPU usage of all CPUs.

I just restarted this system, that’s why nothing in O/P. Let’s check it from previous files.

**use “-f” with sar to fetch data from file.

[root@rhel7-server ~]# sar -P ALL -f /var/log/sa/sa11

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/11/2018 _x86_64_ (1 CPU)

01:30:01 PM CPU %user %nice %system %iowait %steal %idle

01:40:01 PM all 0.31 0.00 0.25 0.47 0.00 98.97

01:40:01 PM 0 0.31 0.00 0.25 0.47 0.00 98.97

01:40:01 PM CPU %user %nice %system %iowait %steal %idle

01:50:01 PM all 0.08 0.00 0.16 0.00 0.00 99.75

01:50:01 PM 0 0.08 0.00 0.16 0.00 0.00 99.75

01:50:01 PM CPU %user %nice %system %iowait %steal %idle

02:00:02 PM all 0.08 0.00 0.17 0.00 0.00 99.75

02:00:02 PM 0 0.08 0.00 0.17 0.00 0.00 99.75

========O/P Truncated=========================

Though there is only one CPU, that’s why showing for “0” only.

[root@rhel7-server ~]# sar -P ALL 1 1

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:00:26 PM CPU %user %nice %system %iowait %steal %idle

05:00:27 PM all 0.00 0.00 0.25 0.00 0.00 99.75

05:00:27 PM 0 0.00 0.00 0.00 0.00 0.00 100.00

05:00:27 PM 1 0.00 0.00 0.00 0.00 0.00 100.00

05:00:27 PM 2 0.00 0.00 0.00 0.00 0.00 100.00

05:00:27 PM 3 0.00 0.00 0.00 0.00 0.00 100.00

Average: CPU %user %nice %system %iowait %steal %idle

Average: all 0.00 0.00 0.25 0.00 0.00 99.75

Average: 0 0.00 0.00 0.00 0.00 0.00 100.00

Average: 1 0.00 0.00 0.00 0.00 0.00 100.00

Average: 2 0.00 0.00 0.00 0.00 0.00 100.00

Average: 3 0.00 0.00 0.00 0.00 0.00 100.00

Here info for all CPU’s are displayed.

[root@rhel7-server ~]# sar -u -f /var/log/sa/sa11

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/11/2018 _x86_64_ (1 CPU)

01:30:01 PM CPU %user %nice %system %iowait %steal %idle

01:40:01 PM all 0.31 0.00 0.25 0.47 0.00 98.97

01:50:01 PM all 0.08 0.00 0.16 0.00 0.00 99.75

02:00:02 PM all 0.08 0.00 0.17 0.00 0.00 99.75

02:10:01 PM all 0.09 0.00 0.17 0.18 0.00 99.57

02:20:01 PM all 0.09 0.00 0.18 0.00 0.00 99.74

02:30:01 PM all 0.08 0.00 0.16 0.00 0.00 99.76

02:40:01 PM all 0.09 0.04 0.24 0.03 0.00 99.60

02:50:01 PM all 0.09 0.00 0.17 0.00 0.00 99.75

03:00:01 PM all 0.09 0.00 0.16 0.00 0.00 99.75

03:10:01 PM all 0.09 0.00 0.16 0.00 0.00 99.75

06:10:01 PM all 0.20 0.00 0.32 0.00 0.00 99.47

06:20:02 PM all 0.16 0.00 0.24 0.18 0.00 99.42

06:30:01 PM all 0.08 0.00 0.20 0.00 0.00 99.72

06:40:01 PM all 0.09 0.00 0.17 0.00 0.00 99.74

06:50:01 PM all 0.09 0.00 0.16 0.00 0.00 99.75

07:00:01 PM all 0.09 0.00 0.16 0.00 0.00 99.75

07:10:01 PM all 0.09 0.00 0.17 0.00 0.00 99.74

07:20:01 PM all 0.21 0.00 0.24 0.08 0.00 99.47

07:30:01 PM all 0.14 0.00 0.21 0.03 0.00 99.62

07:40:01 PM all 0.09 0.00 0.18 0.00 0.00 99.74

Average: all 0.11 0.00 0.19 0.05 0.00 99.64

[root@rhel7-server ~]# sar -u

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

04:53:51 PM CPU %user %nice %system %iowait %steal %idle

05:00:01 PM all 1.12 0.00 0.19 0.19 0.00 98.50

Average: all 1.12 0.00 0.19 0.19 0.00 98.50

[root@rhel7-server ~]# sar -u ALL

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

04:53:51 PM CPU %usr %nice %sys %iowait %steal %irq %soft %guest %gnice %idle

05:00:01 PM all 1.12 0.00 0.18 0.19 0.00 0.00 0.01 0.00 0.00 98.50

Average: all 1.12 0.00 0.18 0.19 0.00 0.00 0.01 0.00 0.00 98.50

REALTIME CPU VIA SAR:

Cumulative CPU’s,

[root@rhel7-server ~]# sar -u 2 5

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:10:33 PM CPU %user %nice %system %iowait %steal %idle

05:10:35 PM all 0.00 0.00 0.00 0.00 0.00 100.00

05:10:37 PM all 0.00 0.00 0.12 0.00 0.00 99.88

05:10:39 PM all 0.00 0.00 0.00 0.00 0.00 100.00

05:10:41 PM all 0.00 0.00 0.12 0.12 0.00 99.75

05:10:43 PM all 0.00 0.00 0.00 0.00 0.00 100.00

Average: all 0.00 0.00 0.05 0.03 0.00 99.92

Individual CPU’s,

[root@rhel7-server ~]# sar -P ALL 2 2

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:10:57 PM CPU %user %nice %system %iowait %steal %idle

05:10:59 PM all 0.00 0.00 0.12 0.00 0.00 99.88

05:10:59 PM 0 0.00 0.00 0.00 0.00 0.00 100.00

05:10:59 PM 1 0.00 0.00 0.00 0.00 0.00 100.00

05:10:59 PM 2 0.00 0.00 0.00 0.00 0.00 100.00

05:10:59 PM 3 0.00 0.00 0.00 0.00 0.00 100.00

05:10:59 PM CPU %user %nice %system %iowait %steal %idle

05:11:01 PM all 1.88 0.00 0.13 0.00 0.00 97.99

05:11:01 PM 0 1.50 0.00 0.00 0.00 0.00 98.50

05:11:01 PM 1 1.51 0.00 0.00 0.00 0.00 98.49

05:11:01 PM 2 2.01 0.00 0.00 0.00 0.00 97.99

05:11:01 PM 3 2.01 0.00 0.00 0.00 0.00 97.99

Average: CPU %user %nice %system %iowait %steal %idle

Average: all 0.94 0.00 0.13 0.00 0.00 98.94

Average: 0 0.75 0.00 0.00 0.00 0.00 99.25

Average: 1 0.75 0.00 0.00 0.00 0.00 99.25

Average: 2 1.00 0.00 0.00 0.00 0.00 99.00

Average: 3 1.00 0.00 0.00 0.00 0.00 99.00

MEMORY VIA SAR:

Amount of memory used, amount of memory free, available cache, available buffers

[root@rhel7-server ~]# sar -r

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

04:53:51 PM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty

05:00:01 PM 451412 627752 58.17 880 227952 1104612 34.78 264764 187444 296

05:10:01 PM 426888 652276 60.44 880 228552 1121636 35.31 288112 187616 304

05:20:01 PM 426844 652320 60.45 880 228576 1121640 35.31 288356 187620 296

05:30:01 PM 426820 652344 60.45 880 228584 1121636 35.31 288284 187624 296

Average: 432991 646173 59.88 880 228416 1117381 35.18 282379 187576 298

REALTIME MEMORY VIA SAR,

[root@rhel7-server ~]# sar -r 2 5

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:33:58 PM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty

05:34:00 PM 427216 651948 60.41 880 228588 1120156 35.27 288188 187620 4

05:34:02 PM 427296 651868 60.40 880 228588 1120156 35.27 288180 187620 4

05:34:04 PM 427296 651868 60.40 880 228588 1120156 35.27 288180 187620 4

05:34:06 PM 427296 651868 60.40 880 228588 1120156 35.27 288180 187620 4

05:34:08 PM 427284 651880 60.41 880 228588 1120156 35.27 288180 187620 4

Average: 427278 651886 60.41 880 228588 1120156 35.27 288182 187620 4

kbcommit & %commit is the overall memory used including RAM & Swap

kbmemfree: Amount of free memory in kilobytes.

Kbmemused: Used memory details in kilobytes, excluding memory used by kernel itself.

%memused: percentage of memory used.

kbbuffers: buffer memory used by the kernel in kilobytes.

kbcached: cached memory used by the kernel in kilobytes.

kbcommit: Amount of memory in kilobytes needed for current workload. This is an estimate of how much RAM/swap is needed to guarantee that there never is out of memory.

%commit: Percentage of memory needed for current workload in relation to the total amount of memory (RAM+SWAP). This number may be greater than 100% because the kernel usually overcommits memory.

kbactive: Amount of active memory in kilobytes (memory that has been used more recently and usually not reclaimed unless absolutely necessary).

kbinact: Amount of inactive memory in kilobytes (memory which has been less recently used. It is more eligible to be reclaimed for other purposes).

kbdirty: Amount of memory in kilobytes waiting to get written back to the disk.

SWAP VIA SAR:

[root@rhel7-server ~]# sar -S

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

04:53:51 PM kbswpfree kbswpused %swpused kbswpcad %swpcad

05:00:01 PM 2097148 0 0.00 0 0.00

05:10:01 PM 2097148 0 0.00 0 0.00

05:20:01 PM 2097148 0 0.00 0 0.00

05:30:01 PM 2097148 0 0.00 0 0.00

Average: 2097148 0 0.00 0 0.00

REALTIME SWAP VIA SAR,

[root@rhel7-server ~]# sar -S 2 5

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:38:10 PM kbswpfree kbswpused %swpused kbswpcad %swpcad

05:38:12 PM 2097148 0 0.00 0 0.00

05:38:14 PM 2097148 0 0.00 0 0.00

05:38:16 PM 2097148 0 0.00 0 0.00

05:38:18 PM 2097148 0 0.00 0 0.00

05:38:20 PM 2097148 0 0.00 0 0.00

Average: 2097148 0 0.00 0 0.00

kbswpfree: Amount of free swap space in kilobytes.

kbswpused: Amount of used swap space in kilobytes.

%swpused: Percentage of used swap space.

kbswpcad: Amount of cached swap memory in kilobytes. This is memory that once was swapped out, is swapped back in but still also is in the swap area.

%swpcad: Percentage of cached swap memory in relation to the amount of used swap space.

Number of memory pages freed, used, and cached,

[root@rhel7-server ~]# sar -R 1 3

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:43:25 PM frmpg/s bufpg/s campg/s

05:43:26 PM 0.00 0.00 0.00

05:43:27 PM 0.00 0.00 0.00

05:43:28 PM 0.00 0.00 0.00

Average: 0.00 0.00 0.00

Report paging statistics,

[root@rhel7-server ~]# sar -B 1 3

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:46:42 PM pgpgin/s pgpgout/s fault/s majflt/s pgfree/s pgscank/s pgscand/s pgsteal/s %vmeff

05:46:43 PM 0.00 1.00 29.00 0.00 62.00 0.00 0.00 0.00 0.00

05:46:44 PM 0.00 0.00 30.00 0.00 63.00 0.00 0.00 0.00 0.00

05:46:45 PM 0.00 0.00 19.00 0.00 63.00 0.00 0.00 0.00 0.00

Average: 0.00 0.33 26.00 0.00 62.67 0.00 0.00 0.00 0.00

majflt/s

Number of major faults the system has made per second, those which have required loading a memory page from disk. If this value is high then need to be alarmed, system is running out of Memory.

%vmeff

Indicates the number of pages scanned per second, if it’s value is 100% then OK and when it is below 30% then there is some issue with virtual memory. Zero value indicates that there is no page scanned during that time.

Report page swap statistics,

[root@rhel7-server ~]# sar -W 1 3

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:48:58 PM pswpin/s pswpout/s

05:48:59 PM 0.00 0.00

05:49:00 PM 0.00 0.00

05:49:01 PM 0.00 0.00

Average: 0.00 0.00

INPUT/OUTPUT STATISTICS VIA SAR,

[root@rhel7-server ~]# sar -b

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

04:53:51 PM tps rtps wtps bread/s bwrtn/s

05:00:01 PM 1.50 1.16 0.34 86.96 3.90

05:10:01 PM 0.49 0.03 0.46 1.91 4.41

05:20:01 PM 0.23 0.00 0.23 0.00 2.15

05:30:01 PM 0.19 0.00 0.19 0.00 1.74

05:40:01 PM 0.22 0.00 0.22 0.00 1.94

05:50:01 PM 0.22 0.00 0.22 0.00 1.92

Average: 0.41 0.13 0.27 9.89 2.59

REALTIME,

[root@rhel7-server ~]# sar -b 1 5

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:59:17 PM tps rtps wtps bread/s bwrtn/s

05:59:18 PM 0.00 0.00 0.00 0.00 0.00

05:59:19 PM 0.00 0.00 0.00 0.00 0.00

05:59:20 PM 0.00 0.00 0.00 0.00 0.00

05:59:21 PM 0.00 0.00 0.00 0.00 0.00

05:59:22 PM 1.00 0.00 1.00 0.00 8.00

Average: 0.20 0.00 0.20 0.00 1.60

tps: Column show transactions per second (includes both R/W, means total no of transfers (I/O request) to physical device.

rtps: Column show read transactions per second, means total number of read requests per second issued to physical devices

wtps: Column show write transactions per second, means total number of write requests per second issued to physical devices.

bread/s: Column show bytes read per second, means total amount of data read from the devices in blocks per second

bwrtn/s: Column show bytes written per second, means total amount of data written to devices in blocks per second

BLOCK DEVICE I/O STATISTICS VIA SAR,

Block devices like mount points, partitions, LUN from storage …

Using option -p (pretty-print) along with -d make the dev column more readable,

[root@rhel7-server ~]# sar -p -d

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

04:53:51 PM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util

05:00:01 PM sda 1.50 86.96 3.90 60.57 0.01 8.86 6.74 1.01

05:00:01 PM sr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

05:00:01 PM rhel-root 1.54 86.96 3.90 59.08 0.01 8.71 6.58 1.01

05:00:01 PM rhel-swap 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

05:00:01 PM rhel-home 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

05:10:01 PM sda 0.49 1.91 4.41 12.94 0.01 14.96 2.43 0.12

05:10:01 PM sr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

05:10:01 PM rhel-root 0.51 1.91 4.41 12.31 0.01 15.64 2.31 0.12

05:10:01 PM rhel-swap 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

05:10:01 PM rhel-home 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

05:20:01 PM sda 0.23 0.00 2.15 9.16 0.01 43.71 1.40 0.03

05:20:01 PM sr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

05:20:01 PM rhel-root 0.25 0.00 2.15 8.50 0.01 42.79 1.30 0.03

====================O/P Truncated======================

REALTIME,

[root@rhel7-server ~]# sar -d 1 1

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

06:21:05 PM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util

06:21:06 PM dev8-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:21:06 PM dev11-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:21:06 PM dev253-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:21:06 PM dev253-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:21:06 PM dev253-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util

Average: dev8-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: dev11-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: dev253-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: dev253-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: dev253-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

[root@rhel7-server ~]# sar -p -d 1 1

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

06:14:50 PM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util

06:14:51 PM sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:14:51 PM sr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:14:51 PM rhel-root 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:14:51 PM rhel-swap 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:14:51 PM rhel-home 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util

Average: sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: sr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: rhel-root 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: rhel-swap 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: rhel-home 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

DEV: Devices minor and major numbers like dev253-0

Tps: Transactions per second count

rd_sec/s: Read operation done in a second

we_sec/s: Write operation done in a second

%util: Total utilization percentage

NETWORK STATISTICS VIA SAR,

[root@rhel7-server ~]# sar -n ALL

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

04:53:51 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s

05:00:01 PM eth0 0.82 0.39 0.07 0.07 0.00 0.00 0.00

05:00:01 PM eth1 0.31 0.00 0.03 0.00 0.00 0.00 0.00

05:00:01 PM eth2 0.30 0.01 0.02 0.00 0.00 0.00 0.00

05:00:01 PM lo 0.69 0.69 0.05 0.05 0.00 0.00 0.00

05:10:01 PM eth0 0.57 0.18 0.04 0.03 0.00 0.00 0.00

05:10:01 PM eth1 0.33 0.00 0.02 0.00 0.00 0.00 0.00

05:10:01 PM eth2 0.32 0.01 0.02 0.00 0.00 0.00 0.00

05:10:01 PM lo 0.21 0.21 0.02 0.02 0.00 0.00 0.00

05:20:01 PM eth0 0.59 0.20 0.04 0.04 0.00 0.00 0.00

05:20:01 PM eth1 0.33 0.00 0.02 0.00 0.00 0.00 0.00

05:20:01 PM eth2 0.33 0.01 0.02 0.00 0.00 0.00 0.00

05:20:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00

05:30:01 PM eth0 0.32 0.01 0.02 0.00 0.00 0.00 0.00

05:30:01 PM eth1 0.33 0.00 0.02 0.00 0.00 0.00 0.00

05:30:01 PM eth2 0.32 0.00 0.02 0.00 0.00 0.00 0.00

05:30:01 PM lo 0.21 0.21 0.02 0.02 0.00 0.00 0.00

================O/P Truncated=========================

KEYWORDS:

DEV – For network interface statistics,

EDEV – Display network device failure statistics

IP – For IPv4 network traffic

EIP – For IPv4 network errors

ICMP – For ICMPv4 network traffic

EICMP – For ICMPv4 network errors

TCP – For TCPv4 network traffic

ETCP – For TCPv4 network errors

UDP – For UDPv4 network traffic

NFS – For NFS client activities

NFSD – For NFS server activities

SOCK – For sockets in use for IPv4

[root@rhel7-server ~]# sar -n DEV 1 1

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

06:29:02 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s

06:29:03 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:29:03 PM eth1 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:29:03 PM eth2 0.00 0.00 0.00 0.00 0.00 0.00 0.00

06:29:03 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s

Average: eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: eth1 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: eth2 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00

IFACE: stands for the nic card interface name

rxpck/s: this shows the total packets received per second

txpck/s: transmitted packets per second

rxcmp/s: compressed packets received

txcmp/s: compressed packets transmitted

rxmcst/s: packets multicasted per second.

LOAD AVERAGE VIA SAR,

[root@rhel7-server ~]# sar -q

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

10:20:51 PM LINUX RESTART

04:53:51 PM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 blocked

05:00:01 PM 0 565 0.02 0.22 0.19 0

05:10:01 PM 0 565 0.00 0.03 0.11 0

05:20:01 PM 0 565 0.00 0.01 0.05 0

05:30:01 PM 0 564 0.00 0.01 0.05 0

05:40:01 PM 0 565 0.00 0.01 0.05 0

05:50:01 PM 0 565 0.00 0.01 0.05 0

06:00:01 PM 0 565 0.00 0.01 0.05 0

06:10:02 PM 0 565 0.01 0.02 0.05 1

06:20:01 PM 0 565 0.00 0.01 0.05 1

06:30:01 PM 0 564 0.00 0.01 0.05 0

Average: 0 565 0.00 0.03 0.07 0

[root@rhel7-server ~]# sar -q 1 5

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

06:38:34 PM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 blocked

06:38:35 PM 0 565 0.00 0.01 0.05 0

06:38:36 PM 1 565 0.00 0.01 0.05 0

06:38:37 PM 0 565 0.00 0.01 0.05 0

06:38:38 PM 0 565 0.00 0.01 0.05 0

06:38:39 PM 0 565 0.00 0.01 0.05 0

Average: 0 565 0.00 0.01 0.05 0

runq-sz: Run queue length (number of processes waiting for run time)

plist-sz: Number of processes and threads in the process list

ldavg-1: System load average for the last minute

ldavg-5: System load average for the past 5 minutes

ldavg-15: System load average for the past 15 minutes

ALL STATISTICS VIA SAR,

[root@rhel7-server ~]# sar -A

FETCH HISTORICAL DATA FROM FILE VIA SAR,

[root@rhel7-server ~]# sar -P ALL -f /var/log/sa/sa10

[root@rhel7-server ~]# sar -P ALL -f /var/log/sa/sa11

Here sa10 & sa11 are files of 10^th & 11^th august.

SAVING OUTPUT OF SAR,

[root@rhel7-server ~]# sar -d 1 3 -o sartest.txt

FETCHING DATA FROM FILE VIA SAR,

[root@rhel7-server ~]# sar -f sartest.txt

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

06:46:03 PM CPU %user %nice %system %iowait %steal %idle

06:46:04 PM all 0.00 0.00 0.00 0.00 0.00 100.00

06:46:05 PM all 0.00 0.00 0.25 0.00 0.00 99.75

06:46:06 PM all 0.00 0.00 0.00 0.00 0.00 100.00

Average: all 0.00 0.00 0.08 0.00 0.00 99.92

IN BETWEEN TIME REPORT VIA SAR,

-s for start time <HH:MM:SS>

-e for end time <HH:MM:SS>

[root@rhel7-server ~]# sar -s 17:00:00

[root@rhel7-server ~]# sar -s 17:00:00 -e 19:00:00

Linux 3.10.0-121.el7.x86_64 (rhel7-server) 08/12/2018 _x86_64_ (4 CPU)

05:00:01 PM CPU %user %nice %system %iowait %steal %idle

05:10:01 PM all 0.08 0.00 0.07 0.01 0.00 99.83

05:20:01 PM all 0.08 0.00 0.06 0.00 0.00 99.86

05:30:01 PM all 0.07 0.00 0.05 0.00 0.00 99.88

05:40:01 PM all 0.08 0.00 0.05 0.00 0.00 99.86

05:50:01 PM all 0.08 0.00 0.06 0.00 0.00 99.86

06:00:01 PM all 0.08 0.00 0.05 0.00 0.00 99.87

06:10:02 PM all 0.08 0.00 0.05 0.00 0.00 99.87

06:20:01 PM all 0.07 0.00 0.06 0.01 0.00 99.86

06:30:01 PM all 0.08 0.00 0.06 0.02 0.00 99.85

06:40:01 PM all 0.08 0.00 0.06 0.00 0.00 99.86

Average: all 0.08 0.00 0.06 0.01 0.00 99.86

[root@rhel7-server ~]# sar -d -s 17:00:00 -e 19:00:00

THE ADMIN's LAB

Sunday, 12 August 2018

LINUX- 37 SAR (RHEL-7) P2

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