sysstat sar disk statistics | CPU | Memory Free | Swap | IO | Network

By OK -
sysstat includes tools that can also report on CPU and RAM utilization. Although it’s true you can already do this with top, what makes sysstat even more useful is that it provides a simple mechanism to log system statistics like CPU load, RAM, and I/O stats. 
View Disk Statistics Another useful metric to pull from sar is disk statistics. The -b option gives you a basic list of disk I/O information: 

 $ sar -b Linux 2.6.24-22-server (kickseed) 
01/07/2012 07:44:20 PM tps rtps wtps bread/s bwrtn/s 
07:45:01 PM 8.03 0.00 8.03 0.00 106.61 
07:55:01 PM 8.78 0.14 8.64 3.35 127.59 
08:05:01 PM 7.16 0.00 7.16 0.00 61.14 
08:15:01 PM 8.17 0.14 8.03 5.82 139.02 
08:25:01 PM 9.50 0.06 9.44 4.09 212.62 
08:35:01 PM 8.27 0.00 8.27 0.01 74.66 
08:45:01 PM 8.04 0.00 8.04 0.00 71.51 
08:55:01 PM 7.64 0.00 7.64 0.00 66.46 
09:01:18 PM 7.11 0.00 7.11 0.36 63.73 
09:05:01 PM 7.61 0.00 7.61 0.00 72.11 
Average: 8.11 0.04 8.06 1.67 102.52 

 Here you can see the number of total transactions per second (tps) plus how many of those transactions were reads and writes (rtps and wtps, respectively). The bread/s column doesn’t measure bread I/O, instead it tells you the average number of bytes read per second. Similarly, the bwrtn/s tells you average bytes written per second.

CPU Usage of ALL CPUs (sar -u)

This gives the cumulative real-time CPU usage of all CPUs. “1 3” reports for every 1 seconds a total of 3 times. Most likely you’ll focus on the last field “%idle” to see the cpu load.

$ sar -u 1 3
Linux 2.6.18-194.el5PAE (dev-db)        03/26/2011      _i686_  (8 CPU)

01:27:32 PM       CPU     %user     %nice   %system   %iowait    %steal     %idle
01:27:33 PM       all      0.00      0.00      0.00      0.00      0.00    100.00
01:27:34 PM       all      0.25      0.00      0.25      0.00      0.00     99.50
01:27:35 PM       all      0.75      0.00      0.25      0.00      0.00     99.00
Average:          all      0.33      0.00      0.17      0.00      0.00     99.50

CPU Usage of Individual CPU or Core (sar -P)

If you have 4 Cores on the machine and would like to see what the individual cores are doing, do the following.
“-P ALL” indicates that it should displays statistics for ALL the individual Cores.
In the following example under “CPU” column 0, 1, 2, and 3 indicates the corresponding CPU core numbers.

$ sar -P ALL 1 1
Linux 2.6.18-194.el5PAE (dev-db)        03/26/2011      _i686_  (8 CPU)

01:34:12 PM       CPU     %user     %nice   %system   %iowait    %steal     %idle
01:34:13 PM       all     11.69      0.00      4.71      0.69      0.00     82.90
01:34:13 PM         0     35.00      0.00      6.00      0.00      0.00     59.00
01:34:13 PM         1     22.00      0.00      5.00      0.00      0.00     73.00
01:34:13 PM         2      3.00      0.00      1.00      0.00      0.00     96.00
01:34:13 PM         3      0.00      0.00      0.00      0.00      0.00    100.00

Memory Free and Used (sar -r)

This reports the memory statistics. “1 3” reports for every 1 seconds a total of 3 times. Most likely you’ll focus on “kbmemfree” and “kbmemused” for free and used memory.

$ sar -r 1 3
Linux 2.6.18-194.el5PAE (dev-db)        03/26/2011      _i686_  (8 CPU)

07:28:06 AM kbmemfree kbmemused  %memused kbbuffers  kbcached  kbcommit   %commit  kbactive   kbinact
07:28:07 AM   6209248   2097432     25.25    189024   1796544    141372      0.85   1921060     88204
07:28:08 AM   6209248   2097432     25.25    189024   1796544    141372      0.85   1921060     88204
07:28:09 AM   6209248   2097432     25.25    189024   1796544    141372      0.85   1921060     88204
Average:      6209248   2097432     25.25    189024   1796544    141372      0.85   1921060

Swap Space Used (sar -S)

This reports the swap statistics. “1 3” reports for every 1 seconds a total of 3 times. If the “kbswpused” and “%swpused” are at 0, then your system is not swapping.

$ sar -S 1 3
Linux 2.6.18-194.el5PAE (dev-db)        03/26/2011      _i686_  (8 CPU)

07:31:06 AM kbswpfree kbswpused  %swpused  kbswpcad   %swpcad
07:31:07 AM   8385920         0      0.00         0      0.00
07:31:08 AM   8385920         0      0.00         0      0.00
07:31:09 AM   8385920         0      0.00         0      0.00
Average:      8385920         0      0.00         0      0.00

Overall I/O Activities (sar -b)

This reports I/O statistics. “1 3” reports for every 1 seconds a total of 3 times.
Following fields are displays in the example below.
  • tps – Transactions per second (this includes both read and write)
  • rtps – Read transactions per second
  • wtps – Write transactions per second
  • bread/s – Bytes read per second
  • bwrtn/s – Bytes written per second

$ sar -b 1 3
Linux 2.6.18-194.el5PAE (dev-db)        03/26/2011      _i686_  (8 CPU)

01:56:28 PM       tps      rtps      wtps   bread/s   bwrtn/s
01:56:29 PM    346.00    264.00     82.00   2208.00    768.00
01:56:30 PM    100.00     36.00     64.00    304.00    816.00
01:56:31 PM    282.83     32.32    250.51    258.59   2537.37
Average:       242.81    111.04    131.77    925.75   1369.90

Report network statistics (sar -n)

This reports various network statistics. For example: number of packets received (transmitted) through the network card, statistics of packet failure etc.,. “1 3” reports for every 1 seconds a total of 3 times.
sar -n KEYWORD
KEYWORD can be one of the following:
  • DEV – Displays network devices vital statistics for eth0, eth1, etc.,
  • EDEV – Display network device failure statistics
  • NFS – Displays NFS client activities
  • NFSD – Displays NFS server activities
  • SOCK – Displays sockets in use for IPv4
  • IP – Displays IPv4 network traffic
  • EIP – Displays IPv4 network errors
  • ICMP – Displays ICMPv4 network traffic
  • EICMP – Displays ICMPv4 network errors
  • TCP – Displays TCPv4 network traffic
  • ETCP – Displays TCPv4 network errors
  • UDP – Displays UDPv4 network traffic
  • SOCK6, IP6, EIP6, ICMP6, UDP6 are for IPv6
  • ALL – This displays all of the above information. The output will be very long.

$ sar -n DEV 1 1
Linux 2.6.18-194.el5PAE (dev-db)        03/26/2011      _i686_  (8 CPU)

01:11:13 PM     IFACE   rxpck/s   txpck/s   rxbyt/s   txbyt/s   rxcmp/s   txcmp/s  rxmcst/s
01:11:14 PM        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:11:14 PM      eth0    342.57    342.57  93923.76 141773.27      0.00      0.00      0.00
01:11:14 PM      eth1      0.00      0.00      0.00      0.00      0.00      0.

Comments

Post a Comment

Popular posts from this blog

HAproxy logging

By OK -
ubuntu@ubuntu:/etc/haproxy$ cat /etc/rsyslog.d/haproxy.conf # Create an additional socket in haproxy's chroot in order to allow logging via # /dev/log to chroot'ed HAProxy processes $ModLoad imudp $UDPServerRun 514 local0.* -/var/log/haproxy-0.log local1.* -/var/log/haproxy-1.log ### keep logs in localhost ## $AddUnixListenSocket /var/lib/haproxy/dev/log ------------------- ubuntu@ubuntu:/etc/haproxy$ cat /etc/haproxy/haproxy.cfg global chroot /var/lib/haproxy user haproxy group haproxy log 127.0.0.1   local0         log 127.0.0.1   local1 notice daemon frontend www     bind 192.168.40.128:8282    # haproxy public IP     default_backend as-backend    # backend used backend as-backend    balance leastconn    mode http  server as1 192.168.40.128:8082 check    # application srv 1 defaults log global mode http option httplog option dontlognull         contimeout 5000    
Read more

tomcat catalina coyote jasper cluster

By OK -
Tomcat Component are Catalina Coyote Jasper Cluster Catalina :  Catalina is the name of the servlet container of Apache Tomcat since version 4.x. Tomcat implements Sun Microsystems' specifications for servlet and JavaServer Pages (JSP), which are important Java-based Web technologies. Tomcat's servlet container was redesigned as Catalina in Tomcat version 4.x. other components of the Tomcat engine are: Tomcat Jasper which converts the code portions within JavaServer Pages into servlets and pass them to Catalina to process. Tomcat Coyote which is an HTTP connector based on HTTP/1.1 specifications that receives and transmits web requests to the Tomcat engine by listening to a TCP/IP port and returns requests back to the requesting client. Coyote :  The Coyote JK Connector element represents a Connector component that communicates with a web connector via the JK protocol (also known as the AJP protocol). This is used for cases where you wish to invisibly integr
Read more

NFS mount add in fstab _netdev instead of default | firewall-cmd --list-all

By OK -
Redhat recommends us to add  _netdev  option for NFS file system in /etc/fstab. So that they can be mounted after starting the networking service. Alternative ways to refer to partitions: Label : LABEL=label Network ID Samba : //server/share NFS : server:/share SSHFS : sshfs#user@server:/share Device : /dev/sdxy (not recommended) Example #1 //192.168.1.134/share_name /mnt/share_name cifs username=server_user,password=server_password,_netdev 0 0 ^ Path to your share ^ Mountpoint ^ Username ^ Password ^ See note A Note A: The  _netdev  options makes sure the mount is only attempted AFTER a network connection has been established. Example #2 10.10.10.1:/vol1/fs1 /data nfs defaults,_netdev 0 0 ============================ [root@localhost ~]# firewall-cmd --list-all public   target: default   icmp-block-inversion: no   interfaces:   sources:   services: dhcpv6-client high-availability ssh   ports:   protocols:   masquera
Read more