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Full Discussion: Iostat inconsistent avgrq-sz
Top Forums UNIX for Advanced & Expert Users Iostat inconsistent avgrq-sz Post 302922726 by maverick_here on Tuesday 28th of October 2014 02:53:02 AM
Old 10-28-2014
RedHat Iostat inconsistent avgrq-sz
Hi Experts,

I have an issue with performance of oracle, the db sits on EBS volumes on and aws EC2 instance. I have captured the iostat data and feed it to iostat_plotter to forward it to the DB administrators. However what I'm trying to understand is the variable avgrq-sz, it is quite in consistent.

The system is running RHEL 6.4 64 bit, Oracle 11g. The block size is 4K .Following is the extract for two devices which are of interest

Code:
Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
xvdj              0.00    80.55   15.18   59.58  1155.01  1121.04    30.45     1.10   14.74   0.70   5.20
xvdj              0.00     0.00    3.00    2.00    48.00    16.00    12.80     0.03    5.80   5.60   2.80
xvdj              0.00     0.00   14.00  162.00   704.00  1296.00    11.36     0.34    1.94   0.87  15.30
xvdj              0.00     0.00    8.00    4.00   304.00    32.00    28.00     0.15   12.25   5.50   6.60
xvdj              0.00     0.00    0.00    1.00     0.00     8.00     8.00     0.00    1.00   1.00   0.10
xvdj              0.00   114.00    2.00  147.00    96.00  2088.00    14.66     0.86    5.77   0.58   8.60
xvdj              0.00     0.00    0.00   33.00     0.00   264.00     8.00     0.05    1.42   0.48   1.60
xvdj              0.00     0.00    4.00    6.00    64.00    48.00    11.20     0.08    7.60   7.00   7.00
xvdj              0.00     0.00    6.00   60.00    96.00   480.00     8.73     0.17    2.56   1.80  11.90
xvdj              0.00     0.00    4.00    3.00    64.00    24.00    12.57     0.10   15.00  14.71  10.30

and

Code:
Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
xvdk              0.00     0.09   38.83   28.48  2696.19   228.51    43.45     0.35    5.24   1.29   8.67
xvdk              0.00     0.00  187.00    3.00  5440.00    24.00    28.76     2.65   14.23   5.26 100.00
xvdk              0.00     0.00  330.00   14.00 12592.00   112.00    36.93     3.54   10.15   2.91 100.00
xvdk              0.00     0.00  270.00    0.00  9968.00     0.00    36.92     4.01   14.99   3.70 100.00
xvdk              0.00     0.00  269.00    0.00  8336.00     0.00    30.99     3.27   12.20   3.72 100.00
xvdk              0.00     0.00  249.00    0.00  8496.00     0.00    34.12     3.50   13.47   4.02 100.00
xvdk              0.00     0.00  261.00    0.00  8432.00     0.00    32.31     3.35   13.19   3.83 100.00
xvdk              0.00     0.00  255.00    3.00  8944.00    24.00    34.76     3.56   13.94   3.88 100.00
xvdk              0.00     0.00  255.00   12.00  7872.00    96.00    29.84     3.04   11.38   3.75 100.10
xvdk              0.00     0.00  281.00    0.00  9424.00     0.00    33.54     3.03   10.79   3.56  99.90

These samples are one sec apart. My first guess is that the data sets which are being processed by oracle need reindexing.

Any suggestions would be highly appreciated
 

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LEARN ABOUT ULTRIX

iostat

iostat(1)						      General Commands Manual							 iostat(1)

Name
       iostat - report I/O statistics

Syntax
       iostat [ -c ] [ -t ] [ disknames ] [ interval ] [ count ]

Description
       The  command  reports  I/O  statistics for terminals, disks and cpus.  For terminals the number of input and output characters are counted.
       For disks the number of 512 byte blocks per second and number of transfers per second are displayed.  For cpus, it provides the	percentage
       of  time  the system has spent in user mode, in user mode running low priority (niced) processes, in system mode, and idling.  On multipro-
       cessor systems these cpu statistics represent a cumulative summary of all the cpus.

       The optional disknames argument causes disk statistics to be displayed for the specified disks.	If this argument  is  not  specified  then
       disk statistics will be displayed for the first 3 disks only.

       The  optional interval argument causes to report once each interval seconds.  The first report is for all time since a reboot and each sub-
       sequent report is for the last interval only.

       The optional count argument restricts the number of reports.

Options
       -c   Displays the percentage of time each cpu spent in user mode, running low priority (nice'd) processes, in system mode, and idling.

       -t   Displays the number of characters read from and written to terminals.

Examples
       This example will cause cpu and disk statistics for the 5 disks ra0, ra1, ra2, ra3, and ra4.
	    iostat ra0 ra1 ra2 ra3 ra4
       This example will cause cpu, terminal, and disk statistics for ra0 to be displayed and updated every 2 seconds.
	    iostat -t ra0 2

Files
See Also
       vmstat(1), cpustat(1)

																	 iostat(1)
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