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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 DEBIAN

vgreduce

VGREDUCE(8)						      System Manager's Manual						       VGREDUCE(8)

NAME

       vgreduce - reduce a volume group

SYNOPSIS

       vgreduce  [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi-
       calVolumePath...]

DESCRIPTION

       vgreduce allows you to remove one or more unused physical volumes from a volume group.

OPTIONS

       See lvm for common options.

       -a, --all
	      Removes all empty physical volumes if none are given on command line.

       --removemissing
	      Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes  normal
	      operation of the volume group (new logical volumes may again be created, changed and so on).

	      If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove
	      them manually, you can run this option with --force to have vgreduce remove any partial LVs.

	      Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those  parts
	      that lie on disks that are still present.

	      If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti-
	      vating your logical volumes with --partial as described in lvm (8).

SEE ALSO

       lvm(8), vgextend(8)

Sistina Software UK					 LVM TOOLS 2.02.95(2) (2012-03-06)					       VGREDUCE(8)
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