Public bug reported:
Binary package hint: sysstat
Upstream bug I suppose, but sysstat adds together the block I/O of a
partition and the disk it is on, double-counting all the I/O to or from
a disk. WIth LVM, sar counts the I/O to the PV and the I/O to the LV.
This makes the figures reported by sar -b effectively useless.
Sar should take the topology into account, and not double-count.
ProblemType: Bug
Architecture: i386
Date: Tue Mar 23 06:01:45 2010
DistroRelease: Ubuntu 9.10
Ec2AMI: ami-bb709dd2
Ec2AMIManifest:
ubuntu-images-us/ubuntu-karmic-9.10-i386-server-20100121.manifest.xml
Ec2AvailabilityZone: us-east-1c
Ec2InstanceType: m1.small
Ec2Kernel: aki-5f15f636
Ec2Ramdisk: ari-d5709dbc
Package: sysstat 9.0.3-2ubuntu1
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-302.7-ec2
SourcePackage: sysstat
Tags: ec2-images
Uname: Linux 2.6.31-302-ec2 i686
** Affects: sysstat (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug ec2-images i386
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Sar adds together the block I/O of /dev/sda and /dev/sdaX
https://bugs.launchpad.net/bugs/545170
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