Sar adds together the block I/O of /dev/sda and /dev/sdaX

[Jeffrey Baker]

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

[Chuck Short (zulcss)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue that you reported is one that should be reproducible with the live environment of the Desktop CD of the development release - Lucid Lynx. It would help us greatly if you could test with it so we can work on getting it fixed in the next release of Ubuntu. You can find out more about the development release at http://www.ubuntu.com/testing/ . Thanks again and we appreciate your help.

[Scott Moser (smoser)]

Alternatively, instead of using the live CD, you could reproduce on the ec2 images.
 http://uec-images.ubuntu.com/releases/lucid/release/

[Launchpad Janitor (janitor)]

[Expired for sysstat (Ubuntu) because there has been no activity for 60 days.]