Red Hat Bugzilla – Bug 125857
Disk Utilization Spike right after each update
Last modified: 2007-11-30 17:07:02 EST
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Description of problem:
Disk Utilization %util spikes up to 100% right after upgraded the
kernel from 2.4.21-9.0.3.EL to 2.4.21-15.EL. The high %util last
about 12 hours and then goes down 10% and then spikes up to 45% after
another 12 hours (see attachement 1).
In fact the same behavior happened for the update of
from 2.4.21-9.0.1.EL to 2.4.21-9.0.3.EL. (see attachment 2 [details]).
I only see this heppens on ATA DISK drives not on SCSI Disk drives.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.update the kernel with the release of 2.4.21-15.EL
Created attachment 101082 [details]
Attachment 1 [details], Disk Utilization (%): Disk Device hda of 7 days
The chart of disk utilization(%)
Created attachment 101083 [details]
Attachment 2 [details], Disk Utilization (%): Disk Device hda of last 31 days
This looks to be something for which you might be best off going
through support, as Bugzilla is not an avenue for technical
assistance, but simply a bug tracking system.
To do this, you will need to log into https://www.redhat.com/apps/support/
Hi, Gary. I concur with Suzanne on this one, especially since
the issue might be related to something different installed with
the update that is outside of the kernel. Support is in the best
position to help you.
In the meantime, I'll reassign this to a kernel engineer who knows
about our disk susbsystems. But please let us know what answers
you get back from Customer Support.
My guess is that this isn't a bug, but is a side effect of the prelink
option we use on current systems. After a large number of RPMs are
updated on disk, the system needs to redo the prelink cycle. This
cycle would be disk intensive. It may be something else, but this is
my first guess at the what's going on.
No activity for over 6 months, closing.