On Thu, Oct 15, 2009 at 12:53:41PM -0700, Robinson, Eric wrote: > > That's a kernel/performance issue. Perhaps there's an issue > > with the storage driver. The fact that the load seems to be > > low is probably because the metrics you're looking at are > > misleading. For instance, the first delay occurs around the > > time the backup client starts and it usually starts by scanning > > all filesystems which probably means many small storage requests. > > The later load is probably due to big I/O (file transfer) and it > > seems to bother the kernel a bit less than the former one. > > If I understand you correctly, when the load shows high it is because > the kernel is reporting it correctly, but when the load shows low it is > because the kernel is not reporting it correctly? If so, then sar and > top cannot be relied upon. If there another way to get to the heart of > the issue?
That was just the only way I could explain what is going on. Of course, I may be wrong :) I don't really know if the high I/O load of that particular kind (at the start of backup) is reflected in the metrics you've shown. Best to ask on the kernel list. Thanks, Dejan > -- > Eric Robinson > > > Disclaimer - October 15, 2009 > This email and any files transmitted with it are confidential and intended > solely for General Linux-HA mailing list. If you are not the named addressee > you should not disseminate, distribute, copy or alter this email. Any views > or opinions presented in this email are solely those of the author and might > not represent those of Physician Select Management and Physician's Managed > Care. Warning: Although Physician Select Management and Physician's Managed > Care have taken reasonable precautions to ensure no viruses are present in > this email, the companies cannot accept responsibility for any loss or damage > arising from the use of this email or attachments. > This disclaimer was added by Policy Patrol: http://www.policypatrol.com/ > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
