Robinson, Eric
2009-Mar-26 16:35 UTC
[Xen-users] Average Disk Queue Lenghts Astronomically High for Win2003 Guest
We have 3 Windows 2003 terminal servers, 2 physical and 1 virtualized. The physical servers run with Average Disk Queue Lengths < 2/spindle, which is normal. The virtualized server shows Average Disk Queue Length of 2000-4000 with the same number of users (and using the same scale). Even though the disk queue lengths are ridiculously high, users experience normal performance, so I think it must be something about the way PerfMon works on a Windows guest. Does anyone have an idea what accounts for this? -- Eric Robinson Disclaimer - March 26, 2009 This email and any files transmitted with it are confidential and intended solely for Xen-user 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/ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Pasi Kärkkäinen
2009-Mar-27 08:01 UTC
Re: [Xen-users] Average Disk Queue Lenghts Astronomically High for Win2003 Guest
On Thu, Mar 26, 2009 at 09:35:54AM -0700, Robinson, Eric wrote:> We have 3 Windows 2003 terminal servers, 2 physical and 1 virtualized. > The physical servers run with Average Disk Queue Lengths < 2/spindle, > which is normal. The virtualized server shows Average Disk Queue Length > of 2000-4000 with the same number of users (and using the same scale). > Even though the disk queue lengths are ridiculously high, users > experience normal performance, so I think it must be something about the > way PerfMon works on a Windows guest. Does anyone have an idea what > accounts for this? >How do you measure active/current disk queue lenghts? -- Pasi _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Robinson, Eric
2009-Mar-27 08:56 UTC
RE: [Xen-users] Average Disk Queue Lenghts Astronomically High for Win2003 Guest
> How do you measure active/current disk queue lenghts?Using Windows Performance Monitor (perfmon.exe). Disclaimer - March 27, 2009 This email and any files transmitted with it are confidential and intended solely for Pasi Kärkkäinen,Xen-user 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/ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Pasi Kärkkäinen
2009-Mar-27 09:14 UTC
Re: [Xen-users] Average Disk Queue Lenghts Astronomically High for Win2003 Guest
On Fri, Mar 27, 2009 at 01:56:47AM -0700, Robinson, Eric wrote:> > How do you measure active/current disk queue lenghts? > > Using Windows Performance Monitor (perfmon.exe). >Ok. Are you using PV drivers in your Windows guest? Or the default Qemu emulated IDE device? -- Pasi _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Robinson, Eric
2009-Mar-28 10:52 UTC
RE: [Xen-users] Average Disk Queue Lenghts Astronomically High for Win2003 Guest
> Ok. Are you using PV drivers in your Windows guest? > Or the default Qemu emulated IDE device?Qemu emulated IDE, I think. How can I be sure? -- Eric Robinson Disclaimer - March 28, 2009 This email and any files transmitted with it are confidential and intended solely for Pasi Kärkkäinen,Xen-user 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/ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Pasi Kärkkäinen
2009-Mar-29 16:40 UTC
Re: [Xen-users] Average Disk Queue Lenghts Astronomically High for Win2003 Guest
On Sat, Mar 28, 2009 at 03:52:34AM -0700, Robinson, Eric wrote:> > Ok. Are you using PV drivers in your Windows guest? > > Or the default Qemu emulated IDE device? > > Qemu emulated IDE, I think. How can I be sure? >Well you should know if you have installed optimized drivers :-) -- Pasi _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users