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[Xen-users] Disk starvation between DomU's

  • To: xen-users@xxxxxxxxxxxxx
  • From: Wiebe Cazemier <wiebe@xxxxxxxxxxxx>
  • Date: Mon, 10 Jun 2013 10:11:21 +0200 (CEST)
  • Delivery-date: Mon, 10 Jun 2013 08:13:17 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: sntHw+yzxcSzFuitBwG/fIiMFfnXdQ==
  • Thread-topic: Disk starvation between DomU's


I have the issue of my virtual machines becoming extremely slow when even only 
one of them is creating a lot of I/O. Is there a way to prioritize disk access? 
I can't seem to find any.

The Xen host in question is:

- Quad core Xeon X3430  @ 2.40GHz
- 3Ware 9650SE RAID6 array, Seagate 2 TB disks.
- Xen 4.0.1-5.8 on Debian 6 (upgrade planned)
- 15 DomU's
- All VM's have noop as disk scheduler (cat /sys/block/xvda2/queue/scheduler)
- VM's are prioritized with 'xm sched-cred', but that doesn't help the disk 
- Dom-0 has significantly more credits (10000) because it needs to service IO's.
- Dom-0 doesn't do anything else.
- All virtual disks are logical volumes, exposed to the VM through xen-blkfront

So, what can I do to improve disk performance or priority?



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