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Re: [Xen-API] XCP 1.1 - poor disk performance, high load and wa

  • To: xen-api@xxxxxxxxxxxxx
  • From: George Shuklin <george.shuklin@xxxxxxxxx>
  • Date: Sun, 16 Sep 2012 23:36:42 +0400
  • Delivery-date: Sun, 16 Sep 2012 19:36:11 +0000
  • List-id: User and development list for XCP and XAPI <xen-api.lists.xen.org>

By default XCP 1.1. does not support software raid.

Under certain condition you can use is, but you need to know you going do deep water. And it's better to know how to swim... I mean, understand internals of XCP.

If you are 'just a user' - do not use software raid.

If you wish some help here - say which device (virtual or real) is bottleneck.

On 16.09.2012 20:43, SpamMePlease PleasePlease wrote:

I've installed XCP 1.1 from latest available ISO on Hetzner's 4S
server with usage of md raid 1 and LVM for local storage repository.
The problem Im seeing is extremely poor disk performance - importing
vm file that was exported in ~3m from another XCP 1.1 (also Hetzner's
server, but bit older one, EQ6) takes up to 2 hours, and in meantime
the dom0 becomes almost unusable, the load goes up to 2, it has
constant 50% (or higher) of wa(it) and is extremely sluggish.

Now, I wouldnt mind the sluggishness of dom0, but 2h for vm import
seems crazy and unacceptable. I've made multiple installations of the
server to make sure I am not doing anything wrong, but the same setup
works flawless on older machine. I've tested the drives and they seem
to be fine, with up to ~170mb/s throughtput on SATA3.

Is there anything else I can check to see if its hardware problem, or
anything that could be configured on dom0 to make it operational and

Kind regards,

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