Re: [Xen-users] Disk i/o on Dom0 suddenly too slow

[Micky <mickylmartin@xxxxxxxxx>]

To add to my last email.
This happens to be related to LVM snapshot. Every time a snapshot is
created for the LVM where a particular domu is on, load on that domu
spikes up to 30 and things become sluggish.

Ionice and lvm parameter formalities didn't help!

To the the real guys out there:
How do you use LVM snapshots with Xen dom0, if any? To me, it seems
like LVM snapshotting isn't a short-term backup strategy at all!



On Tue, Jul 9, 2013 at 1:52 AM, Micky <mickylmartin@xxxxxxxxx> wrote:
> Until now, things were fine but today while doing a regular lvm
> snapshot backup, I noticed a huge lag in I/O.
>
> Whenever i ran dd on dom0, the load on Linux domUs increased to high values.
>
> A simple read/write test on Dom0 showed the speed of 1.2 MB/s.
>
> # dd if=/dev/zero of=./test bs=1k count=1048576
> ^C^C^C^C
> 545259520 bytes (520 MB) copied, 402.32934 seconds, 1.3 MB/s
>
> Running Xen 4.2.1.
>
> Has anyone noticed anything similar?

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