[DRBD-user] Slow Reads on VM - Xenserver and DRBD

Phil Stricker downstreamz at gmx.de
Tue Jul 24 11:46:09 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


I think, I am seing two different Problems of which one is isolated:

- Slow performance in a VM
The issue seams to be related to different OSs: In a Debian-VM, I am getting nearly full speed of the drbd-block-device , in a CentOS 5.8 VM, I can only see 10% of that speed.

- Slow overall performance of the raid-array:
I cannot reach more than 450 MB/s on the array (LSI 9260-4i, 8x Intel 320 160 GB SSD). I see 450 MB/s in a Raid10 setting and I see 450MB/s in a Raid0 test setting. That is crazy!

Did you ever see that behaviour?

Best wishes,

> -----Original Message-----
> From: ff at mpexnet.de [mailto:drbd-user-bounces at lists.linbit.com] On
> Behalf Of Felix Frank
> Sent: Tuesday, July 24, 2012 11:17 AM
> To: Christian Balzer
> Cc: drbd-user at lists.linbit.com
> Subject: Re: [DRBD-user] Slow Reads on VM - Xenserver and DRBD
> On 07/24/2012 11:11 AM, Christian Balzer wrote:
> > Yeah, I've read the same thing and am leaning towards KVM for a fully
> > virtualized system, though Vserver and (in the future) LXC work for
> > 90% of the requirements I have.
> Seconded. Linux vServer + DRBD make for a robust HA setup at very good
> performance. A vserver RA for pacemaker is floating through the web.
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