[DRBD-user] iowait / Perfomance problems with xen on drbd (centos 5.2)

Florian Haas florian.haas at linbit.com
Tue Aug 19 08:48:17 CEST 2008

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

Which I/O scheduler (elevator) are you using on the (real) block devices
that your DRBDs reside on?


Jan Kellermann wrote:
> Hi,
> we have 2 servers on centos5.2 in a cluster with the redhat cman in the
> configuration
> CMAN           DRBD > XEN
> For each xen we create a new local LVM on each node, put them in a drbd
> and install an os (debian 4 or ubuntu 8). The xens are running as pvm.
> Everything works fine since over 4 months now.
> But we have some performance-Problems:
> Writing on the Xen-devices produces an iowait about 50 to 60% on the
> xen-processors.
> [...]

: Florian G. Haas
: LINBIT Information Technologies GmbH
: Vivenotgasse 48, A-1120 Vienna, Austria

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