Re: [Xen-users] Xen 3.1 / Xen 3.2 + DRBD 8.2.4

[Johan Loubser <johanl@xxxxxxxxx>]

On Fri, Feb 15, 2008 at 11:21:13AM +0200, Kalle wrote:
> Hi,
>
> Version: 8.2.4 (api:88)
> Linux node1 2.6.24.2 #3 SMP Mon Feb 11 16:02:06 EET 2008 i686 GNU/Linux
>
> No problems in syncing.
>
> But performance sucks baaaadly.
> Load.avg's up to 200.00 when doing some punisment :))
>
>
> Regards,
> Kalle
>
> Hi all,
>
>
> It seems that there are problems using Xen Kernel with drbd 8-2.4 without 
> tunning parameters...
>
> I have encoutered new problems :
>  - Node A failed with a kernel panic
>  - When Node A restarted, drbd gone in "out of memory"...
>  - I restarted node A in non xen environement (kernel 2.6.23 + drbd 8.0.6)
>  - drbd successful synced
>
> Does someone have correct parameters when using Xen Kernel and drbd > 8 ?
>
> It seems that the proble appears when syncing big volumes (for exemple 
> virtual machine...)
>
> Cheers,
>
> --
> Serge Dewailly
>
>
> Ralf Schenk wrote:
>
>     Serge Dewailly schrieb:
>
>         Hi Ralf,
>
>         Could you please tell me what kernel version do you use ?
>         I'm using a 2.6.18 version.
>
>
>     Im using the XEN supplied kernel wich is
>
>     "Linux msiserver1 2.6.18.8-xen #3 SMP Fri Jan 18 23:49:47 CET 2008 
> x86_64 GNU/Linux"
I have 2 debian etch hosts running drbd 8.0.7
Linux  2.6.18-6-xen-vserver-amd64 #1 SMP Sun Feb 10 18:07:50
UTC 2008 x86_64 GNU/Linux
By using the xen aware additions that was included in 8.0.6 i can setup
the xen domu disk as follow.
disk    = [ 'drbd:r0,hda1,w', 'drbd:r1,hda2,w' ]

In drbd setup net{
    allow-two-primaries;
    after-sb-0pri discard-zero-changes;
    after-sb-1pri discard-secondary;
}
This allow clean live-migrations.
This is in 'n para-virt setup.
Thus xen create manage drbd primary/secondary status.

Johan Loubser

>
>     My DRBD module shows
>     root@msiserver1:~# modinfo drbd
>     filename:       /lib/modules/2.6.18.8-xen/kernel/drivers/block/drbd.ko
>     alias:          block-major-147-*
>     license:        GPL
>     description:    drbd - Distributed Replicated Block Device v8.2.4
>
>     author: Philipp Reisner <phil@xxxxxxxxxx>, Lars Ellenberg 
> <lars@xxxxxxxxxx>
>
>     srcversion:     6780BBFB69F7B6AC97385B2
>     depends:
>     vermagic:       2.6.18.8-xen SMP mod_unload gcc-4.0
>     parm:           minor_count:Maximum number of drbd devices (1-255) 
> (int)
>     parm:           allow_oos:DONT USE! (int)
>     parm:           enable_faults:int
>     parm:           fault_rate:int
>     parm:           fault_count:int
>     parm:           fault_devs:int
>     parm:           trace_level:int
>     parm:           trace_type:int
>     parm:           trace_devs:int
>     parm:           usermode_helper:string
>
>
>
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>


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