Re: [Xen-users] high availability iscsi and xen setup

[Thomas Halinka <lists@xxxxxxxxx>]

Hi Marc,

Am Donnerstag, den 04.11.2010, 12:58 +0000 schrieb Mark Adams:
> Hi All,
> 
> I'm thinking about the best way to set this up, and would greatly
> appreciate your learned opinions on it. I'm thinking of the following:
> 
> - 2 Storage servers, running LVM, heartbeat, drbd (primary/standy) and iscsi.
>   This will protect against 1 storage server failing.

ACK

> - 2 Xen hosts, running heartbeat to ensure the domU's are available. If
>   not, migrate all hosts on to other xen host. This will protect against
>   1 xen host failure.

ACK

> 
> Any opinions on this arrangement of setup or links to resources
> discussing it would be much appreciated.

If ur interested i could provide a link to my wiki, which describes such
a setup

>  Also any alternative ways to
> provide the same HA would be useful for comparison.
> 
> - Any Pitfalls? 

nope - works like a charm

> - Gaps in the availability? (split-brain possibilities?)

Im running 2 iSCSI-Linux-Targets with a bunch of XEN-Boxes...

> 
> - How would you add in additional xen hosts? would they always need to be
> paired in this arrangement (1 fails over to the other..)

No need for pairing. Just use hb2 with crm and udev for static
device-names...
> 
> - Is a clustered filesystem required?

NOT required, but im testing another kind of such a setup. My receipt is
to run XEN-Boxes with glusterfs as filebases-Diskbackend...

http://www.gluster.com/community/documentation/index.php/GlusterFS_and_Xen

first tests were impressive and performance was higher than iscsi, since
im running ~60VMs over 10GBit-Nics, where the iscsi-targets were the
bottleneck :-(

> 
> Thanks in advance for any advice or opinions on this.
> 
> Regards,
> Mark

hth,

thomas


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