Re: [Xen-users] as promised description of my XEN HA setup

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

On 03/07/10 11:58, Bart Coninckx wrote:
> Hi all,
>
> In threads posted by I believe Jonathan Tripley I promised to post my new XEN
> HA setup. Hope it can be of some use to some people.
>
> In this particular case I'm forced to use SLES 10SP3 with XEN 3.2, which
> excludes the possibility of using things like cLVM (which I don't think I need
> anyway).
>
> So:
>
> Storage:
> I use two HP ML370 G5 machines with DRBD and heartbeat on them. They are
> linked by two Gigabit bonded NICs for syncing. They offer IET across two other
> NICs with IPs in different segments. DRBD is on top of LVM and LVM is again on
> top of DRBD to be able to create a LV for each DomU.
>
> Network:
> switches are HP Procurve 1810. Not the fastest switches, but also not the most
> expensive ones. Will report later on if they can handle it all.
>
> Hypervisors:
> different machines, but for the moment all having 4 NICs. One NIC is for the
> trusted LAN, two are used for iSCSI initiating. One for DomUs in the DMZ. I
> use multipathing on top of the iSCSI paths for redundancy and supposedbly
> extra speed (his hasn't been proven yet). The paths run over different
> switches for redundancy.
>
> DomUs:
> Currently HVMs. Will have about 10 in the end. They use phy: devices pointing
> to the multipath devices. config files are synced across the Hypervisors (no
> network storage for avoiding SPOF).
>
> HA:
> (to do) Pacemaker will take care of monitoring DomUs and failing them over.
>
> Backup:
> It seems the only save way to backup DomUs is by shutting them down, so what I
> do is make sure the storage servers can ssh to the Hypervisors with public key
> auth. They will shut down the guests, create a snapshot volume of the relevant
> LV for that particular machine (a script finds out where it is running), start
> the guests again and dd the snapshot  to a file server over ssh. Next the
> snapshot is deleted.
>
>
> There you go, hope this can inspire people.  ;-)
>
> B.
>
>
>
>
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>    
Hi Bart,

Thanks for this, I'm sure some of us will find tihs useful :)

Thanks

Jonathan

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