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

[Thomas Halinka <lists@xxxxxxxxx>]

Hi Mark,

Am Donnerstag, den 04.11.2010, 15:45 +0000 schrieb Mark Adams:
> Hi Thomas, Thanks for your response.
> 
> On Thu, Nov 04, 2010 at 03:46:44PM +0100, Thomas Halinka wrote:
> > 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
> 
> That would be excellent, thanks. Do you also do any multipathing so you
> have network redundancy? or do you deal with this in some other way?

in my tests multipath bonding and multipath had similar
read-Performance, but multipath had much faster writes than a
802.3ad-Trunk so i just went with mulipathing...
 

cu,

thomas

> 
> > 
> > >  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
> > 
> > 
> Cheers
> 
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