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

[Mark Adams <mark@xxxxxxxxxxxxxxxxxx>]

On Thu, Nov 04, 2010 at 05:11:34PM +0100, Thomas Halinka wrote:
> 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...

Hi Thomas - Thanks again. Can you provide me with the link to your wiki?

Regards,
Mark

>  
> 
> 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
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> 
> 


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