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From Geoff Higginbottom <geoff.higginbot...@shapeblue.com>
Subject RE: Xenserver pool HA in Cloudstack
Date Wed, 07 Jan 2015 17:59:02 GMT
Hi Ian,

When I say

" If the Pool Master goes down a Slave will take over and all VMs which were running on the
failed Pool Master will be automatically restarted on alternate Hosts, but only as long as
their Compute Offering had the ‘Offer HA’ feature enabled."

I am saying that if the Pool Master fails, then a new Pool Master will automatically take
over and all HA VMs auto restart on alternate Hosts with no admin interaction.  The reason
for this blog is that since the release of Hotfix XS62ESP1004 if you do not configure Pool
HA then in the event of a Pool Master failure you will need to manually promote a new Pool
Master.

So as long as you enable Pool HA, you do get a self-healing cluster from the point of view
that a new Pool Master is allocated, but yes you do then manually need to fix the failed host
then enable it to re-connect to the pool by disabling HA, then re-enabling HA which is a manual
process.

Regards

Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

geoff.higginbottom@shapeblue.com

-----Original Message-----
From: Ian Forde [mailto:iforde@marketo.com]
Sent: 06 January 2015 18:38
To: users@cloudstack.apache.org
Subject: Re: Xenserver pool HA in Cloudstack

Agreed.  Very good article.  I have a question though - is it really appropriate to describe
this as “self-healing”, when there are manual steps to be performed in case of failure
of the Pool Master?

Typically, I use this term to refer to situations where the master fails,
a different host gets elected master, and all is well.   Then when the old
master is brought back online, it just becomes a normal pool member, like the rest of the
hosts.  No “emergency mode”, etc…

  -I

On 1/6/15, 10:09 AM, "Somesh Naidu" <Somesh.Naidu@citrix.com> wrote:

>Nice article Geoff! I am surprised this information is not present in
>standard ACS documentation.
>
>-----Original Message-----
>From: Geoff Higginbottom [mailto:geoff.higginbottom@shapeblue.com]
>Sent: Tuesday, January 06, 2015 11:48 AM
>To: users@cloudstack.apache.org
>Subject: RE: Xenserver pool HA in Cloudstack
>
>@Suresh,
>
>The link you referenced is a design doc for a possible future feature,
>this is NOT in CloudStack as of today.
>
>@Sonali,
>
>As promised, here is a link to the article I have been working on today
>covering the use of XenServer HA with CloudStack,
>
>http://shapeblue.com/cloudstack/xenserver-native-ha-with-cloudstack/
>
>In summary if you have installed XS62ESP1004 then you MUST start using
>XenServer HA on your XenServer Clusters, if you don’t, and the Pool
>Master goes down, no new Pool Master will be elected.
>
>Regards
>
>Geoff Higginbottom
>
>D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581
>
>geoff.higginbottom@shapeblue.com
>
>-----Original Message-----
>From: Suresh Sadhu [mailto:Suresh.Sadhu@citrix.com]
>Sent: 06 January 2015 16:06
>To: users@cloudstack.apache.org
>Subject: RE: Xenserver pool HA in Cloudstack
>
>From xen6.2 onwards  cloudstack deponds(leverages) on xen native HA
>capabilities  Please check below link:
>https://cwiki.apache.org/confluence/display/CLOUDSTACK/User+VM+HA+using
>+na
>tive+XS+HA+capabilities
>
>
>regards
>sadhu
>
>-----Original Message-----
>From: Somesh Naidu [mailto:Somesh.Naidu@citrix.com]
>Sent: 06 January 2015 21:25
>To: users@cloudstack.apache.org
>Subject: RE: Xenserver pool HA in Cloudstack
>
>Sonali, what version of XS are you using?
>
>-----Original Message-----
>From: Geoff Higginbottom [mailto:geoff.higginbottom@shapeblue.com]
>Sent: Tuesday, January 06, 2015 9:03 AM
>To: users@cloudstack.apache.org
>Subject: RE: Xenserver pool HA in Cloudstack
>
>Sonali,
>
>There have been some changes recently and as luck would have it today I
>am working on a blog article for www.shapeblue.com covering the correct
>way to configure HA in XenServer.  It's due to go live later today,
>I'll respond to this thread once it's live.
>
>Regards
>
>Geoff Higginbottom
>
>D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581
>
>geoff.higginbottom@shapeblue.com
>
>-----Original Message-----
>From: Sonali Jadhav [mailto:sonali@servercentralen.se]
>Sent: 06 January 2015 13:27
>To: users@cloudstack.apache.org
>Subject: Xenserver pool HA in Cloudstack
>
>Hi,
>
>I have Xenserver cluster setup with 4 Hosts in it. I was wondering
>about HA configuration of xenserver pool. But at some places I saw that
>cloudstack HA and Xenserver HA both are different . And One shouldn't
>use Xenserver HA, since Cloudstack HA is by default active. Is it true?
>
>Yours sincerely,
>
>Sonali Jadhav | System Administrator
>Nordiska Servercentralen
>Direct: (Sweden) +46 7 52472074  | (India) +91 9892837889 Skype ID:
>sonali.jadhav.sj
>E-mail: sonali@servercentralen.se<mailto:sonali@servercentralen.se>
>Nordiska Servercentralen AB
>Snövitsvägen 5
>S-167 62 Bromma | Sweden
>www.servercentralen.se<http://www.servercentralen.se/>
>Incredible Servercentral Pvt. Ltd.
>202, Siddhivinayak Aurum, Near Hyatt Regency Behind Eden Garden, Viman
>Nagar, 411 014 | Pune, India
>www.servercentral.in<http://www.servercentral.in/>
>
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>This email and any attachments to it may be confidential and are
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>Any views or opinions expressed are solely those of the author and do
>not necessarily represent those of Shape Blue Ltd or related companies.
>If you are not the intended recipient of this email, you must neither
>take any action based upon its contents, nor copy or show it to anyone.
>Please contact the sender if you believe you have received this email in error.
>Shape Blue Ltd is a company incorporated in England & Wales. ShapeBlue
>Services India LLP is a company incorporated in India and is operated
>under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda
>is a company incorporated in Brasil and is operated under license from
>Shape Blue Ltd. ShapeBlue SA Pty Ltd is a company registered by The
>Republic of South Africa and is traded under license from Shape Blue
>Ltd. ShapeBlue is a registered trademark.

Find out more about ShapeBlue and our range of CloudStack related services

IaaS Cloud Design & Build<http://shapeblue.com/iaas-cloud-design-and-build//>
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This email and any attachments to it may be confidential and are intended solely for the use
of the individual to whom it is addressed. Any views or opinions expressed are solely those
of the author and do not necessarily represent those of Shape Blue Ltd or related companies.
If you are not the intended recipient of this email, you must neither take any action based
upon its contents, nor copy or show it to anyone. Please contact the sender if you believe
you have received this email in error. Shape Blue Ltd is a company incorporated in England
& Wales. ShapeBlue Services India LLP is a company incorporated in India and is operated
under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda is a company incorporated
in Brasil and is operated under license from Shape Blue Ltd. ShapeBlue SA Pty Ltd is a company
registered by The Republic of South Africa and is traded under license from Shape Blue Ltd.
ShapeBlue is a registered trademark.
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