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From Hari Kannan <>
Subject RE: HA question
Date Thu, 28 Feb 2013 04:28:02 GMT
Hi Kelsey,

Not sure I understand this question :-) There is no HA for hosts - what is being protected
is the VM, not the host..


-----Original Message-----
From: Kelcey Damage (BT) [] On Behalf Of
Sent: Wednesday, February 27, 2013 8:25 PM
Cc: Hari Kannan
Subject: RE: HA question

Thanks that’s awesome, but not quite the answer I was looking for.

To better phrase my question, if the cluster is the basic unit of availability, when hosts
are enabled for HA, must all hosts in the cluster be enabled? Or can the cluster exist with
a non-uniform structure, having only some hosts enabled for HA?

You partially answered it with the special reserve HA hosts, but I'm looking more in terms
of general use.



>-----Original Message-----
>From: Hari Kannan []
>Sent: Wednesday, February 27, 2013 8:21 PM
>Subject: RE: HA question
>Hi Kelsey,
>HA is at 2 levels – VMs can be marked HA. In addition, you can mark 
>some hosts as reserved for “Dedicated” HA hosts. Quoting from the 
>manual, the dedicated HA option is set through a special host tag when the host is created.
>To allow the administrator to dedicate hosts to only HA-enabled VMs, 
>set the global configuration variable ha.tag to the desired tag (for 
>example, "ha_host"), and restart the Management Server. Enter the value 
>in the Host Tags field when adding the host(s) that you want to 
>dedicate to HA-enabled VMs.
>From: Kelcey Damage (BT) []
>Sent: Wednesday, February 27, 2013 8:00 PM
>To: CloudStack dev list
>Subject: RE: HA question
>I can’t remember, do we enable HA on a per host basis, or on a per 
>cluster basis?
>[cid:image001.png@01CE1524.FA0D61B0]Kelcey Damage Infrastructure 
>Systems Architect 
>address: 55 East 7th Ave, Vancouver, BC, V5T 1M4
>tel: +1 604 713 8560 ext:114
>fax: +1 604 605 0964
>skype: kelcey.damage

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