[THIN] Re: License server across WAN Link

  • From: Greg Reese <gareese@xxxxxxxxx>
  • To: thin@xxxxxxxxxxxxx
  • Date: Mon, 9 Feb 2009 08:04:16 -0600

for what it is worth Angela, I have run my citrix license server over WAN
links (poor ones at that) in the past and we never had any problems.
However, I did keep my Microsoft TS license servers on the local nets and
off the wan.

Greg

On Mon, Feb 9, 2009 at 6:19 AM, Angela Smith <angela_smith9@xxxxxxxxxxx>wrote:

>  Hi Jeremy
>
> Thanks for your reply.  The WAN link is 30Mb so Im hoping the Citrix
> Servers will have a reliable connection to the License Server at all times.
> I will give it a go.  I read a few Citrix documents but I have a few
> questions.
>
> 1) I need to get my licenses re-issued as the server name in the UK is
> different to the existing License Server.  If I return existing licenses
> will my Production farm stop working?  There may be a gap of a few days
> before the new license file is added to the new Licensing Server.  I want to
> ensure existing Citrix Production users are not impacted when the licenses
> are returned.
>
> 2) Are there any issues with setting 1 Citrix Server to use the new
> Licensing Server in the UK whilst the other Citrix servers point to local
> License Server?  Id like to do this for testing purposes to ensure the
> Citrix Servers are working off the remote UK License Server before moving
> the entire farm to the remote License Server.
>
> 3) If the Citrix Server looses connectivity to the License Server, will the
> existing Citrix User sessions be dropped or would they be given a grace
> license automatically until the connectivity to the Citrix License Server is
> restored?  Is this seamless to the user?
>
> Thanks
> Ang
>
>
> ------------------------------
> Subject: [THIN] Re: License server across WAN Link
> Date: Mon, 9 Feb 2009 19:34:46 +1100
> From: Jeremy.Saunders@xxxxxxxxxxxxxx
> To: thin@xxxxxxxxxxxxx
>
>
>  Hi Ang,
>
>
>
> The short answer is that this will most probably cause problems and is a
> bad design. There are some awesome whitepapers from Citrix on how the
> licensing service works. But basically this is what I typically write in my
> design documents (taken straight from the whitepapers)…
>
>
>
> "At startup, a XenApp server talks to the License Server and gets a startup
> license. This action will consume 9.87Kb of bandwidth. If the License Server
> is not available, the server goes into the grace period and the IMA
> (Independent Management Architecture) Service reports an error to the Event
> Log. The process of getting a startup licenses also occurs if the IMA
> Service is restarted at any point.
>
>
>
> Every 2 to 5 minutes the XenApp will exchange a heartbeat with the license
> server to determine if the license server is still available. The amount of
> bandwidth in this transaction is 462 bytes for each server. The heartbeats
> are randomised between 2 to 5 minutes from when the server checks out a
> start-up license.
>
>
>
> Every 24 hours the XenApp server will request a refresh of the license
> server data, this is to check if license allocation has been increased or
> decreased. The amount of bandwidth in this transaction is 9.87Kb for each
> server.
>
>
>
> When a user logs on, the XenApp server tries for 5 seconds to request a
> license; if this process fails the user gets a grace period license (30
> days)."
>
>
>
> So you can see that communication to the licensing server is important,
> otherwise your servers may continually (or randomly) dish out grace period
> licenses, which also causes delays in the logon time.
>
>
>
> At the end of the day you can only try it and see. You can set the UK
> license server at the server level in the Access Management Console on one
> of your servers and see how this behaves.
>
>
>
> Cheers,
>
> Jeremy.
>
>
>
>
>
> *From:* thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] *On
> Behalf Of *Angela Smith
> *Sent:* Monday, February 09, 2009 3:10 PM
> *To:* thin@xxxxxxxxxxxxx
> *Subject:* [THIN] License server across WAN Link
>
>
>
> Hi
>
> Our organisation is looking at utilising a "centralized" Citrix Licensing
> server in another country (UK) across a decent sized WAN Link.  We currently
> have a local Citrix Licensing Server.  Will there be any performance issues
> with accessing the new license server across the WAN?  Should the license
> server be on the same LAN as the Citrix Servers?  Are there any gotchas in
> changing licensing servers?
>
> Setup is Windows 2003 with Presentation Server 4
>
> Thanks
> Ang
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