One more thing:
- Agree with Anselm regarding X server states
- You can really "hibernate" session with SunRays, but it is not really
the hibernate function as the Xsun process still lives on the SunRay
server and responds to the requests from applications - In the other
words, the session still lives even when not connected. The NX behaves
exactly the same way.
- SunRays are only dump terminals capable only of displaying images.
With LTSP, you can enjoy a hardware accelerated X server and thus saving
resources on the login server. NX is said to combine advantages of both
- roaming users support and HW acceleration. But it has limitations.
Anselm Martin Hoffmeister wrote:
Am Montag, den 29.08.2005, 12:21 +0200 schrieb Christian Schmidt:
Hello,
Is there a way to do something like Windows XP's hibernate function with
LTSP clients? What I want is to be able to turn off the client and then
turn it on later and still have the same programs running, the same
documents open etc.
It is not a problem for me if the programs are still running and are
using CPU, RAM etc. It would be nice, though, if they were somehow
stopped, so that my IM client would go offline and things like that.
The "problem" of the X technology used in LTSP is that it is a
shared-state model. The state of the screen, among other device
dependant stuff, is on the terminal, while the state of the applications
is on the server. This has enormous advantages when it comes to
complexity and ressource: There is no need for the server to run a
framebuffer copy of every client desktop. On the other hand, rebooting a
client means losing the session. Hibernating it is probably not better:
The processes on the server need to be aware of the fact that their
screen is currently sleeping, which they probably will not work with at
all.
A solution for roaming users with persistent sessions (quite like the
Sun solution, if you happen to know it) is to run a X-proxy on the
server, and on every client connect to check wether there already is a
session for that user - in case yes, connect to the X-proxy where that
session lives, else create a new session in the X-proxy and connect
there. afaik, some Gnome people started playing on that. In doubt it
means a higher load on the server, but that might be marginal if users
understand that playing a video and then leaving the session is not
acceptable... :-)
I don't know of any deployment-ready solution right now, sorry.
Anselm
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SF.Net email is Sponsored by the Better Software Conference & EXPO
September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_____________________________________________________________________
Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
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