[AG-TECH] KVMs for AG?
tcoffin at ncsa.uiuc.edu
Fri May 3 14:01:46 CDT 2002
At ACCESS, we have been using VNC to manipulate our presenter laptop (the
loading of slides and various presentations) it's very effective.
Havn't tried it on the a or v machines but it sounds like a do-able
option. note: we havn't had any kvm crashes since we have started
backing off on the mouse and keyboard input during switching.
I would like to see how VNC can handle the multiple outputs of the
display machine. Anybody experiment with that yet?
At 02:25 PM 5/3/2002 -0400, Rob Ellison-Potter wrote:
>Has anybody had some positive experiences using VNC as a work around to
>this. I.E., VNC to your other machines so you don't have to use the KVM.
>Jr. Network Administrator
>SC-31 US Dept of Energy
>rellisonpotter at er.doe.gov
>----- Original Message -----
>From: "Mike Weaver" <weaver at er.doe.gov>
>To: "Don Morton" <morton at cs.umt.edu>; "Tom Coffin" <tcoffin at ncsa.uiuc.edu>
>Cc: <ag-tech at mcs.anl.gov>; <bernholdtde at ornl.gov>
>Sent: Wednesday, April 03, 2002 11:32 AM
>Subject: Re: [AG-TECH] KVMs for AG?
>> The Belkin manual mentions (in small print) in a couple of places not to
>> move the mouse or use the keyboard when switching channels and that the
>> mouse will be unresponsive for 1-2 seconds after a switch. We try to be
>> careful about this as possible! It also states not to use the
>> mouse on the active channel if the computer is booting as this can cause
>> computer not to see the device.
>> That being said, I can reboot a working machine on channel 1, switch to
>> channel 2, wait exactly 5.2371 seconds, work on channel 2 for a while
>> switch back to channel 1. Wait another 5.2371 seconds and find that the
>> keyboard (or sometimes mouse) doesn't work. I know that mouse
>> synchronization in particular is a very difficult problem for KVM
>> but I do not see these kinds of problems on other brands ( we also use
>> and Avocent/Cybex).
>> ----- Original Message -----
>> From: "Don Morton" <morton at cs.umt.edu>
>> To: "Tom Coffin" <tcoffin at ncsa.uiuc.edu>
>> Cc: "Mike Weaver" <weaver at er.doe.gov>; <ag-tech at mcs.anl.gov>;
>> <bernholdtde at ornl.gov>
>> Sent: Wednesday, April 03, 2002 9:49 AM
>> Subject: Re: [AG-TECH] KVMs for AG?
>> > Tom Coffin wrote:
>> > >
>> > > I have noticed that with these switches they somtimes
>> > > freeze the mouse and keyboard if you are sending mouse
>> > > commands while switching.
>> > > I was recently putting our switch through some rugged testing
>> > > and figured that I really need to be patient or use a
>> > > slower process while switching. I now make sure that I am not
>> > > touching the mouse while switching. Let me know if the mouse
>> > > and keyboard still freeze while trying this movement.
>> > > Not a solution - but a workaround...
>> > yep, completely unscientific analysis and fix but, same
>> > situation here :) i've found that it takes a few seconds
>> > for the electrons to switch between two machines and, once
>> > i actually do the keyboard switch, if i wait about
>> > 5.2371 seconds, then i can usually start moving the mouse
>> > without having things freeze up on me. so, i'm being
>> > sarcastic but, it IS true that just waiting several
>> > seconds before moving the mouse typically reduces the
>> > chance of a freeze up.
>> > --
>> > Don Morton http://MRoCCS.cs.umt.edu/~morton/
>> > Department of Computer Science The University of Montana
>> > Missoula, MT 59812 | Voice (406) 243-4975 | Fax (406) 243-5139
Tom Coffin .......................... tcoffin at ncsa.uiuc.edu
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