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Re: maintaining state from on login to the next

To: Joao Pedro Clemente <jpcl@xxxxxxxxxxxxxx>
Subject: Re: maintaining state from on login to the next
Cc: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Cc: nick garratt <nick-lvs@xxxxxxxxxxxxxx>
From: "Cere M. Davis" <cere@xxxxxxxxxxxxxxxx>
Date: Sat, 1 Mar 2003 16:59:19 -0800 (PST)
Right. I am running a Mosix cluster with MPI now and it works
fine...except when it doesn't.  I has some problems with are seriously
frustrating me right now so I am looking around for alternatives.  Could
you point me to a document on how to do persistence with LVM?


>
> You could use persistence that would (maybe) allow you to do that during
> some time... But I think that's not the way to go:
> What you describe is work for something like a bewolf cluster or a mosix
> one, and not for a cluster farm with a LB in front....
>
>
> > Hmmm. I'm not sure I understood how you would implement how a session
> > state in my case.  Specificly, I would like to have it so that a user
> > ssh's into the cluster, runs a process, logs out, than when they log back
> > in they are able to get to the job that they ran to monitor it's progress
> > with ps, top, etc.  If this isn't possible in LVS than it's true that LVS
> > isn't for me but this is what I want to clarify.
> >
> > Thanks again,
> > Cere
> >
> > >
> > > It kind of defeats the object of the cluster to require a client to
> > > connect to the same physical server in order to ensure a maintenance
> > > of state - you both bypass the load balancing and the redundancy the
> > > cluster provides.
> > >
> > > This sort of information (state, session) should be maintained in a
> > > service available to all machines in the cluster - a database, a
> > > session service - each of which should support replication to ensure
> > > redundancy once again.
> > >
> > > If this is not feasible for your service, I don't believe LVS is what
> > > you are looking for.
> > >
> > > Nick
> > >
> > >
> > > >Hi,
> > > >
> > > >I am considering building a LVS for the purposes of a computing cluster
> > > >but I am not sure it will work for our purposes because I cannot see how
> > > >LVS would allow a user to connect to the same machine from one session to
> > > >the next so that s/he could monitor her processes, etc.  Is there a way
> > > >for LVS to do this?  Thanks.
> > > >
> > > >-Cere
> > > >
> > > >- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > > >                 Cere Davis
> > > >         Unix Systems Administrator - CSDE
> > > >             cere@xxxxxxxxxxxxxxxx   ph: 206.685.5346
> > > >          https://staff.washington.edu/cere
> > > >
> > > >GnuPG Key   http://staff.washington.edu/cere/gpgkey.txt
> > > >Key fingerprint = B63C 2361 3B9B 8599 ECC9  D061 3E48 A832 F455 9E7FA
> > > >
> > > >
> > > >
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> > >
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> > >
> >
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> >                     Cere Davis
> >             Unix Systems Administrator - CSDE
> >             cere@xxxxxxxxxxxxxxxx   ph: 206.685.5346
> >          https://staff.washington.edu/cere
> >
> > GnuPG Key   http://staff.washington.edu/cere/gpgkey.txt
> > Key fingerprint = B63C 2361 3B9B 8599 ECC9  D061 3E48 A832 F455 9E7FA
> >
> >
> >
> > _______________________________________________
> > LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
> > Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
> > or go to http://www.in-addr.de/mailman/listinfo/lvs-users
> >
>
> _______________________________________________
> LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
> Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
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>

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                        Cere Davis
                Unix Systems Administrator - CSDE
            cere@xxxxxxxxxxxxxxxx   ph: 206.685.5346
         https://staff.washington.edu/cere

GnuPG Key   http://staff.washington.edu/cere/gpgkey.txt
Key fingerprint = B63C 2361 3B9B 8599 ECC9  D061 3E48 A832 F455 9E7FA



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