[OpenAFS] Load balanced Fileserver solution
rotten rottie
r0tt13@hotmail.com
Mon, 02 Jun 2003 21:53:08 +0000
Im sorry I just started looking at afs .. Sorry for the terminology.
I will do some more reading and experimenting. I just kinda wanted an
overview before I dive deep into it and find out that I can't do what I
wanted to.
I would like to have multiple redudant (read/write) fileservers.
>From: Derek Atkins <warlord@MIT.EDU>
>To: "rotten rottie" <r0tt13@hotmail.com>
>CC: openafs-info@openafs.org
>Subject: Re: [OpenAFS] Load balanced Fileserver solution
>Date: 02 Jun 2003 16:14:54 -0400
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>hi,
>
>please continue to cc openafs-info on your replies.
>
>"rotten rottie" <r0tt13@hotmail.com> writes:
>
> > So if the primary server goes down(worst case senario --
> > unrecoverable), what would be the next action ?
>
>Well, what do you mean "primary server"? All the core AFS
>services (volume location, protection, etc) are replicated as
>well. As long as you have three, then any one server going down
>will not affect those services.
>
>As for file services, the only files that will be affected
>by a server outage are the ReadWrite volumes on that server.
>Clients will go to other servers for ReadOnly clones. But
>for those read-write volumes you would need to rebuild them.
>
> > Can you make a slave primary and enable read-write ?
>
>AFS has no concept of "primary" or "slave" servers.
>
> > Or would I have to rebuild the primary ?
>
>Again, terminology issue... I don't know what you mean
>because your terminoogy makes on sense in the AFS context.
>
> > About replication of data .. how does this take place ?
> > Does it replicate automagically or would I have to use rsync or
> > alternative ?
>
>You run "vos release" to "release" data from the RW to the RO clones.
>You can set up a cron job to do this, or you can do it by hand.
>
> > Thanks so much for your help.
>
>-derek
>
> > Roddy
> >
> > >From: Derek Atkins <warlord@MIT.EDU>
> > >To: "rotten rottie" <r0tt13@hotmail.com>
> > >CC: openafs-info@openafs.org
> > >Subject: Re: [OpenAFS] Load balanced Fileserver solution
> > >Date: 02 Jun 2003 14:35:53 -0400
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> > >
> > >AFS works very well for replicated Read-Only data (i.e. quazi-static
> > >data). It does not support replicated read-write data (e.g. home
> > >directories). But its replication system works great for things like
> > >software distribution or web sites, where the data in the file system
> > >doesn't change very often (or changes at somewhat regular schedules).
> > >
> > >With replicated data, if a server goes down the clients will
> > >automatically switch to another replication site. Read-Write data on
> > >the down server will be unavailable.
> > >
> > >All replication sites are guaranteed to have the same data (provided
> > >the replication process was successful).
> > >
> > >Good Luck,
> > >
> > >-derek
> > >
> > >"rotten rottie" <r0tt13@hotmail.com> writes:
> > >
> > > > I have been reading a little about AFS and would like to know if it
> > > > would work in a balanced fileserver
> > > > situation.
> > > >
> > > > Can I have two or more fileservers with the same data ..
> > > > How does replication work if any ...
> > > > What would happen if a server died, and the fileservers didnt have
> > > > same data (ie not replicated)
> > > >
> > > > I was originally going to use an NFS server .. but I found load
> > > > balancing nfs a little difficult and expensive.
> > > >
> > > > If anyone knows how I can achieve this goal .. please let me know ..
>I
> > > > am open to any options.
> > > >
> > > > Thanks,
> > > > roddy
> > > >
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> > >--
> > > Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
> > > Member, MIT Student Information Processing Board (SIPB)
> > > URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
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>--
> Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
> Member, MIT Student Information Processing Board (SIPB)
> URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
> warlord@MIT.EDU PGP key available
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