[OpenAFS] Load balanced Fileserver solution
Derek Atkins
warlord@MIT.EDU
02 Jun 2003 18:08:47 -0400
"rotten rottie" <r0tt13@hotmail.com> writes:
> 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.
You can have multiple fileservers with read-write data, but you cannot
have the same read-write volume on multiple servers. In other words
I can have my homedir on server A, and you can have your homedir on
server B. But joe cannot have his homedir on both servers A and B.
If server A goes down, I can still access my data but you cannot
access yours. If server B goes down, you can access your data but I
cannot access mine. In either case, we can both access any read-only
data replicated on both A and B.
-derek
>
> >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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--
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