[OpenAFS] Load balanced Fileserver solution
Derek Atkins
warlord@MIT.EDU
02 Jun 2003 16:14:54 -0400
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