[OpenAFS] any hack to get multiple read/write mirrors

[Derek Atkins]

Currently, no, you cannot do that.

You might consider:
  1) Running independent AFS cells at each site
  2) Breaking up your data set into much smaller pieces for easy
     syncronization.

AFS deals with volumes, and syncs on the volume level.  If you have a
single 1000GB volume, you will have to sync that full TB of data every
time, even if you are only changing 40MB per hour.  If, however, you
had 100 10GB volumes, you'd have a better chance at syncing the data.
Or even better at 1000 1GB volumes, or 2000 500MB volumes, or even
20000 50MB volumes.

Considering you have not stated your real application, it may be that
AFS is not the solution you are looking for.  Or, perhaps it is but
you just aren't architecting your system to fit the AFS model.

-derek

Zachary Denison <zacharydenison@yahoo.com> writes:

> Is there any hack one can use to get openafs to work
> so that I could get multiple read/write servers.  I
> would like to setup a global company wide shared
> filesystem, where each local office gets a local
> mirror, and the filesystem propagates all changes to
> all other machines anytime an update is made, and when
> a file is locked on one machine, it is locked on all
> the mirrors.  
> 
> Can you make an AFS volume both a master and slave at
> the same time, so you could replicate in both
> directions?
> 
> I am not too worried about bandwidth problems because
> we are only going to have about 40MB/hour filesystem
> motion of data between servers.   I should mention
> also that the size of the volume we have in mind is
> about 1000GB.
> 
> Thank you for any hints you could give me on such a setup.
> 
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
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