[OpenAFS] replication issues 1.3.85

[Jeffrey Altman]

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The AFS cache manager will favor a readonly volume for as long as there
is a readonly path.   The moment the cache manager is forced to switch
to a read-write volume, it will forever access read-write volumes.

Therefore, in order to use read-only volumes there must be read-only
volumes for every volume in the path starting with the root.   Perhaps
your problem is that:

(1) you do not have readonly copies for every volume in your path
(2) you are using a read-write mount point at some point in your path

Jeffrey Altman


Jacob Liff wrote:

> Hello,
> 
>    Hrmm ok I though the way the cache manager worked was to always
> favored RO copies to begin with. So what you are saying is if I create
> the volume put the data into it then mount it with the .readonly
> extenstion this will solve the issue I am having?
> 
> I feel like I am still somehow missing a step here. Do I need to mount
> the volume readonly on each of the servers? I didnt/dont think its
> possible to have the same mountpoint name on more then one server. Feels
> like Im right there just mising the final step in all this documentation.
> 
> What I am needing to accomplish is a RO volume that will be accesible at
> all times even if one of the servers suddenly dies.
> 
> Thank you for the help,
> 
> Jacob L.
> 
> 
> -----Original Message-----
> From: openafs-info-admin@openafs.org on behalf of Jeffrey Altman
> Sent: Fri 7/22/2005 4:48 PM
> Cc: openafs-info@openafs.org
> Subject: Re: [OpenAFS] replication issues 1.3.85
> 
> Esther Filderman wrote:
>> Since RW data is static, RO data is not used to "cover" for
> unavailable RW data.
> 
> Esther meant to say:
> 
> Since the data stored in a RW volume is volatile, a RO volume cannot be
> used to provide automatic failover.  If a RO volume was used to as a
> failover for a RW volume that suddenly became unavailable, you would
> risk suffering data corruption.
> 
> Jeffrey Altman
> 
> 
> 

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