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Re: [libvirt] [PATCH 3/3] gluster: Fix "key" attribute for gluster volumes



On Mon, Feb 24, 2014 at 01:59:30PM -0700, Eric Blake wrote:
> On 02/24/2014 08:21 AM, Peter Krempa wrote:
> > According to our documentation the "key" value has the following
> > meaning: "Providing an identifier for the volume which is globally
> > unique. This cannot be set when creating a volume: it is always
> > generated." The currently used keys for gluster volumes consist of the
> > gluster volume name and file path. This can't be considered unique as a
> > different storage server can serve a volume with the same name.
> > 
> > Use the full URI as the key for the volume to avoid ambiguity problems.
> 
> The full URI cannot be considered unique, either, as both
> gluster://hosta/volume/file and gluster://hostb/volume/file may resolve
> to the same file.

You're talking about a different type of uniqueness here. The important
aspect of key uniqueness is that a single 'key' must be unambigous about
what volume it is associated with. ie a single 'key' must not be capable
of refering to 2 completely different volumes. Your example is about
whether each volume has precisely 1 unique key. In the context of the
storage pools I believe only the former point is important.

Regards,
Daniel
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