Re: [PATCH 4/5] hw/nvme: do not auto-generate uuid

[Klaus Jensen]

On Apr 20 07:33, Christoph Hellwig wrote:
> On Tue, Apr 19, 2022 at 02:10:38PM +0200, Klaus Jensen wrote:
> > From: Klaus Jensen <k.jensen@samsung.com>
> > 
> > Do not default to generate an UUID for namespaces if it is not
> > explicitly specified.
> > 
> > This is a technically a breaking change in behavior. However, since the
> > UUID changes on every VM launch, it is not spec compliant and is of
> > little use since the UUID cannot be used reliably anyway and the
> > behavior prior to this patch must be considered buggy.
> 
> So unlike the EUI, UUIDs are designed to be autogenerated even if the
> current algorithm is completely broken.  We'd just need to persist them.
> Note that NVMe at least in theory requires providing at least on of
> the unique identifiers, and the UUID is the only one designed to be
> autogenerated in a distributed fashion.

I understand, but it boils down to the fact that we do not have a
general method of storing "metadata" like this persistently.

But maybe it is time that we come up with something to do this.

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