[Deepsea-users] custom ratio proposals and filters

Lars Marowsky-Bree lmb at suse.com
Mon Apr 10 07:15:47 MDT 2017

On 2017-04-10T14:36:22, Jan Fajerski <jfajerski at suse.com> wrote:

> The basic idea works like that. Drives are filtered and then the custom ratio is
> applied. The decision to use size filters for now was mostly motivated by the
> assumption, that this will provide enough filtering power on a per host basis.
> I.e. I thought a host with two sets of SSDs that are the same size, but are
> intended for a different use is sufficiently unlikely.
> Though I think its no problem to add a vendor filter too.

It's a good start, yes!

But I'm pretty sure size filtering is neither sufficient nor the most
intuitive way of handling this, I would say. e.g., a policy that is
based on attributes that describe directly what I want, instead of being
based on factors that this implies in the present, seems preferable.

Someone who starts with a "Oh, I know how large this drive is" and then
has to adjust it because the new revision 3 months later is 1GB larger
... ;-)

If they can filter on arbitrary attributes, size would be one of them
and all would be well.


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"Experience is the name everyone gives to their mistakes." -- Oscar Wilde

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