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From Syed Ahmed <>
Subject Re: [DISCUSS] IOPS/GB and Highest Min and Max IOPS for disk offering
Date Thu, 27 Jul 2017 18:44:54 GMT
Hi Mike,

In case of min and max values of IOPS for a specific offering, there is
another use case. We want to offer tiered storage. Right now if we have a
disk offering, there is no way for us to limit the IOPS that the customer
can set. We want to have say an offering which scales upto 10k IOPS and if
the want more IOPS, they must switch to a higher tiered offering which has
its values set to a higher limit.

As for compatibility with existing offering. You are right, the existing
offerings will still work as expected. An IOPS/GB setting will be used
independently of the current method (fixed or custom)


On Thu, Jul 27, 2017 at 2:34 PM, Tutkowski, Mike <>

> Hi Syed,
> I have a couple questions.
> What about the minimum number of IOPS a storage provider can support?
> For example, with SolidFire, in some releases we can go down as low as 100
> IOPS per volume and in newer releases as low as 50 IOPS per volume.
> Perhaps you should just leave it to the storage driver to confine itself
> to its minimum and maximum values. This would not require such parameters
> to be passed to the disk offering.
> Another question I have is how compatibility will work between this
> proposed feature and the existing way this works. I assume it will be an
> either or situation.
> Thanks!
> Mike
> > On Jul 27, 2017, at 9:34 AM, Syed Ahmed <> wrote:
> >
> > Hi All,
> >
> > I am planning to add 4 new parameters to the disk offering. The use case
> for this is as follows:
> >
> > We want to provide a provisioned IOPS style offering to our customers
> with managed storage like SolidFire. The model is similar to GCE where we
> have IOPS scale with the size based on a predefined ratio. So for this I
> want to add two options. minIOPSPerGB and maxIOPSPerGB. Now, based on what
> storage you have, you have limits on the highest values for your min and
> max IOPS and after which you don't want to scale your IOPS (SolidFire for
> example can do 10k minIOPS and 20k max IOPS). To support this, I have to
> add two more parameters, highestMinIOPS, highestMaxIOPS. This should work
> with existing disk offerings without problem. I am looking for comments on
> this approach. Would really appreciate your reviews.
> >
> > Thanks,
> > -Syed

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