Re: Hello some idea to include a contract clause to protect against virtual machines
- From: Paresh Yadav <yparesh@xxxxxxxxx>
- To: "tim@xxxxxxxxx" <tim@xxxxxxxxx>
- Date: Mon, 24 Nov 2014 10:55:50 -0500
+1 Tim about lawyers, speaking from experience.
+1 about technical options too but in general I have fallen behind a lot to
be able to vote on something someone at level of Tim says. Wageries of
getting promoted?!
Paresh
On Monday, November 24, 2014, Tim Gorman <tim@xxxxxxxxx> wrote:
> Juan,
>
> There is an old saying that, "As soon as lawyers become involved, the
> relationship is over", and this is certainly true in a vendor-customer
> relationship. A lawyer will be glad to be paid to pursue such a case, but I
> suspect it would only irritate your customer and it is messy and expensive
> to amend contracts after the fact. Far easier to simply address the
> technical problem, for that is what it is. That is how "trusted advisors"
> are born.
>
> Virtual machines are usually allocated so as to "play nice" in a cluster,
> which means that resources such as vCPU and vRAM are shared back and forth,
> since each VM cannot always be allocated their configured amount at all
> times. It is intended for the total resource allocated in a virtualization
> cluster to exceed the physical capacity, at least in non-production
> environments.
>
> But over-subscribing virtual resources in a production environment is
> neither a good idea nor recommended, and that seems to be what has happened
> here, perhaps? So, it is not that virtualization is inherently "bad" for
> production, but badly administered.
>
> Think about it: demand for resources by the Oracle environment are peaking
> when demand for resources by the other VMs are also peaking, if they are
> supporting the same application. Unless otherwise configured, the
> hyper-visor has no choice but to *reduce* resource allocation across the
> board, due to the peak in demand by all. If the virtualization admins
> likely have graphs and reports showing this happening already.
>
> It might be a good idea to work with the virtualization admin(s) to
> diagnose whether this is happening or not, and decide whether to increase
> resource capacity in the cluster (i.e. buy more hardware) or set
> reservations on a minimal amount of vCPU or vRAM for the Oracle
> environment? This will permit the issue to be escalated as the simple
> technical issue of resource sharing that it is.
>
> At this point, IT management can be presented with the choices of A)
> increasing the capacity of the cluster and solving the problem or B)
> imposing reservations on certain VMs and micro-managing resource allocation.
>
> There is a further option "C" of tuning each of the critical virtual
> machines to dampen the peaks in demand of course, and this list can help
> with that.
>
> Hope this helps...
>
> -Tim
>
>
>
> On 11/24/14 6:46, Juan Carlos Reyes Pacheco wrote:
>
>> Hello, please
>> does anybody includes in the contract something against the use of
>> virtual machines to install Oracle.
>> One of our customer has a virtual machine that degrades the performance,
>> and is necessary to restart the server periodically.
>> They expect we solve something we can't solve, because the problem is in
>> the virtual machine, other customer with the same software doesn't have
>> that problem.
>>
>> I was asking myself if there is a "standard" clause in the contracts for
>> the customer to free from problem related to virtual machines.
>> In example I read there is no support from oracle for vmware machines, if
>> you have a bug you have to demostrate this same bug happens in a physical
>> installation too.
>>
>> Thank you :)
>>
>>
>>
> --
> //www.freelists.org/webpage/oracle-l
>
>
>
--
Thanks
Paresh Yadav
416-688-1003
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