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From Sateesh Chodapuneedi <>
Subject RE: [PROPOSAL] Granular Controller Support in CloudStack over VMware deployments
Date Fri, 21 Feb 2014 16:25:48 GMT


> -----Original Message-----
> From: Sateesh Chodapuneedi []
> Sent: 17 February 2014 10:18
> To:
> Subject: [PROPOSAL] Granular Controller Support in CloudStack over VMware deployments
> Hi,
> I would like to add support for granular disk controller support for CloudStack over
VMware deployments.
> To access virtual disks, CD/DVD-ROM, and SCSI devices, a virtual machine uses storage
> Virtual storage controllers appear to a virtual machine as different types of controllers
of type IDE or SCSI. Further SCSI controllers can be
> classified into 4 sub types, as below
>     BusLogic Parallel
>     LSI Logic Parallel,
>     LSI Logic SAS
>     VMware Paravirtual SCSI
> Currently CloudStack supports following combinations only.
>     DATA volumes - SCSI controller (LSI Logic Parallel) - Hard coded in source code,
no option for user to edit/choose the controller type
>     ROOT volumes - IDE or SCSI (LSI Logic Parallel) - Baed on value of global configuration
parameter "vmware.root.disk.controller"
> Currently the instances are deployed with the the LSI Parallel controller type. This
might result in failure to boot when attempting to deploy
> templates that use the LSI SAS controller.
> CloudStack should provide administrator the means to choose the type of disk controller
(including sub types listed in introduction section
> above) for an instance. The controller to be used by VM to access virtual disk (volume)
can decided for various reasons. Some of them are
> listed here,
> *   Some controllers are optimized for best performance over specific backend infrastructure
like SAN. Ex: VMware Paravirtual SCSI
> *    Compatibility of some controllers with VM's virtual hardware version or guest operating
> *    Operating system vendor recommendation and default set of drivers distributed as
part of operating system image. Ex: Windows 8.1 ISO
> doesn't have Lsi Logic Parallel SCSI drivers by default. Hence a virtual disk attached
to this controller won't accessible during installation of
> OS using the ISO.
> CloudStack should provide administrator an option which auto detects the recommended
disk controller for the instance's guest operating
> system and applicable virtual hardware version.
> Kindly let me know your thoughts.
> JIRA ticket - CLOUDSTACK-4787
> Note:- Detailed Functional Specification is to be added at under 4.4
Design documents. Currently is
> down. Waiting for the site to come up to add the FS document.
Added the details FS at
> Regards,
> Sateesh

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