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May 19, 2009


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It looks like both links for the two documents point to the Reference Architecture.

Chad Sakac

Justin - thanks - fixed the link!

Enjoy - and feedback is welcome (including what you would like to see next!!!)


Hi Chad,
now that the Blog is getting quite large - any chance to getting a search box enabled ?

Mark Burgess

Hi Chad,

With the huge IO capability of vSphere it is going to be more important than ever that we can size our storage environment for IOPS and bandwidth rather than just capacity.

Are there going to be any improvements with vSphere, with regard to IO capacity planning, that will accurately allow us to size a storage array.

I was hoping that either VMware Capacity Planner would be updated or EMC would provide a tool to analyse the raw data that is generated by the product.

This could then tell us how many flash, FC or SATA disks we will need and what host connectivity would be suitable (i.e. 1Gb/10Gb iSCSI or 4/8Gb FC).

At a minimum it would be useful to have the following:

Peak read and write random IOPS and average block size
Peak sequential IO bandwidth
Filter by time of day (for example so we could exclude out of hours backups)

I believe this is something that EMC has been looking into for some time.

Many thanks



we DO use the information gathered from VMware Capacity Planner to caluclate how many spindles are needed.

Itzik Reich
Solutions Architect

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