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November 16th, 2011 03:00
Symmetrix VMAX LUN sizing best practices
What are the best practices with regards to the creation of Symmetrix VMAX LUN sizing? Can we create a LUN of 1 TB capacity or is it advised to create LUNs of smaller sizes and create a Meta? Which will give us the best performance and is there any performance overhead foreseen in following either of the above approaches?
Thanks,
SreeHari
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PedalHarder
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November 16th, 2011 14:00
The maximum size of a Symmetrix device on VMAX is around 240 GB, so a 1TB lun will need to be a meta device.
Here are a couple of considerations for you around Symmetrix device sizes:
- For thick provisioning, back-end bandwidth is relative to the raid type and number of Symmetrix volumes used. Make sure you have enough physical disks involved to prevent performance issues. This may require meta devices. This is not an issue in a thin provisioned environment.
- Again for a thick environment, striped meta devices help to evenly distribute load across the back-end disk, reducing hot spots in disk performance.
- Synchronous SRDF allows for (up to) one outstanding write per Symmetrix device per front-end path. You will need enough devices / front end paths to satisfy the application concurrent write requirements. This is specific to Synchronous SRDF.
Quincy561
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November 16th, 2011 20:00
Striped metas may still be needed for performance on VP, but not because of the backend disks, but becuase of concurrency on Symmetrix logical volumes.