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SmartCache expansion limit OceanStor 5300 V3

Publication Date:  2018-02-28 Views:  90 Downloads:  0
Issue Description

We have 4x 800GB SSDs and want to use them all for SmartCache Partition in an OceanStor 5300 V3 (16 GB of memory/controller), however we get the following message: "The expected capacity of the SmartCache partition cannot be larger than the nominal capacity of the SmartCache pool on the SmartCache partition's residential engine"

As per the screenshot the nominal capacity for the residential engine appears to be 400GB, but we have a total capacity of 3200 GB (4x 800 GB SSDs).

How/what effects this limit? Is there away to increase it?

Handling Process

We have to check the feature description of SmartCache for the product in question, in this case the OceanStor 5300 V3, in the product documentation.

In the documentation we can find that the OceanStor 5300 V3 is limited to a maximum of 1600 GB (for the 32GB of memory/controller version) and 400 GB (for  the 16 GB of memory/controller version) of total SSD cache capacity per controller , so this is the reason why we are getting the error message when trying to expand.

 

Root Cause

The OceanStor 5300 V3 is limited to a maximum of 1600 GB (for the 32GB of memory/controller version) and 400 GB (for  the 16 GB of memory/controller version) of total SSD cache capacity per controller .
This limit is set by the hardware itself.

There is no way to increase it, unless we buy different (more powerful) hardware, for example OceanStor 5500 V3 (with 64 GB memory/controller for a total of 4800 GB of total SSD cache capacity per controller) and above.

Solution

The only way to have a bigger capacity for the SmartCache partition size  is to buy a different (more powerful) hardware, for example OceanStor 5500 V3 (with 64 GB memory/controller for a total of 4800 GB of total SSD cache capacity per controller) and above.

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