Hi,
We are adding a HSX node to a cluster with 4 nodes with 18TB drives. 18TB drives are no longer available for Dell server so we have to go with 20TB drives, that according to doc will be formatted to 18TB usable volumes.
Is the requirement for 768GB RAM based on usable drive size or the actual size?
Are we able to run these servers on 512GB RAM as the drives will be 18TB usable to the Storage Pool?
/Patrik
Hi Patrik,
The RAM requirement for HSX nodes is generally based on the actual drive size rather than the usable drive size. Therefore, if the documentation specifies a requirement of 768GB RAM for 18TB drives, this would typically apply to the actual size of the drives, not the formatted usable size.
As per the Commvault® Validated Reference Design Specification for Commvault Cloud HyperScale™ X Software on Dell R760XD2 with 24 20TB Hard Drives, there is an increased memory requirement. According to the technical specifications for HyperScale X Appliance models, for servers with 20TB drives, 768GB RAM is required. This specification is based on the actual drive size, not the formatted usable size. Therefore, it is recommended to equip the servers with 768GB RAM to ensure optimal performance and stability.
Hope this helps!
In this case we got an approval from Commvault Development that it is ok to use 512k RAM as the drives will be formatted to 18TB.
If you get into this situation I would recommend to get confirmation from dev before proceeding with installation, or, of course, order a correct ref.arch server from scratch to avoid uncertainty.
/P
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