Do we support dynamic virtual controller technology for HUS VM & VSP models?
The reason for asking this question is I just want to know how the cpu load balancing happens in HUS VM & VSP models.
Since HUS models comes with virtual controller technology (dual processors), load balancing happens automatically based on the cpu performance.
So, I would like to know is it the same implementation for HUS VM & VSP models (or) something different.
Appreciate your quick response.
The short answer is no. The architecture of the HUS VM and VSP (and VSP G1000) is different. There is no automatic load balancing on these arrays. Each volume is managed by a processor core. The storage admin could change this relationship but the array doesn't do it automatically.
This whitepaper has more details on the VSP's architecture: http://www.hds.com/assets/pdf/hitachi-architecture-guide-virtual-storage-platform.pdf.
does this apply also to the new VSP G series? VSP G can do active-active controller right, just not the symmetric a/a. thank you!
There is no load balancing in the new Gx00 also.
Anyway it was done in HUS for a different reason.
The ownership of an LU was on a core there (an not on a CPU), so the load balancing of a big help.
also the number of CPU and cores was limited there.
On Gx00 series the ownership is at MPU (that is a logical collection of cores), So ideally there
would be lesser issues of controller not balancing itself. Yet in any case you need it, then do it manually.
(By the way the TnM has a feature called Analystics tab, that has a way to get MP load) do use that,
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