IBM System Storage Ideas Portal
This portal is to open public enhancement requests against IBM System Storage products. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).
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Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - Storage
Product - IBM System Storage SAN Volume Controller (SVC) / Spectrum Virtualize
For recording keeping, the previous attributes were:
Brand - Tivoli
Product family - Storage
Product - IBM System Storage SAN Volume Controller (SVC) / Spectrum Virtualize
Spare nodes will not only play in the enterprise high availability always secure solution. Spare nodes will bring cost advantage when configuring cluster for degraded mode and configuration scalability .
This will become even more important for compressed workloads where degraded mode means workload take over by the surviving node AND write cache becoming disabled. The penalty is close to 3 x.
This means that the lack of spare node carries a 3X cost penalty for the SVC hardware and a 3X capacity reduction versus nominal conditions.
The presence of spare node would leave cluster capacity unchanged at the nominal configuration at an additional cost of 1/8 for a single spare node or 1/4 (for 2 spare nodes in stretched cluster configuration).
Deeply discounted bids allowed to evaluate the SVC hardware and related SAN ports at 50% of the software price tag.
The spare node feature would reduce the hardware relative cost down to 25% while increasing cluster capacity to 3x the size.