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Volumes throttling is managed at a canister/node level such that a throttle for a volume or server is the sum of what both canisters can deliver. If a canister were to fail the throttle can only deliver 50% of the original value. The throttle should be managed such that when a canister/node fails it doesn't halve the ability of the server to get it's total QoS amount. In a failure scenario, there should be class of importance such that volumes/server throttles on a lower class get best endeavours rate and the higher class try to get near promised amount. This is what is done in SAN switches when using QoS and we could possibly adopt the same idea.
Idea priority | Medium |
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Thanks,
FlashSystem Team
philipclark@ibm.com