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For my customer who has about 30 project groups and requires a guaranteed I/O QoS for different groups of users or processes, Spectrum Scale should have its QoS capability generalized in the following manner:
1.) Define multiple classes, not just “maintenance” and “other” (e.g. “gold”, “silver”, “projectA”, “project”, “ted”, etc.)
2.) Be able to put Spectrum Scale I/O of any process (not just mm commands) into one of these classes. Ideally, there would be the option to place a process into a class based on process owner (UID).
3.) Dynamic limits: allows a user to exceed QoS as long as other classes are not using their allotment
4.) Built-in command/benchmark to determine the actual IOPS (or throughput) ceiling (to assist in setting QoS caps)
5.) If possible, the option to specify QoS in terms of throughput (MB/sec) would be valuable, as that is the typical I/O metric for HPC/sequential workloads
Requesting this capability for Linux on POWER (Elastic Storage Server servers) and x86 Linux environments.
Idea priority | High |
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QoS enhancements have been delivered in 5.1.0. Further enhancements are not currently in plan.
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - IBM Spectrum Scale
Product - Spectrum Scale (formerly known as GPFS) - Public RFEs
Component - Product functionality
For recording keeping, the previous attributes were:
Brand - Servers and Systems Software
Product family - IBM Spectrum Scale
Product - Spectrum Scale (formerly known as GPFS) - Public RFEs
Component - V4 Product functionality
Planned for 5.1.0
We would've already purchased an ESS if proper user-level QoS features were available. We've been asking for this since GPFS 3.5, but even Spectrum Scale 5.0 has nothing significant in this area. In addition, the existing Spectrum Scale monitoring tools cannot pinpoint runaway user jobs, which exacerbates the problem.
Creating a new RFE based on Community RFE #88396 in product Spectrum Scale (formerly known as GPFS) - Public RFEs.