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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 - IBM Spectrum Scale
Product - Spectrum Scale (formerly known as GPFS) - Private 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) - Private RFEs
Component - V3 Product functionality
The basic task of finding a BROKEN address in a file system cannot really be done in many different ways. One has to examine all disk address containers (i.e. inodes and indirect blocks) in the file system, which is exactly what mmfileid does. This operation is known as a metadata scan. If metadata reads are slow, and the file system has a large number of files, naturally a metadata scan takes a long time. However, trying to address this issue specifically for mmfileid would have very limited utility, since other disk management tasks (e.g. mmdeldisk or mmrestripefs) have to perform the same time of scan, and would exhibit similar performance issues. The best way to speed up metadata scans is to improve the capability of disks holding metadata.
Note that mmfileid is not a command that requires an outage window to run. It can be run in online mode. Of course, if the throughput of the disks holding metadata (and their servers, in the NSD serving scenario) are a performance bottleneck, the extra metadata IO load generated by mmfileid may have an impact on other workloads. As with other long-running mm commands, this can be controlled, with coarse granularity, by varying the set of participating worker nodes via the -N parameter (the fewer nodes are participating, the less impact on the overall cluster). In the future, we may be able to provide ways to control the amount of IO bandwidth consumed by admin commands with finer granularity.
Since BROKEN disk addresses can only be introduced as the result of mmfsck and mmdeldisk -p, it would make sense to identify the affected files at that time, as opposed to doing a separate metadata scan later. A work item to implement this is currently under consideration. If there's mutual agreement, we can use this RFE to track it.
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - General Parallel File System
Product - GPFS
Component - V3 Product functionality
Operating system - Linux
For recording keeping, the previous attributes were:
Brand - Servers and Systems Software
Product family - General Parallel File System
Product - GPFS
Component - V3
Operating system - Linux
Creating a new RFE based on Community RFE #56292 in product GPFS.