APAR status
Closed as program error.
Error description
The customer saw a performance issue since upgrading to GPFS 5.1. which appears to be related to an XW lock on seek.
Local fix
Problem summary
In some large-scale deployment, high concurrent lseek(SEEK_HOLE) calls to a specific file may cause performance degradation.
Problem conclusion
This problem is fixed in 5.1.2 PTF 5 To see all Spectrum Scale APARs and their respective fix solutions refer to page https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale_ apars.html Benefits of the solution: Improve the performance of lseek(SEEK_HOLE) Work around: If the lseek(SEEK_HOLE) is being invoked from a grep CLI, the '-a' option can bypass the lseek(SEEK_HOLE) call. Problem trigger: High concurrent lseek(SEEK_HOLE) calls on the same file Symptom: Performance Impact/Degradation Platforms affected: ALL Linux OS environments Functional Area affected: All Scale Users Customer Impact: Suggested
Temporary fix
Comments
APAR Information
APAR number
IJ39013
Reported component name
SPEC SCALE STD
Reported component ID
5737F33AP
Reported release
512
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2022-03-25
Closed date
2022-06-01
Last modified date
2022-06-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
SPEC SCALE STD
Fixed component ID
5737F33AP
Applicable component levels
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"STXKQY"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"512","Line of Business":{"code":"LOB26","label":"Storage"}}]
Document Information
Modified date:
02 June 2022