Bug 1630688
| Summary: | Low Random write IOPS in VM in RHHI 2.0 | ||
|---|---|---|---|
| Product: | [Red Hat Storage] Red Hat Gluster Storage | Reporter: | Pranith Kumar K <pkarampu> |
| Component: | replicate | Assignee: | Ravishankar N <ravishankar> |
| Status: | CLOSED ERRATA | QA Contact: | Vijay Avuthu <vavuthu> |
| Severity: | urgent | Docs Contact: | |
| Priority: | high | ||
| Version: | rhgs-3.4 | CC: | ahadas, amukherj, anepatel, apaladug, chpai, famz, godas, guillaume.pavese, kdhananj, kwolf, michal.skrivanek, mpillai, pkarampu, psuriset, ravishankar, rhs-bugs, sabose, sanandpa, sankarshan, sasundar, shberry, sheggodu, storage-qa-internal, vbellur, ykaul |
| Target Milestone: | --- | Keywords: | ZStream |
| Target Release: | RHGS 3.4.z Batch Update 1 | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | glusterfs-3.12.2-20 | Doc Type: | Bug Fix |
| Doc Text: |
Previously, the eager-lock mechanism blocked simultaneous file access even in cases where many reads and only one write was being attempted. This increased wait times for read operations when a write was occurring. The eager-lock mechanism now only blocks simultaneous write operations, instead of affecting write and read operations.
With this fix, the algorithm to disable the eager-lock is modified and it disables only when multiple write operations are trying to modify a file at the same time. This led to performance improvement while a write operation is performed on a file irrespective of the number of times it is opened at the same time for read operation.
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Story Points: | --- |
| Clone Of: | 1616270 | Environment: | |
| Last Closed: | 2018-10-31 08:46:17 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1630368, 1635972, 1635976, 1635980 | ||
| Bug Blocks: | 1577822, 1596040, 1616270 | ||
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Comment 2
Pranith Kumar K
2018-09-19 06:31:47 UTC
Adding the RHHI QE validation results. As part of RHHI functional testing, the changes are good and verified. Also measured the high-level performance ( without accurate numbers ), the performance has improved a lot now. As per comment #9 and comment #15, setting this bug to verified state Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2018:3432 |