Bug 1735666
| Summary: | [Disperse volume]: Regression in IO performance seen in sequential read for large file | |||
|---|---|---|---|---|
| Product: | [Red Hat Storage] Red Hat Gluster Storage | Reporter: | Rinku <rkothiya> | |
| Component: | read-ahead | Assignee: | Xavi Hernandez <jahernan> | |
| Status: | CLOSED WONTFIX | QA Contact: | Rahul Hinduja <rhinduja> | |
| Severity: | high | Docs Contact: | ||
| Priority: | high | |||
| Version: | rhgs-3.5 | CC: | amukherj, aspandey, jahernan, nchilaka, puebele, rgowdapp, rhinduja, rhs-bugs, storage-qa-internal, vdas | |
| Target Milestone: | --- | Flags: | puebele:
needinfo+
aspandey: needinfo- |
|
| Target Release: | --- | |||
| Hardware: | x86_64 | |||
| OS: | Linux | |||
| Whiteboard: | ||||
| Fixed In Version: | Doc Type: | Known Issue | ||
| Doc Text: |
In some cases, both kernel read-ahead and gluster read-ahead mechanisms cause a large increase in the amount of data read during sequential read operations. In these cases, performance for sequential reads, especially on dispersed volumes, is significantly worse.
If you are affected by this issue, you can work around the problem by manually disabling gluster read-ahead and io-cache behavior using the following commands.
# gluster volume set <volname> read-ahead off
# gluster volume set <volname> io-cache off
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Story Points: | --- | |
| Clone Of: | ||||
| : | 1788656 (view as bug list) | Environment: | ||
| Last Closed: | 2019-11-18 16:21:58 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: | ||||
| Bug Blocks: | 1696815, 1788656 | |||