| Summary: | [RFE] LVM RAID: Add RAID 4/5/6 journaling support (raid5-cache) | |||
|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Jonathan Earl Brassow <jbrassow> | |
| Component: | lvm2 | Assignee: | Heinz Mauelshagen <heinzm> | |
| lvm2 sub component: | Mirroring and RAID | QA Contact: | cluster-qe <cluster-qe> | |
| Status: | CLOSED WONTFIX | Docs Contact: | ||
| Severity: | unspecified | |||
| Priority: | low | CC: | agk, cmarthal, heinzm, jbrassow, mcsontos, msnitzer, pasik, prajnoha, roland.friedwagner, zkabelac | |
| Version: | 8.2 | Keywords: | FutureFeature | |
| Target Milestone: | rc | |||
| Target Release: | 8.4 | |||
| Hardware: | Unspecified | |||
| OS: | Unspecified | |||
| Whiteboard: | ||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | ||
| Doc Text: | Story Points: | --- | ||
| Clone Of: | ||||
| : | 1400194 1482610 (view as bug list) | Environment: | ||
| Last Closed: | 2020-12-01 07:27:37 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: | ||
| Bug Depends On: | 1400194, 1430028 | |||
| Bug Blocks: | ||||
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Description
Jonathan Earl Brassow
2016-11-10 22:05:41 UTC
*** Bug 1394052 has been marked as a duplicate of this bug. *** raid5-cache.c provides 2 major features: - journal stripes on a dedicated device to address the write hole caused by non-atomic updates of N raid disks; this obviously introduces latencies, thus slows down raid4/5/6 io - allow for writeback caching of dirty journal entries in order to compensate journalling penalties (upstream 11/10/2016); this obviously introduces resilience issues WRT the journal device thus requiring resilient types to be used Kepping this bz for the future uspace part of the implementation and cloned https://bugzilla.redhat.com/show_bug.cgi?id=1400194 for the kernel part. "[RHEL7.5 PATCH v2 00/17] dm raid: update to upstream fixing deadlocks/races" to rhkernel-list on Dec 13 This bug is for LVM integration, not kernel feature inclusion or updates. Moving back to ASSIGNED as there will be required LVM changes to make use of the kernel features. Not planning to add to RHEL7. Moving to RHEL8 which has support for journal device and modes (writeback and writethrough). After evaluating this issue, there are no plans to address it further or fix it in an upcoming release. Therefore, it is being closed. If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened. |