Bug 1380602

Summary:	RHEL 7.3: have rbd multipathd checker set lock_on_read rbd map setting
Product:	Red Hat Enterprise Linux 7	Reporter:	Mike Christie <mchristi>
Component:	device-mapper-multipath	Assignee:	Ben Marzinski <bmarzins>
Status:	CLOSED ERRATA	QA Contact:	Lin Li <lilin>
Severity:	unspecified	Docs Contact:	Steven J. Levine <slevine>
Priority:	high
Version:	7.3	CC:	agk, bmarzins, ceph-qe-bugs, heinzm, icolle, jbrassow, lilin, mchristi, mkolaja, msnitzer, mthacker, pasik, pbyregow, prajnoha, snagar, yizhan
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	device-mapper-multipath-0.4.9-100.el7	Doc Type:	Bug Fix
Doc Text:	Read requests sent after failed writes will always return the same data on multipath devices Previously, if a write request wass hung in the `rbd` module, and the iSCSI initiator and multipath layer decided to fail the request to the application, read requests sent after the failure may not have reflected the state of the write. This was because When a Ceph `rbd` image is exported through multiple iSCSI targets, the `rbd` kernel module will grab the exclusive lock when it receives a write request. With this fix, The `rbd` module will grab the exclusive lock for both reads and writes. This will cause hung writes to be flushed and or failed before executing reads. As a result, read requests sent after failed writes will always return the same data.	Story Points:	---
Clone Of:
Clones:	1395298 (view as bug list)		Environment:
Last Closed:	2017-08-01 16:34:26 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:	1378186, 1379890, 1395298

Description Mike Christie 2016-09-30 05:22:57 UTC

Description of problem:

Issue #2 in this bz:

https://bugzilla.redhat.com/show_bug.cgi?id=1378186

required a new rbd mapping option. This bz is to have multipathd's rbd checker pass the lock_on_read to rbd map.


Version-Release number of selected component (if applicable):


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Comment 8 Ben Marzinski 2016-11-09 19:27:23 UTC

applied "rbd: use lock_on_read if set" patch

http://git.opensvc.com/gitweb.cgi?p=multipath-tools/.git;a=commit;h=eeedea6b066ba99308aca3f286aef13b9c93c85e

Comment 14 Steven J. Levine 2017-05-05 21:42:55 UTC

Rearranging doc text for release note format.

Ben: I'm not finding Mike Christie in Red Hat email, so could you check what the doc text now says, to be sure that the sentence rearrangement doesn't change the meaning?  The only thing I actually changed was to  add the word "multipath" to the summary title, to clarify that this is a multipath bz (in the context of the release notes), but if that is not correct please let me know.

Comment 15 Ben Marzinski 2017-05-08 16:44:46 UTC

This looks good to me.

Comment 16 Mike Christie 2017-05-08 17:29:01 UTC

I'm here still :) Not sure what happened to my email.

This looks ok to me. Thanks Ben and Steven.

Comment 23 errata-xmlrpc 2017-08-01 16:34:26 UTC

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/RHBA-2017:1961