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Bug 1819897

Summary:	[RFE] Add an option in multipath.conf file to set the "eh_deadline" SCSI error handling option
Product:	Red Hat Enterprise Linux 8	Reporter:	Ben Marzinski <bmarzins>
Component:	device-mapper-multipath	Assignee:	Ben Marzinski <bmarzins>
Status:	CLOSED ERRATA	QA Contact:	Lin Li <lilin>
Severity:	medium	Docs Contact:
Priority:	high
Version:	8.2	CC:	agk, apanagio, aperotti, bmarzins, heinzm, jbrassow, lilin, lvm-team, mgandhi, msnitzer, prajnoha, zkabelac
Target Milestone:	rc	Keywords:	FutureFeature, Triaged
Target Release:	8.3	Flags:	pm-rhel: mirror+
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	device-mapper-multipath-0.8.4-6.el8	Doc Type:	Enhancement
Doc Text:	Feature: Added "eh_deadline" option for /etc/multipath.conf Reason: Sometimes a fc rport is never lost, meaning that fast_io_fail_tmo and dev_loss_tmo never trigger, but scsi commands still hang. Result: After the eh_deadline timeout the scsi layer will perform a full HBA reset, flushing all hung commands	Story Points:	---
Clone Of:	1813259	Environment:
Last Closed:	2021-05-18 15:06:46 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:	1813259
Bug Blocks:

Comment 3 Andrea Perotti 2020-09-24 20:47:17 UTC

1. Proposed title of this feature request

Add an option in multipath.conf file to set the "eh_deadline" SCSI error handling option

3. What is the nature and description of the request?
4. Why does the customer need this? (List the business requirements here)

Customers often need to enable the SCSI error handling tuning options e.g. eh_deadline to reduce the time in SCSI error handling process. When this option is set on specific FC HBA, the error handling process will wait for a timeout set in eh_deadline before proceeding with HBA reset.

This option is found to be useful in many Oracle RAC, RHEV and RHEL HA cluster setups to reduce the time in SCSI error handling process and quickly failover the IO requests from failed paths to remaining active paths.

It is also documented briefly in following article:

"Limiting path failover time for SCSI devices"
https://access.redhat.com/solutions/627903

Setting multiple different options in multipath.conf file (e.g. fast_io_fail_tmo, dev_loss_tmo, checker_timeout, etc) and then separately tuning the SCSI error handling tuning option e.g. eh_deadline through a udev rule creates additional administrative overhead.

To ease the tuning of these options, customer has suggested to enable an option in multipath.conf file, which will tune the "eh_deadline" option for FC HBAs that connects the multipath device maps.

The main aim of raising this RFE is to have a single file where customer could apply these tuning options instead of maintaining different tuning options in different files e.g. multipath.conf, udev rules etc.

5. How would the customer like to achieve this? (List the functional requirements here)
6. For each functional requirement listed, specify how Red Hat and the customer can test to confirm the requirement is successfully implemented.

Above point 3 describes the same

7. Is there already an existing RFE upstream or in Red Hat Bugzilla?

No.

8. Does the customer have any specific timeline dependencies and which release would they like to target (i.e. RHEL7/8)?

No.

9. Is the sales team involved in this request and do they have any additional input?

No.

10. List any affected packages or components.

device-mapper-multipath

Comment 10 Ben Marzinski 2020-12-08 01:40:22 UTC

Added the eh_deadline option.

Comment 15 errata-xmlrpc 2021-05-18 15:06:46 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 (device-mapper-multipath bug fix and enhancement update), 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/RHEA-2021:1685