Bug 1973592

Summary:	RFE: Request for warning if multipathd is not running/active
Product:	Red Hat Enterprise Linux 8	Reporter:	Lin Li <lilin>
Component:	device-mapper-multipath	Assignee:	Ben Marzinski <bmarzins>
Status:	CLOSED ERRATA	QA Contact:	Lin Li <lilin>
Severity:	high	Docs Contact:
Priority:	medium
Version:	8.5	CC:	agk, bmarzins, heinzm, msnitzer, prajnoha, zkabelac
Target Milestone:	beta	Keywords:	FutureFeature, Triaged
Target Release:	8.5	Flags:	pm-rhel: mirror+
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	device-mapper-multipath-0.8.4-17.el8	Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 19:32:00 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:

Description Lin Li 2021-06-18 09:18:46 UTC

Description of problem:
RFE: Request for warning if multipathd is not running/active

Version-Release number of selected component (if applicable):
device-mapper-multipath-0.8.4-13.el8

How reproducible:
always

Steps to Reproduce:
1.# rpm -qa | grep multipath
device-mapper-multipath-libs-0.8.4-13.el8.ppc64le
device-mapper-multipath-0.8.4-13.el8.ppc64le
2.# mpathconf --enable
3.# service multipathd restart
Redirecting to /bin/systemctl restart multipathd.service
4.# multipath -ll
mpatha (3600601605e203f00d6ed8ff61e07eb11) dm-0 DGC,VRAID
size=8.0G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=10 status=enabled
| |- 1:0:0:0 sda 8:0  active ready running
| `- 2:0:0:0 sdc 8:32 active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  |- 1:0:1:0 sdb 8:16 active ready running
  `- 2:0:1:0 sdd 8:48 active ready running

5.# service multipathd stop
Redirecting to /bin/systemctl stop multipathd.service
Warning: Stopping multipathd.service, but it can still be activated by:
  multipathd.socket

6.# multipath -ll
mpatha (3600601605e203f00d6ed8ff61e07eb11) dm-0 DGC,VRAID
size=8.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=10 status=enabled
| |- 1:0:0:0 sda 8:0  active ready running
| `- 2:0:0:0 sdc 8:32 active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  |- 1:0:1:0 sdb 8:16 active ready running
  `- 2:0:1:0 sdd 8:48 active ready running



Actual results:
List multipath devices while multipathd is stopped, but multipath doesn't  print a warning message.

Expected results:
List multipath devices while multipathd is stopped, multipath  prints a warning message. Similar as: multipath device maps are present, but 'multipathd' service is not running; IO failover/failback will not work without 'multipathd' service running

Additional info:
I reproduced it on IBM power server. But I guess I can reproduce it on all arch.

Comment 3 Ben Marzinski 2021-07-26 18:33:09 UTC

Multipath now warns if multipathd is not running.

Comment 7 Lin Li 2021-07-29 02:04:20 UTC

Verified on device-mapper-multipath-0.8.4-17.el8
1,[root@ibm-p9z-20-lp13 ~]# rpm -qa | grep multipath
device-mapper-multipath-libs-0.8.4-17.el8.ppc64le
device-mapper-multipath-0.8.4-17.el8.ppc64le

2,# mpathconf --enable

3.# service multipathd restart
Redirecting to /bin/systemctl restart multipathd.service

4.# multipath -ll
mpatha (3600601605e203f00d6ed8ff61e07eb11) dm-0 DGC,VRAID
size=8.0G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=10 status=enabled
| |- 1:0:0:0 sda 8:0  active ready running
| `- 2:0:0:0 sdc 8:32 active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  |- 1:0:1:0 sdb 8:16 active ready running
  `- 2:0:1:0 sdd 8:48 active ready running

5,[root@ibm-p9z-20-lp13 ~]# service multipathd stop
Redirecting to /bin/systemctl stop multipathd.service

6,[root@ibm-p9z-20-lp13 ~]# service multipathd status
Redirecting to /bin/systemctl status multipathd.service
● multipathd.service - Device-Mapper Multipath Device Controller
   Loaded: loaded (/usr/lib/systemd/system/multipathd.service; enabled; vendor >
   Active: inactive (dead) since Wed 2021-07-28 21:58:26 EDT; 57s ago
Condition: start condition failed at Wed 2021-07-28 21:58:35 EDT; 48s ago
           └─ ConditionPathExists=/etc/multipath.conf was not met
  Process: 27000 ExecStart=/sbin/multipathd -d -s (code=exited, status=0/SUCCES>
  Process: 26998 ExecStartPre=/sbin/multipath -A (code=exited, status=0/SUCCESS)
  Process: 26996 ExecStartPre=/sbin/modprobe -a scsi_dh_alua scsi_dh_emc scsi_d>
 Main PID: 27000 (code=exited, status=0/SUCCESS)
   Status: "shutdown"

Jul 28 03:26:11 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com multipathd[27000]: 8:>
Jul 28 03:26:11 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com multipathd[27000]: mp>
Jul 28 03:26:11 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com multipathd[27000]: mp>
Jul 28 03:26:11 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com multipathd[27000]: 8:>
Jul 28 03:26:11 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com multipathd[27000]: mp>
Jul 28 21:58:26 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com systemd[1]: Stopping >
Jul 28 21:58:26 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com multipathd[27000]: ex>
Jul 28 21:58:26 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com multipathd[27000]: -->
Jul 28 21:58:26 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com systemd[1]: multipath>
Jul 28 21:58:26 ibm-p9z-20-lp13.fs.lab.eng.bos.redhat.com systemd[1]: Stopped D>

7,[root@ibm-p9z-20-lp13 ~]# multipath -ll
mpatha (3600601605e203f00d6ed8ff61e07eb11) dm-0 DGC,VRAID
size=8.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=10 status=enabled
| |- 1:0:0:0 sda 8:0  active ready running
| `- 2:0:0:0 sdc 8:32 active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  |- 1:0:1:0 sdb 8:16 active ready running
  `- 2:0:1:0 sdd 8:48 active ready running
Jul 28 21:59:32 | multipath devices exist, but multipathd service is not running


Test result: Multipath now warns "multipath devices exist, but multipathd service is not running" if multipathd is not running.

Comment 10 errata-xmlrpc 2021-11-09 19:32:00 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/RHBA-2021:4367