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Bug 2042032

Summary: multipath doesn't support the historical-service-time path selector
Product: Red Hat Enterprise Linux 9 Reporter: Ben Marzinski <bmarzins>
Component: device-mapper-multipathAssignee: Ben Marzinski <bmarzins>
Status: CLOSED ERRATA QA Contact: Lin Li <lilin>
Severity: unspecified Docs Contact:
Priority: high    
Version: 9.0CC: agk, bmarzins, heinzm, lilin, msnitzer, prajnoha, zkabelac
Target Milestone: rcKeywords: Triaged
Target Release: ---Flags: pm-rhel: mirror+
Hardware: All   
OS: Unspecified   
Whiteboard:
Fixed In Version: device-mapper-multipath-0.8.7-4.el9 Doc Type: Bug Fix
Doc Text:
Cause: Multipath wasn't correctly parsing the status output for multipath devices using the historical-service-time path selector Consequence: Multipathd would not be able to track the kernel state of multipath devices that use the historical-service-time path selector, causing it to occasionally mark failed paths as usable. Fix: multipath now correctly parses the status of multipath devices that use the historical-service-time path selector. Result: Multipathd no longer occasionally marks failed paths as usable for devices using the historical-service time path selector.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2022-05-17 15:56:11 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: 2000835    
Bug Blocks:    

Description Ben Marzinski 2022-01-18 17:39:58 UTC 
Description of problem:
Bug #2000835 adds kernel support for the historical-service-time path selector, but the device-mapper-multipath userspace tools don't handle it correctly. When a multipath device is configure to use the historical-service-time selector, multipath commands print warning messages of the form: "error parsing map <WWID>"

How reproducible:
Always

Steps to Reproduce:
1. Get a kernel that includes the dm-historical-service-time module. See https://bugzilla.redhat.com/show_bug.cgi?id=2000835#c3 for links to kernel rpms with this module
2. configure multipath to use the historical-service-time selector. Add the line
        path_selector "historical-service-time 0"
to the defaults section of multipath.conf
3. create some multipath devices
4. Run "multipath -l" to list them

Actual results:
The devices will be using the selector. You will see
policy='historical-service-time 2'
but the command will print a warning message "error parsing map <WWID>"

Expected results:
No warning message
Comment 6 Lin Li 2022-02-09 13:08:12 UTC 
Verified on device-mapper-multipath-0.8.7-4.el9
[root@storageqe-25 ~]# rpm -qa | grep multipath
device-mapper-multipath-libs-0.8.7-4.el9.x86_64
device-mapper-multipath-0.8.7-4.el9.x86_64

[root@storageqe-25 ~]# rpm -qa | grep multipath
device-mapper-multipath-libs-0.8.7-4.el9.x86_64
device-mapper-multipath-0.8.7-4.el9.x86_64

[root@storageqe-25 ~]# uname -r
5.14.0-55.el9.x86_64

Edit /etc/multipath.conf
[root@storageqe-25 ~]# cat /etc/multipath.conf 
defaults {
	user_friendly_names yes
	find_multipaths yes
        path_selector "historical-service-time 0"
}


[root@storageqe-25 ~]# service multipathd reload
Redirecting to /bin/systemctl reload multipathd.service


[root@storageqe-25 ~]# multipath -l
360a98000324669436c2b45666c567858 dm-3 NETAPP,LUN
size=2.0G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
|-+- policy='historical-service-time 2' prio=0 status=active
| |- 7:0:1:0 sdf 8:80  active undef running
| `- 8:0:0:0 sdj 8:144 active undef running
`-+- policy='historical-service-time 2' prio=0 status=enabled
  |- 7:0:0:0 sdb 8:16  active undef running
  `- 8:0:1:0 sdn 8:208 active undef running
360a98000324669436c2b45666c56785a dm-4 NETAPP,LUN
size=2.0G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
|-+- policy='historical-service-time 2' prio=0 status=active
| |- 7:0:1:1 sdg 8:96  active undef running
| `- 8:0:0:1 sdk 8:160 active undef running
`-+- policy='historical-service-time 2' prio=0 status=enabled
  |- 7:0:0:1 sdc 8:32  active undef running
  `- 8:0:1:1 sdo 8:224 active undef running
360a98000324669436c2b45666c567861 dm-5 NETAPP,LUN
size=2.0G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
|-+- policy='historical-service-time 2' prio=0 status=active
| |- 7:0:1:2 sdh 8:112 active undef running
| `- 8:0:0:2 sdl 8:176 active undef running
`-+- policy='historical-service-time 2' prio=0 status=enabled
  |- 7:0:0:2 sdd 8:48  active undef running
  `- 8:0:1:2 sdp 8:240 active undef running
360a98000324669436c2b45666c567863 dm-6 NETAPP,LUN
size=2.0G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
|-+- policy='historical-service-time 2' prio=0 status=active
| |- 7:0:1:3 sdi 8:128 active undef running
| `- 8:0:0:3 sdm 8:192 active undef running
`-+- policy='historical-service-time 2' prio=0 status=enabled
  |- 7:0:0:3 sde 8:64  active undef running
  `- 8:0:1:3 sdq 65:0  active undef running
Comment 8 errata-xmlrpc 2022-05-17 15:56:11 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 (new packages: device-mapper-multipath), 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-2022:3971