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Bug 1900522 - mpathpersist does not not change the reservation keys in prkeys file when they key is changed
Summary: mpathpersist does not not change the reservation keys in prkeys file when the...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: device-mapper-multipath
Version: 8.2
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: 8.0
Assignee: Ben Marzinski
QA Contact: Lin Li
URL:
Whiteboard:
Depends On:
Blocks: 1892576 1898049
TreeView+ depends on / blocked
 
Reported: 2020-11-23 09:35 UTC by Roman Hodain
Modified: 2021-09-06 15:20 UTC (History)
10 users (show)

Fixed In Version: device-mapper-multipath-0.8.4-6.el8
Doc Type: Bug Fix
Doc Text:
Cause: When mpathpersist is configured to use the prkeys file and it changes the reservation key, it did not update the prkeys file. Consequence: When future paths come online, multipathd would attempt to register them with the old reservation key, and fail because it was using the wrong key Fix: mpathpersist now updates the prkeys file when it changes the reservation key Result: multipathd will successfully register the correct key on devices that have had their reservation key changed by mpathpersist.
Clone Of:
Environment:
Last Closed: 2021-05-18 15:06:46 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Roman Hodain 2020-11-23 09:35:03 UTC 
Description of problem:
    mpathpersist does not not change the reservation keys in prkeys file when the  key is changed

Version-Release number of selected component (if applicable):
    device-mapper-multipath-0.8.4-5.el8

How reproducible:
100%

Steps to Reproduce:
    1. Register a key 
        # mpathpersist --out --register --param-sark 0xa -d /dev/mapper/3600c0ff00050b9fda179aa5e01000000
        # mpathpersist -i -k  /dev/mapper/3600c0ff00050b9fda179aa5e01000000
          PR generation=0xcfa, 	4 registered reservation keys follow:
            0xa
            0xa
            0xa
            0xa
        # grep 3600c0ff00050b9fda179aa5e01000000 /etc/multipath/prkeys
          0x000000000000000a 3600c0ff00050b9fda179aa5e01000000


    2. Rename the key
        # mpathpersist --out --register --param-rk 0xa --param-sark 0xb -d /dev/mapper/3600c0ff00050b9fda179aa5e01000000
        # mpathpersist -i -k  /dev/mapper/3600c0ff00050b9fda179aa5e01000000
          PR generation=0xcfe, 	4 registered reservation keys follow:
            0xb
            0xb
            0xb
            0xb
        # grep 3600c0ff00050b9fda179aa5e01000000 /etc/multipath/prkeys
          0x000000000000000a 3600c0ff00050b9fda179aa5e01000000


    3 Initiate the reservation
        # mpathpersist --out --reserve --param-rk 0xb --prout-type 5 -d /dev/mapper/3600c0ff00050b9fda179aa5e01000000
          Nov 23 09:30:26 | 3600c0ff00050b9fda179aa5e01000000: configured reservation key doesn't match: 0xa
          PR out: command failed

Actual results:
    The file is not modified and cosequent commands with the new key fails with error:

        Nov 23 09:30:26 | 3600c0ff00050b9fda179aa5e01000000: configured reservation key doesn't match: 0xa
        PR out: command failed


Expected results:
    The file is properly modified 

Additional info:
    This issue affect stacked products like RHV as they provide scsi reservation for the VMs. The Microsoft Windows clusters fail due to this issue.
Comment 2 Ben Marzinski 2020-11-24 02:57:55 UTC 
I should have a fix for this shortly.
Comment 6 Ben Marzinski 2020-12-08 04:02:19 UTC 
Fixed
Comment 9 Lin Li 2021-01-07 07:54:33 UTC 
Verified on device-mapper-multipath-0.8.4-7.el8
1,[root@storageqe-05 SOURCES]# rpm -qa | grep multipath
device-mapper-multipath-libs-0.8.4-7.el8.x86_64
device-mapper-multipath-0.8.4-7.el8.x86_64

2,[root@storageqe-05 SOURCES]# mpathpersist --out --register --param-sark 0xa -d /dev/mapper/360a98000324669436c2b45666c567865
3,[root@storageqe-05 SOURCES]# mpathpersist -i -k  /dev/mapper/360a98000324669436c2b45666c567865  PR generation=0x2c, 	4 registered reservation keys follow:
    0xa
    0xa
    0xa
    0xa

4,[root@storageqe-05 SOURCES]# grep 360a98000324669436c2b45666c567865 /etc/multipath/prkeys
0x000000000000000a 360a98000324669436c2b45666c567865

5,[root@storageqe-05 SOURCES]# mpathpersist --out --register --param-rk 0xa --param-sark 0xb -d /dev/mapper/360a98000324669436c2b45666c567865
6.[root@storageqe-05 SOURCES]# mpathpersist -i -k  /dev/mapper/360a98000324669436c2b45666c567865
  PR generation=0x30, 	4 registered reservation keys follow:
    0xb
    0xb
    0xb
    0xb
7,[root@storageqe-05 SOURCES]# grep 360a98000324669436c2b45666c567865 /etc/multipath/prkeys
0x000000000000000b 360a98000324669436c2b45666c567865  <--------------the reservation keys in prkeys file is changed 

8.[root@storageqe-05 SOURCES]# mpathpersist --out --reserve --param-rk 0xb --prout-type 5 -d /dev/mapper/360a98000324669436c2b45666c567865
<----------------------the command success
9,[root@storageqe-05 SOURCES]# echo $?
0
Comment 14 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
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