Bug 977312 - mdadm Software Raid 1 hangs on FC path loss
mdadm Software Raid 1 hangs on FC path loss
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: mdadm (Show other bugs)
i686 Linux
unspecified Severity high
: rc
: ---
Assigned To: Doug Ledford
Red Hat Kernel QE team
Depends On:
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Reported: 2013-06-24 05:51 EDT by Ralf Wagner
Modified: 2013-06-24 13:16 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2013-06-24 13:16:25 EDT
Type: Bug
Regression: ---
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RHEL 7.3 requirements from Atomic Host:
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Description Ralf Wagner 2013-06-24 05:51:45 EDT
Description of problem:

I wanted to try out mdadm Software Raid 1 and assigned two FC LUNs to a test Server and did a standard Setup. After successfull setup i deassigned one of the two LUNs to simulate a desaster szenario. The software raid became unusable.

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


How reproducible:

Steps to Reproduce:
1. Assign two fc luns fc-lun1 fc-lun2 
2. create software raid 1: mdadm --create  --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/mapper/fc-lun1 /dev/mapper/fc-lun2 
3. mkfs.ext4  /dev/md0 + mount /dev/md0 /mnt/test
4. deassign one of the luns from step1

Actual results:

- mdadm --detail /dev/md0 ---> does not terminate
- cat /proc/mdstat ---> does not terminate
- /mnt/test is not writable

Expected results:

- raid status info with the commands
mdadm --detail /dev/md0 or
cat /proc/mdstat
- writeble /mnt/test filesystem

Additional info:
words cannot describe my disappointment
Comment 1 Ralf Wagner 2013-06-24 05:58:59 EDT
i will recheck my multipath setup, maybe multipath tries to hide the path loss ....
Comment 3 Ralf Wagner 2013-06-24 06:26:11 EDT
OK, sorry guys this was my fault (wrong multipath.conf), very embarrassing. Ticket can be closed.
Comment 4 Doug Ledford 2013-06-24 13:16:25 EDT
OK, closing out.  Glad to hear it works for you ;-)

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