Hello all,
The device name referenced in the mdadm --examine --scan does not exist
when using metadata=1.2 and --name on the creation.
I am using metadata 0.9 as a bases to test against 1.2.
Am I fighting a udev rule? Did the symlink from /dev/md/TEST_MD to
/dev/md0 disappear?
If I start with METADATA=0.9 and specifying a --name
# mdadm --create --verbose /dev/md0 --level=0 --metadata=0.9
--raid-devices=2 --name=TEST_MD /dev/sdd /dev/sde
with METADATA=0.9, there is no NAME field printed on DETAIL
# mdadm -D /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Thu Jul 27 10:36:02 2017
Raid Level : raid0
Array Size : 293045760 (279.47 GiB 300.08 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Jul 27 10:36:02 2017
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Chunk Size : 512K
Consistency Policy : none
UUID : 623d8bac:8819491b:e9034e5d:acd14f01
Events : 0.1
Number Major Minor RaidDevice State
0 8 48 0 active sync /dev/sdd
1 8 64 1 active sync /dev/sde
The --examine --scan shows /dev/md0, and not /dev/md/TEST_MD.
# mdadm --examine --scan
ARRAY /dev/md0 UUID=65cb66eb:d8a0d9ff:85609b40:89383835
Next, change the METADATA=1.2 and specifying a --name
# mdadm --create --verbose /dev/md0 --level=0 --metadata=1.2
--raid-devices=2 --name=TEST_MD /dev/sdd /dev/sde
With METADATA=1.2, there is a NAME field printed:
thinkstation:TEST_MD (local to host thinkstation)
# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Thu Jul 27 11:13:02 2017
Raid Level : raid0
Array Size : 292784128 (279.22 GiB 299.81 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Thu Jul 27 11:13:02 2017
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Chunk Size : 512K
Consistency Policy : none
Name : thinkstation:TEST_MD (local to host thinkstation)
UUID : 591d68eb:5182a6e2:ead93be0:812f7fc6
Events : 0
Number Major Minor RaidDevice State
0 8 48 0 active sync /dev/sdd
1 8 64 1 active sync /dev/sde
The --examine --scan is shows /dev/md/TEST_MD and not /dev/md0.
# mdadm --examine --scan
ARRAY /dev/md/TEST_MD metadata=1.2
UUID=413a8ca9:a1edb21b:9eb8876d:784349ed name=thinkstation:TEST_MD
This problem is, /dev/md/TEST_MD does not exist. /dev/md0 does.
mdadm --version
mdadm - v4.0-158-gcb91230 - 2017-07-10
Am I fighting udev rules?
Regards,
-Nigel
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