Hello all/Neil,
I am trying to change the chunk size on a RAID 0 (two SSD) from 512K to 64K.
I am running Debian Stretch with a 4.10 kernel.
MDADM version is 4.0 (GIT).
This is the command string being issued -
mdadm --grow -c 64 --backup-file=/zz/backup.file /dev/md0
or
mdadm --grow -c 64 /dev/md0
both of the abovementioned commands produce this message -
"mdadm: /dev/md0: could not set level to raid4"
A snippet from dmesg -
.
.
md/raid:md0: cannot takeover raid0 with more than one zone.
md: md0: raid4 would not accept array
.
.
My MDADM setup -
mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sat Jan 14 16:51:54 2017
Raid Level : raid0
Array Size : 497783808 (474.72 GiB 509.73 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sat Jan 14 16:51:54 2017
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Chunk Size : 512K
Name : Pezenas:0 (local to host Pezenas)
UUID : 77cd6f4e:f98bf2b0:862948df:12da38fa
Events : 0
Number Major Minor RaidDevice State
0 259 4 0 active sync /dev/nvme0n1p2
1 259 2 1 active sync /dev/nvme1n1p1
I recall doing something similiar a few years ago and it worked, though not using
NVME drives.
Any help/pointers much appreciated.
Regards,
John
John Cassidy
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