raid-5 initiated as raid-4?

[Roy Sigurd Karlsbakk <roy@karlsbakk.net>]

Hi all

I have a test vm on which I do some testing of md raid. Just tried

root@raidtest:~# mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/vd{b..d}
(wait a bit)
root@raidtest:~# cat /proc/mdstat 
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid5 vdf[5](S) vde[4](S) vdd[3] vdc[1] vdb[0]
      4191232 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]

ok, raid's up, but checking the data actually stored on disk on the host system shows:

root@smilla:/raid/libvirt/images# ls -l raidtest-{1..3}.qcow2
-rw-r--r-- 1 libvirt-qemu kvm     393216 Feb  7 18:06 raidtest-1.qcow2
-rw-r--r-- 1 libvirt-qemu kvm     393216 Feb  7 18:06 raidtest-2.qcow2
-rw-r--r-- 1 libvirt-qemu kvm 2146500608 Feb  7 18:06 raidtest-3.qcow2

Does this mean the raid-5 is actually initiated as a raid-4?

Vennlige hilsener / Best regards

roy
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Roy Sigurd Karlsbakk
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