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Old 03-05-2012, 12:12 AM   #1
Registered: Dec 2006
Location: Russia,52
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Question can't create md devices

I just installed RHES 6.2, so I need to create a md device. I type "cat /etc/mdstat"
Personalities :
unused devices: <none>

So, my personalities is empty, is it means that I can't create any md device, why?
Old 03-05-2012, 01:56 AM   #2
Registered: Mar 2011
Location: Rome - Italy
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Obviously I think you want to create a software RAID, not a hardware one (even if nowaday even hardware RAIDs are almost software).
In Red-Hat you can create a RAID during installation or by mdadm command.
The fact that mdstat personalities are empty means only that there's no md device.
Old 03-05-2012, 03:27 AM   #3
Satyaveer Arya
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/etc/mdstat tells you about your current configuration. It doesn't mean that you cannot create raid devices.
On redhat you can create RAID devices by using mdadm --create and then later you can add them in the /etc/mdadm.conf file. Refer to this page for more information on raid arrays:


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