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Nux
Asked: 2013-04-10 03:53:24 +0800 CST

How to check RAID level on linux (dmraid)

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I already know the RAID is a software RAID made with dmraid (or I assume so based on the fact that df-h shows /dev/mapper/VolGroup..., also /dev/md0 is inactive).

I've run dmraid -r and get:

/dev/sda: ddf1, ".ddf1_disks", GROUP, ok, 1953253376 sectors, data@ 0
/dev/sdb: ddf1, ".ddf1_disks", GROUP, ok, 1953253376 sectors, data@ 0

But I was unable to find information of the format of results. How do I find out details of the RAID setup. Specifically level of RAID (RAID 0 or RAID 1?). Does 0 at the stand for RAID 0?

centos

2 Answers

  1. Best Answer

    dmraid with the -s switch should get you the level.

    dmraid -s

    Shown under 'type'.

    Oh, FYI: the md0, md1, etc. is not the RAID level, but rather the individual partition on the RAID, just like you have /dev/sd0, /dev/sd1, /dev/hd1, etc.

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  2. cat /proc/mdstat

    Look for the "personalities" bit.

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