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My server Dell R210 runs a Debian squeeze with hardware RAID1 (H200) preconfigured. But I notice that there is mdadm running. Sometimes in backup, or in OS upgrade (to Debian 6.0.4), I have messages like this:

W: mdadm: /etc/mdadm/mdadm.conf defines no arrays.
W: mdadm: no arrays defined in configuration file.

Are they safe to ignore? How do I disable mdadm? Just a /etc/init.d/mdadm stop, a bit of observation then apt-get remove mdadm?

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The message you have about mdadm.conf don't garanties you don't have arrays. The configuration file rarely contains any array.

cat /proc/mdstat

If you see no array, you can remove the mdadm package. Or leave it, no problem. 

apt-get purge mdadm
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cat /proc/mdstat says: Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] unused devices: <none>. I would like to remove it because I think the monitoring slows down the machine. – jcisio Jan 28 at 20:34
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There is no slowdown unless you can prove it. – jørgensen Jan 28 at 21:10
@jørgensen There is an unused process running in background. It should cost something. – jcisio Jan 29 at 9:54
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