Linux – Check health of RAID array

linuxmdadmraid

I have a server with RAID 1.

Currently when I type in the following command:

cat /proc/mdstat

I get:

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty] 
unused devices: <none>

What does this mean? The server works fine but why doesn't the RAID array show up here?

Best Answer

This simply means you don't have any configured software raid device in your Linux box. I think you have a hardware raid controller which can not been seen this way.

Related Solutions

Software MDADM RAID 5 – Inactive MD0 showing

Looks like your drives are all being reported as [S]pares. You should check your logs (dmesg, /var/log/messages) to see if there's any indication why this happened.

Try running the following

sudo mdadm --examine --scan --config=/etc/mdadm/mdadm.conf

And see the output. If it outputs something like this:

ARRAY /dev/md0 level=raid5 metadata=1 num-devices=3 UUID=22f22c3599:613d5231:d407a655:bdeb84 name=backup:1

Then you can append it to the bottom of the mdadm.conf:

sudo mdadm --examine --scan --config=/etc/mdadm/mdadm.conf >> /etc/mdadm/mdadm.conf

Then try starting the array:

sudo mdadm -A /dev/md0

Good luck.

Linux: very slow mdadm resync on raid 1

Probably a silly question, but have you verified that the speed_limit_max is also sufficiently high? 4000MB/s would be blindingly fast, that must be the cached speed not the actual disk speed.

Best Answer

Related Solutions

Software MDADM RAID 5 – Inactive MD0 showing

Linux: very slow mdadm resync on raid 1

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