root disk mirror in linux

[John Guster]

want write up a script to check if the root disk is mirrored or not, stuck with which command(s) to use? Any suggestions are appreciated.

[Ivan Ferreira]

You must identify if the root file syste is an md (software raid) device from the mount command or fstab file. To check the status consult the /proc/mdstat file.

[John Guster]

the root file system is under LVM. In such case how to find out if it is mirrored?

[Ivan Ferreira]

In that case, there are two options.

If you are using software raid, consult which physical volumes are in your root volume group:

vgdisplay -v vg00 | grep "PV Name"

You should see something like /dev/md* in the physical device if it's a software RAID.

If you are using a hardware raid, then the procedure is different depending of your hardware provider.

[John Guster]

It is Dell PowerEdge 3xxx hardware. vgdisplay shows Cur PV=Act PV=1. it is not mirrored at software level. any steps available in checking hardware mirroring from you? Thanks

[Ivan Ferreira]

This page may help you:

http://tools.rapidsoft.de/perc/