How to backup LUNs

Hi all,

is there some one who could share his own best pratics for backing up storage lun with DomU inside?

While testing the right approach I have realized this situation:

1.       A clustered Volume Group named “XenVG” and many Logical Volumes named “<domUname>LV”;

2.       domU installed directly on the lun (for example: /dev/sdm).

How could I backup them?

My hardware situation is:

1 Dell MD3000i storage

3 Dell 2950 servers

My software situation:

3 CentOS 5.3  clustered

3 XEN 3.3.1

Thanks all,

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