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Need to remove unused luns

in Oracle VM (OVM) (MOSC) Question
Hi,

I have Oracle VM manager server in production running with 7 VMs attached with ZFS storage 7120. While installation we created several luns and the storage is almost full now. I need to identify which all the luns are not used in VMs and what is the best practice to remove those luns.

Just identified one lun, but while taking that lun offline on storage, my VM Manager server got hung and end up with reboot of all VMs and VM manager server. After reboot I checked log messages and found lot of IO error. Can some one please let me know what is the procedure we need to follow for remove the unused luns?

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