how to mount a shared lun between two hosts

[aliyesami]

i had bunch of luns from storede 3310 mounted on a T2000 and being used. Then i added a second T2000 to the storage array but
now i cant mount them on either nodes , i do see them in format though.

these luns have data on them and they were mounted on one so how do i mount them read/write on both nodes without loosing data ?

thanks

 

[aliyesami]

working now .. it had changed the controller id for the luns , after correcting the controller id i ccan mount thee luns on both nodes