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Can you show us the partition table of the disk?
# prtvtoc /dev/rdsk/......
Do you have try to use Solaris Volume Manager ?
I think we can increase volume of the filesystem.
just create more LUN on storage side, and assign it to the server.
but need to know, add exisiting disk into solaris volume manager will lost the data or not ? still question on me.
just try to create new LUN and try to use it on server and add some data, after that you add it into solaris volume manager, just check, it will lost the data or not.
I hope this can help you.
In case you cafully read Docs, you can found that Lun expansion not supported for Solaris....
What realy happens:
/u11 ; /u12 Use same disk but different partitions.
After you increase LUN, disk c3t1d0 will have additional free cylinders at the end of the disk.
After format, select the disk, and set the type to 'auto' - You lost partition table.
You should restore partitoon that use first cylinders same as original and can increase space for last partitions.
It's look like s0 - use first cyinders and s1 - next. So you can make growfs only for /u12.
In case You restore size c3t1d0s0 and configure start cylinder of c3t1d0s1 as original, you can try restore data.
For found what size in cylinders was c3t1d0s0 - use fstyp -v /dev/rdsk/c3t1d0s0 and found ncyl.