Can I reassign mapped but not masked devices?

when i reclaim devices i like to make sure there is no I/O going to them. I would add these devices to a device group and run symstat for a while to make sure you don't see a single I/O.

I agree with dynamox that  you need to make sure there is no I/O transfer on that host, and that device dosent contain any old data.

From ECC also you can do those action.like assign unassigned,map vol, unmap vol;mask and unmasked volume.or device.

to do your requirement just first unmap those device.(right click on those device and click on unmap ) Now you select those device which you need to unmap,and right click on unmap.It may take little bit time.after that u can assign those device to other FA ports.but make sure zoning has done .

Thank you!

To make sure all 0's for I/O column, what is the difference between running symstat on the device group, and on an individual device?

I can think of is to run the following command:

symstat-type REQUEST -sid 123 -i 60 -c 100

Then check out I/O/SEC or KB/SEC, they all should be 0 on the device. Is this a way to make sure there are no I/O's on a device?

Could you please explore it more on your idea of adding devices to a device group, and then run symstat?

Happy New Year!

convenience, instead of running 3 symstat command for 3 individual devices ..just group them and run symstat against device group.