RDAC capable of hot removing unmapped LUNs?

[Eugene Vilensky]

On Tue, Mar 23, 2010 at 12:36 PM, GT4NE1 <GT4NE1 at gmail.com> wrote:
> Hi all,
>
> I'm running RHEL 5.2 64bit with RDAC 09.02.C2.16 attached to Sun
> StorageTek 6540 LUNs. According to the RDAC docs, the "hot_add -d"
> command should remove any unmapped LUNs without having to reboot, but
> Sun support says rebooting is the only way. I've tried "hot_add -d"
> and it doesn't work. Can someone confirm or deny. If rebooting is the
> only way, that is a huge flaw in the RDAC drivers considering that is
> the only officially supported RedHat multi-path driver for the 6540
> according the compatibility matrix.

Is it unsupported to use good ole sysfs?

http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/html/Online_Storage_Reconfiguration_Guide/removing_devices.html

"echo 1 > /sys/block/device-name/device/delete where device-name may
be sde, for example.
Another variation of this operation is echo 1 >
/sys/class/scsi_device/h:c:t:l/device/delete, where h is the HBA
number, c is the channel on the HBA, t is the SCSI target ID, and l is
the LUN."