I have met some errors when running sginfo command to the DM device. Here is the error message:
# sginfo* /dev/mapper/mpath0
A device name that understands SCSI commands is required
Couldn't find sg device corresponding to /dev/mapper/mpath0
However, I ever noticed that the latest RHEL would support*persistent reservation*for DM-MPIO. I don't have a chance to try it yet. Anyone can shed some light on how the PR is implemented? Currently the device mapper pseudo device does not even respond to SCSI 3 inquiry command...
thx a lot!
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