How can another target driver co-exist with sd driver?

Hi,
Is it possible if I have my own disk driver mysd co-exist with standard 'sd' driver.
My driver mysd has to detect LUNs exported by myStorBox (our storage box)
and manage them while sd driver handle all LUNs connected to the system except myStorBox?
Both will be scsi class target drivers. How to configure mysd.conf or sd.conf or both
to achive the selective handling of devices?
My guess is that 'sd' driver will detect all scsi LUNs (based on the info
given in sd.conf) including any LUNs exported by myStorBox. If mysd driver
loads after sd driver (how to ensure this), it will be given a chance to probe all LUNs. mysd driver
would look at the serial numbers and find out if they are from myStorBox.
If they are from myStorBox, then it will claim these LUNs. At this point what
happens to the device instances claimed by sd driver already for the LUNs
from myStorBox?
You help is really appreciated!
SR

The answer is "yes, but..."
To make the long story short, don't compete with sd,
use it.
Stack over it and let it handle the regular disk
stuff, do extra stuff in your driver.I tried to create a filter driver sitting on top of sd driver but was unable to
get scsi sense data when an IO fails. Our storage box reports its
internal path failover through SCSI Unit Attention which is consumed
by sd driver. Hence thinking of the painful task of competing with
sd driver. I would really appreciate how to co-exist with sd driver
but for only the disks exported by our storage box ?
Thanks in advance!

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How can another target driver co-exist with sd driver?

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