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You are correct in stating that putting disk and tape on the same SAN should not be a problem, provided that you are not using an arbitrated loop (FC-AL) solution for both disk and tape in the SAME loop.
It is usually wise to use a separate HBA for tape backup so that backup operations do not use all your bandwidth during production runs. You can share an adapter for both disk and tape access as long as you're in a switched environment. This allows for a cheaper implementation but backup will impact production if using the same adapter. Tape rewinds at times cause a SCSI reset to be sent on a shared loop and this may cause LIPs during disk access, which is not a good thing.
I usually provide two HBAs for resiliency to disk and a third for tape into the same SAN. You can then use zoning to zone the tape access to the tape HBA.
Chris
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