What is cool is when you have multiple lpars, each thinking it has a library which looks like this:
WRKMLBSTS
Device/
Resource
KDVLVTL
TAP35
TAP36
TAP37
TAP38
TAP39
TAP40
TAP41
TAP42
Basically one tape library with 8 drives.
And it fires off a parallel back up writing to a couple of those drives at the same time.
Now picture a couple of other lpars doing the same thing at the same time.
And you have one port coming out of your Power system supporting all these lpars. This single cable goes to that switch. From that switch there's a single cable going to the VTL.
Now, add in another Power system doing the same thing. So now you have two power systems talking to the switch and still a single cable to the VTL.
Now, add in an AIX lpar running IBM Spectrum Protect (formerly TSM) talking to that Data Domain not as a VTL but otherwise and over TCP/IP using other connection and using the DD as one of it's tiers. IBM Spectrum Protect is used to back up all of our PC's and servers.

Yeah, we get our money's worth out of this box.

Rob Berendt

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