Thanks Vince.
Speaking of reel tapes, I was at a datacenter earlier this year and saw
a large room for tape processing. When I walked in it was like walking
back to the 1990's. There was a human operator 24x7 watching multiple
3270 consoles for manual tape mounts on various devices including 3480
and 3490 boxes. But there were no round tapes - the operator said they
had gotten rid of the last one - only 5 years ago!
Vince Getgood wrote:
Lizette is correct -
The DLm is essentially just a device that represents tape drives to the
mainframe. It needs backend storage, such as a DataDomain or Vmax to actually
store the tape data.
When a tape is requested, the mainframe asks the DLm, which "passes through" the request to the backend storage, which then opens a Unix file (in a proprietary data format).
It's possible to attach a "real" (or possibly even "REEL") tape drive to the DLm / backend storage, and copy data off.
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