Read Sun's tapes to IRIS?

[Naiming Shen]

I have two questions. first, the IRIS manual say there is two types
of archive: cpio and tar. When I use system manager tool(on IRIS 4D/310)
there is only tar can be used. I don't know why.
Second, I have a tape from Sun workstation(I don't know what format that
is) and I want to read it into IRIS, but the IRIS couldn't read it.
Can somebody tell me what kind of format the IRIS can read? I was told
I can change some switchs in a configuration file for tar, what is the
file, how can I change it?
Thanks in advance.
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  Naiming Shen
  naiming at bagend.eng.umd.edu
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