rdump problems with AIX 1.2

rdump problems with AIX 1.2

Post by Gernot Ste » Thu, 13 Dec 1990 23:25:08

I have encountered considerable problems trying to dump PS/2 file
systems to an ExaByte tape drive operated by a remote SUN workstation.
Issuing the +rdump+ command will yield only a +permission denied+
message as a result, unless your machine+s root account is listed in
the +.rhosts+file of the remote machine+s root account. I found out
this is because AIX 1.2 uses the old version of the +rdump+ command,
while on the newer SUN version you can define the dump device as

as +machine:device+, invariably attempting to access the root account
of the remote machine. Scanning the object code of the AIX +rdump+
command we found the textual representation of the string +root+.
Yet, patching this to represent some other four character account
name did not turn out to be helpful.

The remote machine+s SysAdmin will not give us root permission
on his machine and mounting our file systems remotely on a SUN via
NFS will not help either, since dumps can only be performed on
physically attached file systems.

Are we condemned to back up on our 60 MB tape drive or has
anyone  encountered the same problem and/or has found a solution?
Any help will be gratefully appreciated.

| Gernot Stenz               Tel. (0)721-608-4329        |

| Institute for Logic, Complexity and Deduction Systems  |
| Am Fasanengarten 5         7500 Karlsruhe, FRG         |


rdump problems with AIX 1.2

Post by Ed Kubait » Thu, 13 Dec 1990 23:53:06

Am unfamiliar with PS/2 AIX 1.2, but if the Sun administrator will grant you
an unprivileged Sun signon, perhaps something like the following might work:

   o Permit the unprivileged Sun signon to rsh as root to the PS/2(/.rhosts)

   o on the Sun: rsh ps2 -l root /etc/dump ... | dd obs=... of=/dev/rmt...


Computing Services Office - University of Illinois, Urbana


rdump problems with AIX 1.2

Post by Eric Gigue » Fri, 14 Dec 1990 00:42:16

Well, one solution is to use tar and pipe it through a remote shell which
dd's it straight to the tape device.  It's not very elegant, but it does
work.  Here is what I use to dump an AIX tree to the Exabyte off our Sun:

where host is the name of the Sun.  I read the table of contents of the
tar back off the tape from AIX using:

And of course replacing "t" with "x" will extract the tree.  Dunno what
the optimal blocking factor is, but this works for me.


           Quoth the raven: "Eat my shorts!" --- Poe & Groening


1. AIX 1.2 is dead (was X server for PS/2 XGA under AIX 1.2)

I have heard from my spies in IBM (comments invited to confirm or deny):

1. PS/2 AIX is dead (no more new versions, except for bug fixes).

2. AIX has not been certified for the PS/2 90 and 95.

3. AIX will never be certified to work on the model 90 and 95.

4. Not said to me, but a conclusion of (3) is no support for XGA.

5. The only way to run Unix on the model 90 and 95 and have IBM's
   blessing is to run SCO's Open Desktop, with which IBM have a licensing

6. Future Unix versions for IBM PS/2s may be SCO's ODT or something similar
   from a joint development between IBM and SCO.

Mark Kosten (who denies having written the above)

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