donna mentioned...

>!if finfo("sysstart","ldev") <> 1
>!  main.pub.vesoft;info='altfile sysstart;dev=1'
>!endif

Notice that the above finfo call has a slight gotcha: It does
only check for the location of the file label of sysstart, but
does not check its actual file content placement (that could
be checked with DISPLAYEXTENTS in FSCHECK, for example).

The file extents can reside on other LDEVs than the file label.
For example, I have an STMXL.DIAG.SYS on one of our 3000s here
that has its file label on ldev 1, but contents on ldev 2:

:calc finfo("stmxl.diag.sys","ldev")
1, $1, %1

:listf stmxl.diag.sys,3
********************
FILE: STMXL.DIAG.SYS
 ...
NUM EXT: 4
 ...
DISC DEV #: 1
 ...
VOLCLASS  : MPEXL_SYSTEM_VOLUME_SET:DISC

fscheck: de stmxl.diag.sys

     SECT_ADDR   SECTS_IN_EXTENT  VOL_SET_INDEX  FILE_SECT_OFFSET
     ---------   ---------------  -------------  ----------------
     $00087BF0         256               2          $00000000
     $00088E50         256               2          $00000100
     $0008B5B0         512               2          $00000200
     $0008CAE0         400               2          $00000400

Nothing specific about STMXL, this file is just a randomly picked example.

Lars.

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