Reserving Space on Disk

[Paul Davey]

If you using SunOs, (and other systems supporting NFS booting) would
not mkfile(8) be suitable?

     mkfile creates one or more files that are suitable  for  use
     as  NFS-mounted  swap  areas,  or  as local swap areas.  The
     sticky bit is set, and the file is  padded  with  zeroes  by
     default.   The  default  size  is  in  bytes,  but it can be
     flagged as kilobytes, blocks, or megabytes, with the  k,  b,
     or m suffixes, respectively.

OK so it's meant for NFS swap, but its esentially a (contiguous?)
totally allocated file. I don't see that you couldn't use it for any
other purpose.

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