[Info-vax] Request description of UFS for VMS person

[Bill Gunshannon]

In article <36821cb7-714a-4749-9deb-b772eddacbf5 at b6g2000pre.googlegroups.com>,
	AEF <spamsink2001 at yahoo.com> writes:
> On Apr 29, 7:17 pm, "Bob Eager" <rd... at spamcop.net> wrote:
>> On Wed, 29 Apr 2009 12:43:42 UTC, AEF <spamsink2... at yahoo.com> wrote:
>> > The primary one I can think of is that everything on the volume really
>> > *is* a file. Everything in the volume is "transparent". In Unix, at
>> > least the ones I have access to I don't know how to dump the super
>> > block or inodes. And on one of them I can't even dump a directory!
>>
>> > So can you or anyone else tell us more of the advantages? And on the
>> > Unix side if there is a way to read the super block and inodes? So
>> > much for "everything is a file in Unix".
>>
>> Simple.  The whole *disk* is a file. Open it, and you can seek to any
>> block on the disk, the read/write it.
> Is the entire system a file, too? Just open it up and you can see
> everything! :-)

WHat do you mean by the entire system?

> Re the disk:
> What do I do?
> $ cat <name of disk>

If you wish and have the needed permissions.

> $ od <name of disk>

If you wish and have the needed permissions.

> And od can't even read a directory on some systems!

That is a special case apparently added at some point.  Probably to
protect the user from him/herself once Unix stopped bing the doamin
of people who actually knew what they were doing.

triangle# disklabel ad0s1
# /dev/ad0s1:
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  a: 10240000        0    4.2BSD     2048 16384 28552 
  b:  4096000 10240000      swap                    
  c: 156296322        0    unused        0     0         # "raw" part, don't edit
  d: 10240000 14336000    4.2BSD     2048 16384 28552 
  e: 10240000 24576000    4.2BSD     2048 16384 28552 
  f: 121480322 34816000    4.2BSD     2048 16384 28552 

triangle# cat /dev/ad0s1c|od -c|more
0000000  353   <  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0 002  \0  \0  \0
0000020   \0  \0  \0  \0  \0  \0  \0  \0 022  \0 002  \0  \0  \0  \0  \0
0000040   \0  \0  \0  \0  \0 026 037   f   j  \0   Q   P 006   S   1 300
0000060  210 360   P   j 020 211 345 350 307  \0 215   f 020 313 374   1
0000100  311 216 301 216 331 216 321 274  \0   | 211 346 277  \0  \a 376
0000120  305 363 245 276 356   } 200 372 200   r   , 266 001 350   g  \0
0000140  271 001  \0 276 252 216 266 001 200   | 004 245   u  \a 343 031
0000160  ......................

bill

-- 
Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
University of Scranton   |
Scranton, Pennsylvania   |         #include <std.disclaimer.h>