topic Re: Write TAR/BACKUP to RAW Disk(VMS), Read on UNIX (HPUX) - Possible? in Operating System - OpenVMS

Write TAR/BACKUP to RAW Disk(VMS), Read on UNIX (HPUX) - Possible?

Alzhy — Fri, 17 Oct 2003 07:47:40 GMT

As out network bandwidth between our VMS systems and UNIX systems are just 10 Mbps, we have a need to periodically copy large datafiles (mostly ASCII and graphics files) from VMS to UNIX as part of a migration. As the environments are connected to the same SAN, we can present LUNS that are both available on the two environments - and we'd like to use these LUNs accordingly - use it as a RAW evice for VMS tar or backup utility and read it off an HPUX server.
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Is this possible?
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Anyone done this yet?

Re: Write TAR/BACKUP to RAW Disk(VMS), Read on UNIX (HPUX) - Possible?

Antoniov. — Fri, 17 Oct 2003 11:08:22 GMT

Hi Nelson,
I don't known system you have described but AFAIK tar and backup are not compatibile.
You could see
http://h71000.www7.hp.com/wizard/wiz_2311.html
http://h71000.www7.hp.com/wizard/wiz_2162.html
and you can find VMS tar reading
http://h71000.www7.hp.com/wizard/wiz_0880.html

Thees are only clues no solution.
Bye
Antoniov

Re: Write TAR/BACKUP to RAW Disk(VMS), Read on UNIX (HPUX) - Possible?

Martin P.J. Zinser — Fri, 17 Oct 2003 11:35:49 GMT

There is no such thing as a "raw" device under OpenVMS, disks are always formatted either as ODS-2 or ODS-5 volumes. You might get away using th program that allows you to read ODS-2 structured disks on Unix.

Check here for availablity:

http://www.goatley.com/hunter/w2k.html

(Yupp, W2k, since it is also available for Windows).

Else you could write a Tape on VMS and read that on the Unix box. Also since you refer to ASCII data, compressing them using Zip might allow you to use your slow network nevertheless.

Re: Write TAR/BACKUP to RAW Disk(VMS), Read on UNIX (HPUX) - Possible?

Antoniov. — Fri, 17 Oct 2003 11:37:35 GMT

Hi Nelson,
if you have TCP/IP installed on VMS you also have two ways:
1) using FTP, you should write som script to transfer files;
2) activate NFS if is avaiable on unix; in this case the NFS volume is accessible by unix and vms in the same SAN.
Alternativly there is a software calles samba to exchange data between different OS.

H.T.H.
Antoniov

Re: Write TAR/BACKUP to RAW Disk(VMS), Read on UNIX (HPUX) - Possible?

Hein van den Heuvel — Fri, 17 Oct 2003 12:12:00 GMT

This exercise is on my 'list of things to do some day'. Sofar I have gotten by with a network link. But I'd like to try the 'raw' device solution for say a ZIP or TAR archive, as well as for an Oracle data file.

How about using an intermediate, non-native-to-either, file structure? Like a PC FAT structure? There are tools on both VMS and Unix for that no?

>There is no such thing as a "raw" device
> under OpenVMS, disks are always formatted > either as ODS-2 or ODS-5 volumes.

Nonsense! Of course there are raw devices!
You can just open "DKA100:". You'd need LOGIO priv, and it is not done much, but hey it can be done!
Check out DUMP/BLO=(STA:x,COU:y) dev:
That using a disk as a raw device!

And you can even use DCL. As prove I submit a little Hack i wrote once when my MFD [0,0] 'accidently' lost it's directory attribute, after which you can only use the disk as raw device!

================================================================================
Note 3098.3 SET FILE/NODIR [000000]000000.dir ! 3 of 4
xxx::VANDENHEUVEL "Things that make you think, Hmmm" 30 lines 6-DEC-1994 11:08
-< Nothing a little DCL could not fix :-) >-
--------------------------------------------------------------------------------

Hmmm,
Fixing a hosed 000000.DIR file header sounds just the thing for PATCH.
Lacking that on Alpha, why not use for a little DCL instead.
Something along the following lines should do:

$mount/for mess:
$open/read/write broken mess:
$x="1234"
$x[0,32]=1
$read/key=&x broken home
$ibmaplbn = f$cvsi(24*8,32,home)
$ibmapsize = f$cvsi(32*8,16,home)
$x[0,32]= ibmaplbn + ibmapsize - 1 + 4 ! MFD = (4,4), VBN = LBN -1
$read/key=&x broken mfd
$filechar= f$cvsi(52*8,32,mfd)
$fid = f$cvsi(8*8,32,mfd)
$write sys$output f$fao("!XL !XL", fid, filechar) ! 0004004 00000080
$mfd[52*8,32]= filechar + 8192 ! FCH$M_DIRECTORY
$check = f$cvsi(510*8,16,mfd)
$mfd[510*8,16]= check + 8192
$write/update/symbol broken mfd
$close broken
$dism/nounl mess
$moun mess presto!

-------------------------------------
Cheers,
Hein.

Re: Write TAR/BACKUP to RAW Disk(VMS), Read on UNIX (HPUX) - Possible?

Martin P.J. Zinser — Fri, 17 Oct 2003 14:06:33 GMT

Hello Hein,

very impressive hack, but have you actually ever tried to put (and read) data on such a "raw" device in a tar archive or backup saveset? ;-)

Greetings, Martin