[Linux-decnet-user] Re: Back-up VMS Linux

[Larry B. <ba...@us...>]

From any OpenVMS system, you can type HELP BACKUP to obtain detailed
information on the BACKUP program options.  Some options only apply to tapes
(like /REWIND or /NOREWIND), some only apply to the input disk (like
/IGNORE=INTERLOCK), some only apply to the output disk for disk-to-disk or
restore operations (like /OWNER=ORIGINAL).

I always ANALYZE/DISK before doing a backup and correct any problems with
the file system first.  I also only make backups on my system when no one
else is logged on.  The system manager of our timesharing OpenVMS system
does backups while people are logged on, which means he has to use
/IGNORE=INTERLOCK.

To make an image backup across DECnet of any disk but the system (boot)
disk, the command is BACKUP/VERIFY/IMAGE disk-name:
DECnet-node::remote-disk:[remote-directory]save-set-name/SAVE_SET.  This
assumes you use DECnet proxy logins.  If not, you have to replace
DECnet-node:: with DECnet-node"userid password"::.  The disk must be
mounted, but it can be mounted /NOWRITE.

To make an image backup of the system disk, change disk-name: to
system-disk-name:/IGNORE=INTERLOCK.

I haven't done any OpenVMS backups of my disks yet using linux-decnet; just
the test of my personal directory tree.  So, my instructions may have to be
slightly modified.  Also, my systems are dedicated for my projects, so I
only do full backups.  The system manager of our timesharing OpenVMS system
does both full and incremental backups.

I set up the fal server on my Red Hat 8.0 Linux system to use the .fal
hidden directory to store OpenVMS file attribute information: in
/etc/dnetd.conf, change the fal command to fal -m, then (re)start decnet.
In that case, I don't have to use any special file name suffix for a BACKUP
save set.  There are other options for fal which may affect you.  Look them
over and try it out first.  And, ALWAYS use the /VERIFY option!

To use NFS for backups, it is the same as a local disk-to-disk backup.  Your
NFS client package on OpenVMS should create a mounted disk volume, which you
can use like any other local disk, except for the differences between Unix
and OpenVMS file system semantics, such as version numbers, RMS, etc.  Look
at the manuals that came with your TCP/IP package for that kind of
information.  We use Process Software MultiNet V4.4; OpenVMS usually comes
bundled with TCP/IP Services for OpenVMS.

OpenVMS save sets are not compressed, and have extra XOR blocks added for
data recovery.  So, a 2 GB disk will take more than 2 GB to backup.  If your
NFS client/server combination supports only NFS version 2, you will not be
able to create a save set larger than 2 GB.  You'll have to try it with your
setup to see what works.  And, ALWAYS use the /VERIFY option!

Larry Baker
US Geological Survey



on 5/26/03 12:57 AM, Daniel Carrere at d.c...@me... wrote:


Hi Larry, 

Sorry for my question, I didn't see the other message.

I wanted to replace my tapes by an IDE disk on a Linux box;

Here is my command to save on tape

$ BACKUP/IMAGE /NOREWIND /LOG /IGNORE=(INTERLOCK,LABEL) DKA200:
MKA600:DKA200.BCK   /SAVE_SET /MEDIA_FORMAT=COMPACTION /OWNER=ORIGIN

As I am not a VMS programer, how can modify it to save by NFS ( my disk is
only 2 Go   Vas 3100-95 )

Thanks a lot, 

Daniel 


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