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тАО01-27-2004 03:22 AM
тАО01-27-2004 03:22 AM
remote backup
I want to take the remote backup on tape. Let me explain my problem in detail. I have a system A which has 3 disks , but no tape drive. I have system B , which is having tape drive MUA0 . Now I want to take image backup of all the 3 disks of A on tape drive of system B. The problem is whatever qualifier I use ( /label, /ignore=label , /noinit , /norewind...etc...) , the remote tape is always initialzed with blank label . i.e. after backup command completes, when I dismount & remount the tape, is shows blank label. I do not have any other backup layered product ( like ABS, SLS ..etc..) nor want to purchase them. The backup command I use on system A is :
$backup/image/log/ignore=(interlock,noback) $1$DIA0: B"system password"::$1$MUA0:dia.sav/save/label=b_bck
Please suggest how to take remote backup on tape. VMS version is 7.1 on both nodes.
Also , In documentation, I have read about network save set, which describes about Files-11 only. Does, it means, network save-sets cannot be created on tapes ??
Thanks & regards,
Lokesh
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тАО01-27-2004 04:08 AM
тАО01-27-2004 04:08 AM
Re: remote backup
I think you have to limit the block size due to DAP limitations parhaps to less lan 32k.
See decuserve e.g.
http://eisner.encompasserve.org/htbin/dnqindexform?kw=remote+backup+to+tape&fh=1&mh=10
there may be something.
Purely Personal Opinion
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тАО01-27-2004 04:13 AM
тАО01-27-2004 04:13 AM
Re: remote backup
I think the problem is with remotely mounting the tape. I have remotely backed up systems to disk and then moved the file to tape on the remote system. We also have used the remote tape facility in Multinet to remotely mount the tape and perform backups over the net. Are you using the Multinet IP stack or another?
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тАО01-27-2004 04:13 AM
тАО01-27-2004 04:13 AM
Re: remote backup
AFAIK backup to remote node is only supported to disk. Depending on disk space you could do your image backup to a saveset on disk on the remote system and then copy that to tape. To restore you would need to do the reverse.
You could investigate freeware products that allow you to "serve" tape drives. There is a product called ZT available from http://vms.process.com/scripts/fileserve/fileserve.com?ZT . I have no experience of it but it may provide a solution to your problem.
HTH
ML
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тАО01-27-2004 04:41 AM
тАО01-27-2004 04:41 AM
Re: remote backup
1) client starting:
the client has a procedure containing a
command similar to
$ backup input remote::"task=rmtape"/sav/block=4096
on the server (the node remote), the object rmtape will have
allocate tape
init tape
mount tape
convert sys$net/fdl=... tape:file.bck/fdl=...
this method has a drawback: if the allocate, init, mount... is too long, the backup will fail.
a better method is to let the server start
2) server starting
the server will have a procedure containing
allocate tape
init tape
mount tape
convert client::"task=rmtape"/fdl=... tape:file.bck/fdl=...
the object rmtape will have a command similar to
backup input sys$net:/save/block=4096
on the client side, you will create a net backup account (with sysprv and readall)
here the decnet link will be estblished only when the tape will be ready.
Decnet used to limit the save set size to 4096, I do not know if this still applies.
in the default account of this user, a procedure rmtape.com containing
$ backup/qualifier disk sys$net:/save/block=4096
$ exit
create a ncp obj (or in ncl a session control application)
mc ncp
def obj rmtape number 0 file rmtbck.com user nobody password invalid
set obj rmtape all
All this comes from old notes, but should apply.
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тАО01-27-2004 11:40 AM
тАО01-27-2004 11:40 AM
Re: remote backup
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тАО01-28-2004 02:05 AM
тАО01-28-2004 02:05 AM
Re: remote backup
Many thanks for your kind suggestions. I have installed SLS now on my systems and using this (RDserver/rdclient) to take backup on remote tape.
Thanks & regards,
Lokesh