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This suggestion seems too obvious - but could you:-
1. Take the incremental backup on the source server (perhaps tarring the files together).
2. Transfer it to the destination server,
3. Write it to the LTO.
I'm assuming you are not backing up full tapes via this method as this wouldn't really be feasible.
All this file transferring without confirmation that its worked, means that you need
to retain the files on the source server, until you know it's properly backed up on tape.
Not tried it - but the following might work if you have a network connection.
You could set up NFS (Network File System) server/client processes on the two
servers, thereby gaining access to selected devices on the remote server.
I'm not convinced that it would be all that speedy though.
If the LTO can't operate in a proper streaming mode it could be very slow indeed.
It's quite a few years since I've used tape backups...
Big systems use expensive NAS/SAN setups.
Last edited by JeremyBoden; 04-17-2014 at 02:30 PM.
Distribution: Debian Wheezy/Jessie/Sid, Linux Mint DE
IIRC backup applications like Amanda or Bacula can do this. But both packages are a complete backup framework. Only reading through the manuals and understanding them takes considerable time. Deploying this is not to be taken lightly, but it should work.
Depending how critical this is, it might be a much too heavyweight tool.
Any backup method is going to need a way of transporting the data to the remote server.
How do you plan to label and rotate your tapes?
Whilst this is possible to do manually, it is virtually impossible to reliably.
The method you use depends upon how valuable the data is to you.
For modest amounts of data usage of "The Cloud" plus tape backups may be a simple solution,
provided you can write a script to track tape usage.
I may be misunderstanding you here, but how many different tapes do you own for your LTO?
You need an absolute minimum of 7 tapes (5 for incremental backups, 2 for full monthly backups).
More would be better.
What happens if a tape gets destroyed?
I had assumed that you could identify your incremental data.
A full tape backup system could do this.
If you are backing up entire files, you could file identify changes (in a script say) by:-
1. Checking file modification date (probably OK),
2. Comparing checksums e.g. md5 against a list of previous checksums - pretty reliable.
You would transfer data between the servers using whatever method you use to move data around.
The backup software depends on how valuable the data is to you.
@JeremyBoden i am having only 1 tape in LTO and i want to take backup using norewind(/dev/nst0) method so that it will not overwrite already existing content. whenever we write in tape it will written in new file.
first i will take full backup using norewind(/dev/nst0) method and after that incremental backup in the same tape.
Do you trust your tape drive to never, ever chew up your tape?
What happens if your system fails half-way through a full backup?
Will you have any accessible backups?
Is your system secure against power failures?
It is simply not possible to get by with a single tape for any backup system.
It will fail eventually - probably when you most need it to work.
Since you have two servers (hopefully completely independent ones), why not hold backups on the remote server disk storage?
It's very simple to do and rather more robust than appending backups to the end of backups.