Data Archiving on Jabba

Jabba Usage

For using the system, you must have an account on Jabba. Contact your system manager and ask him for such an account. If you have an account, Jabba can be accessed via NFS:

/usr/jabba/backup/<institute>/<username> resp.
/usr/jabba/archive/<institute>/<username>

Please note the following:

• Jabba is a huge file system and should not be used as a one-one copy of your files. Please use tar or zip to store your backups and archives.
• Files should not be bigger then 5 to 10 GB. (Under Windows you can use winzip to split the files.)

To backup/archive your files via NFS, do the following:

tar cfv - <Directory> | /usr/isgtc/bin/tubasplit --size 5056 /usr/jabba/backup/tik/hans/file.tar

To archive/backup your files, you can use the following alternatives:

• Via Samba (\\jabba\[username])

• By remote-copy (scp)

• Via ftp (not recommended)
• and via ssh

Via ssh, archiving your files can done the following way:
Note: If you have an official jabba-account you should prefer the NFS-way. Because the ssh-way causes to much load on 'jabba'!

tar cfv - [Directory] | ssh jabba "/usr/isgtc/bin/tubasplit --size 5056  /usr/jabba/backup/tik/hans/file.tar"

Two different storage areas are provided

* archive : Every file you put into the archive directory (partition) will be stored twice on two tapes, 5 minutes after the last modification.

* backup : Files write into the backup directory (partition) will only be saved to one tape and 30 minutes after their last modification on harddisk.

In both cases the files on harddisk will be deleted (after storage on tape) only if the threshold of free disk space on the partition is reached. The idea of this two methods of storage is, that you can define how much security you need for your data by choosing the name of the directory. There are several methods to transport the files to the jabba. You can use ftp, ssh (secure shell) or scp (secure copy) or your system manager can mount the directories on jabba using NFS on your own machine. If you want retrieve your files, its only necessary that you call it in the appropriate directory. If the inode leaves on the harddisk (even when the file is stored on tape and deleted on harddisk), the filename leave in the directory and will recopied automatically from tape to the harddisk when you call it.

User commands

The data transfer between harddisk and tape storage can be influenced with the following commands:

-sls an extended version of GNU ls for listing directory information

-sdu an extended version of GNU du

-archive set archive attributes and archive files

-release release disk space and set release attributes

-stage set staging attributes and copy off-line files to harddisk

-ssum set file checksum attributes

Note: You must be logged in on Jabba to use these commands. Certain options are only available to the super user. Please consult the man pages on Jabba for more detailed information.