jcm8_cif@troi.cc.rochester.edu (Judy Mathers) (05/29/91)
We just got a DAT drive at work, and we'd like to run dump for backup. Currently we are just tarring everything to tape which is a bit slow and inefficient. I was wondering if anyone had used dump and can supply the necessary parameters. -judy jcm8_cif@cc.rochester.edu uunet!rochester!ur-cc!jcm8_cif
gabby@gabs.lbl.gov (Gabby Obegi) (05/30/91)
In article <14272@ur-cc.UUCP> jcm8_cif@troi.cc.rochester.edu (Judy Mathers) writes: >We just got a DAT drive at work, and we'd like to run dump for backup. >Currently we are just tarring everything to tape which is a bit slow and >inefficient. I was wondering if anyone had used dump and can supply the >necessary parameters. We've got twelve 9000 s300/400 servers with a total of over 10 Gigabytes that we've been backing up on an Exabyte using the dump command. We've been doing this for more than a year now and it's worked very well. Here are the commands we're using, followed by what you should do with them: For a local dump - /etc/dump ${dump_level}budfs 20 54000 ${device_file} 6000 / To dump a remote disk onto the local tape - remsh ${remote_host} "/etc/dump ${dump_level}budfs 20 54000 - 6000 /" | \ dd obs=20b of=${device_file} The above commands contain variables used in our backup script; replace these with what you need. Explanation of command line arguments: dump_level - dump wil backup any file that is newer that the last dumpdate of the same level or lower. So, use dump_level 0 for a base backup and a dump_level higher for incremental backups. b - specifies block size. 20 is standard. u - write the date and time to /etc/dumpdates, only if it completes successfully. d - This is a density option. It's used to calculate the amount of tape being used and has no affect on the way the data is written. f - allows you to specify the outfile name or device file name. s - The size of the dump tape in feet. We use 6000 for 2.2 Gbytes, I suggest you try 3500. These command should do the job, but if you'd like more information on the backup scripts we use, let me know. ============================================================================= Gabby Obegi, CAE Systems Manager Lawrence Berkeley Laboratory MS 90-2148 (415) 486-5209 1 Cyclotron Rd Fax: (415) 486-6668 Berkeley, CA. 94720 Internet: G_Obegi@LBL.gov ============================================================================= -- -Gab