jeremym@syma.sussex.ac.uk (Jeremy Maris) (10/09/90)
I would like to be able to backup all our filesystems overnight to an Exabyte and be able to restore directory trees, as distinct from a complete filesystem, without too much bother. We have 6 ~250Mb partitions and use CAP to provide an AUFS file server to Macs. Dump is a bit of a pain for anything other than security backups of file systems, because of the crude nature of restor, and can only write one filesystem per tape in its vanilla form. Tar has the 100 char filename limit, so I'd have to hack GNUtar to allow for the large filenames used by CAP/AUFS. Three questions: 1) What do people use for multiple dumps to Exabyte ? 2) Are there any fancy interfaces to restor to allow easy restoration of a directory tree ? 3) Is there anything with the flexibilty and robustness of VMS Backup available for Ultrix/Un*x ( ie journal files,checksums, redundancy, a gogol of selection options) ? Thanks, --- Jeremy Maris,Experimental Psychology,University of Sussex,Brighton,England. Janet: jeremym@uk.ac.sussex.syma Nsfnet: jeremym@syma.sussex.ac.uk Bitnet: jeremym%sussex.syma@ukacrl.bitnet UUCP: ...ukc!syma!jeremym
hackwort@dg-rtp.dg.com (Brian Hackworth) (10/10/90)
In article <3597@syma.sussex.ac.uk>, jeremym@syma.sussex.ac.uk (Jeremy Maris) writes: |> Three questions: |> |> 1) What do people use for multiple dumps to Exabyte ? An enhanced version of dump(1M) that handles physical EOT. We put a crude table of contents at the front of the tape listing the names of the file systems on the tape. Then we invoke the enhanced dump for each file system, each time writing to the no-rewind tape device. |> 2) Are there any fancy interfaces to restor to allow |> easy restoration of a directory tree ? No need for a fancy interface. Check out restore(1M)'s "x" flag to extract only named files. If the "named file" is a directory, the directory and all its contents are recursively extracted. This sounds like what you're asking for. The "i" interactive flag is also handy for recovering only a few files -- in allows you to "cd" around the dump tape, selecting only the files or directories you want to extract. The only tricky part is figuring out the correct file system for the directory you're interested in, and spacing around the tape to find the start of that file system. |> 3) Is there anything with the flexibilty and robustness of |> VMS Backup available for Ultrix/Un*x ( ie journal files,checksums, |> redundancy, a gogol of selection options) ? I don't know anything about VMS Backup. Journal files are trivial to create if you're writing a shell script around dump and restore. dump already performs checksums. dump and restore don't do software redundancy, but most new tape drives support some sort of error detection to let you know if you haven't really saved what you thought you saved. I'm not sure how useful a gogol of selection options are; the dump model of backing up all that has changed since the last backup seems to be pretty reasonable. -- Brian Hackworth Data General Corporation hackworth@dg-rtp.dg.com 62 T. W. Alexander Drive ...!mcnc!rti!dg-rtp!hackworth Research Triangle Park, NC 27709 (919) 248-6143
henryc@oar.net (Henry Clark) (10/11/90)
In article <3597@syma.sussex.ac.uk> jeremym@syma.sussex.ac.uk (Jeremy Maris) writes: > 1) What do people use for multiple dumps to Exabyte ? Dump. (use the no-rewind device or use mt to position the tape) > 2) Are there any fancy interfaces to restor to allow > easy restoration of a directory tree ? Use restore in an interactive mode and you can restore whatever files/trees you wish. > 3) Is there anything with the flexibilty and robustness of > VMS Backup available for Ultrix/Un*x ( ie journal files,checksums, > redundancy, a gogol of selection options) ? One of the nice things about Unix is its simplicity. Henry henryc@oar.net
bachesta@bcstec.UUCP (Jim Bachesta) (10/11/90)
In article <3597@syma.sussex.ac.uk> jeremym@syma.sussex.ac.uk (Jeremy Maris) writes: > >Three questions: > > 1) What do people use for multiple dumps to Exabyte ? > 2) Are there any fancy interfaces to restor to allow > easy restoration of a directory tree ? > 3) Is there anything with the flexibilty and robustness of > VMS Backup available for Ultrix/Un*x ( ie journal files,checksums, > redundancy, a gogol of selection options) ? > At our site we have about 30 gigabytes of disk space. We use dump and restore exclusively for our backup needs. The way we get multiple dumps to is as follows: o Use the "non rewind" device for our 8mm tape unit. o call a script from cron that consecutively performs a backup to the 8mm tape unit. We can backup all 20 of our drives to two tapes this way. It is only a daily bakup, but it works unattended. Since the tape dosn't rewind after each dump, the next dump continues where the previous dump ended. - To restore just use the "s" feature of restore. This skips file marks to the desired dump on the tape. Restore can handle a file tree easily. Use the interactive switch when you start the restore (i.e restore -i /dev/nrmt2h ). You will be placed at the the "restore>" prompt. To select a tree simply "add" the node where the tree begins: restore> add node As far as VMS backup goes, I am not aware of any products out there to support that type of environment. James Bachesta Boeing P3 Update IV Project bachesta@trident.boeing.com