tar & fbackup

[srinivasa rao vaddadi]

Hello Experts,

1. while taking the backup of 25GB file using fbackup, i'm getting an error unable to recognize the volume.i'm sure that the tape is working fine.so what could be the problem.

2. can we take the backup of 25 GB using tar.
if so, what is the max limit using tar.

[Arunvijai_4]

#2. You can use GNU's tar to take 25 GB of backup.

http://hpux.connect.org.uk/hppd/hpux/Gnu/tar-1.15.1/

I think HP's "tar" will support upto 8 GB with PHCO_28992 applied.

-Arun

[lawrenzo]

maximum limit for a tar archive is 2gb therefor if posssible tar each individual directory tree if below 2gb.

and the unable to read volume could be to do with using a brand new tape.

try fbackup again if it fails post the command you are running.

[Joseph Loo]

hi,

what tape, i.e. DDS2, DDS3,etc were u trying to backup to? which version of UX?

is the 25GB one single file? for tar, there is a limit of 8GB, if u patch, read this:

http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000079976655

regards.

[Devender Khatana]

Hi,

Without patch - Tar limit is 2Gb.

With Latest tar commulative Patch - 8GB.

No way it can go beyond 8GB.

Why not use CPIO ?

Also the error using fbackup must be depending upon either the media/ drive or the format of media. It shall give the error only for first time.

HTH,
Devender

[lawrenzo]

check this thread for a possible solution to the fbackup problem:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=692310

and

http://www4.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&admit=-938907319+1094806340197+28353475&docId=200000062965761

HTH

[Bill Hassell · Accepted solution]

Some clarifications:

tar will backup many Gb of directories but the largest file can only be 2Gb. A recent patch for tar on HP-UX will allow files as large as 8 Gb to be saved. tar has very limited error checking so it should be not be used for production backups.

fbackup is a commercial quality backup program and has no limitations for file size. Since it has extensive error checking and recovery features, it will always read the tape before writing it. tar will instantly destroy a backup but fbackup will check that the new tape not a previously recorded tape in the same session. So the message that it can't read the header means that the tape does not have fbackup headers (might be a new tape or a tape with tar headers, etc).

As previously posted in the ITRC forums, you must always use a config file to match modern tape drives. The file should looki like this:

blocksperrecord 256
records 32
checkpointfreq 1024
readerprocesses 6
maxretries 5
retrylimit 5000000
maxvoluses 500
filesperfsm 2000

[srinivasa rao vaddadi]

Hello all

Thanks for the response.

hello lee,
we are using DDS3 and version is HPUX 11.11