HP-UX Reference (11i v1 05/09) - 1M System Administration Commands A-M (vol 3)

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fbackup(1M) fbackup(1M)

If sparse ﬁles are backed up without using data compression, a very large amount of media can be con-

sumed.

fbackup creates volumes with a format that makes duplication of volumes by

dd impossible (see dd(1)).

Copying an

fbackup volume created on one media type to another media type does not produce a valid

fbackup volume on the new media because the formats of volumes on raw magnetic tape, on a regular

ﬁle, and on rewritable optical disks are not identical.

When conﬁguring the parameter blocksperrecord

(see -c option), the record size is limited by the

maximum allowed for the tape drive. Common record sizes include 128 blocks for DLT and DDS tape

drives, and 60 blocks for the HP7980. Note also that the blocksize used in earlier releases (7.0 and before)

was 512 bytes, whereas it is now 1024 bytes. This means that the same value speciﬁed in blocksperrecord

in an earlier release creates blocks twice their earlier size in the current release; for example, a blocksper-

record parameter of 32 would create 16-Kbyte blocks at Release 7.0, but now creates 32-Kbyte blocks. If

blocksperrecord exceeds the byte count allowed by the tape drive, the tape drive rejects the write, causing

an error to be communicated to

fbackup which

fbackup interprets as a bad tape. The resulting write

error message resembles the following:

fbackup (3013): Write error while writing backup at tape block 0.

Diagnostic error from tape 11...... SW_PROBLEM

(printed by driver on console)

fbackup (3102): Attempting to make this volume salvageable.

etc.

DEPENDENCIES

NFS

Access control lists of networked ﬁles are summarized (as returned in st_mode by stat()), but not

copied to the new ﬁle (see stat(2)).

fbackup does not support QIC-120 and QIC-150 formats on QIC devices. If fbackup is attempted for

these formats, fbackup fails and the following message is displayed :

mt lu X: Write must be a multiple of 512 bytes in QIC 120 or QIC 150

AUTHOR

fbackup was developed by HP.

FILES

/var/adm/fbackupfiles/dates

database of past backups