.tr {" .tr }. .SC TAPE~BACKUP~PROCEDURES September~14~1977 In addition to the backup packs created in the .B filesave , tape backups for each filesystem should be created once a week. One filesystem fits on each tape used, provided you are using your tape media at 1600 bpi. These tapes serve as long-term storage for files. .P The best way to make a backup tape is to make a copy of a Backup disk. This way tapes can be made while the system is available to the users. .HU "HOW TO MAKE A BACKUP TAPE" .L1 A backup pack for the filesystem of which you wish to make a tape copy must be physically mounted on the spare drive. If no spare drive is available, tapes must be made directly from the filesystem that is normally on-line, on a \fIsingle-user\fP system. This can be done immediately after the .B filesave. .L1 Tapes and packs for each backup should be found ahead of time. Tapes should not be reused before approximately 6-8 weeks. The correct backup pack and tape to use can be determined by checking the Disk and Tape Log(s). .L1 To create a backup tape for a filesystem a .B vc10 is performed (see \fBvolcopy\fP\|(VIII)).\*F .FS During the creation of a backup tape errors may occur. If ``read errors'' occur, the reliability of the disk pack is questionable. In any case the backup tape will be bad. Detailed description of these errors may be found below under RESTORING FILES FROM TAPE. .FE The type of device you copy to depends on the type of tape drive used: .br .if t .sp .5v .if n .sp .sp For a 800~bpi(TU10) tape drive, use: .br .in +5 .nf .UL "vc10 \fIfsname\fP /dev/rrp\fIX n packid\fP /dev/rmt0 \fItapeid\fP" .fi .sp .in -5 For a 1600~bpi(TU16) tape drive, use: .br .in +5 .nf .UL "vc10 \fIfsname\fP /dev/rrp\fIX n packid\fP /dev/rmt1 \fItapeid\fP" .in -5 .fi .BL .BI .I fsname is the filesystem name (e.g., .I a1 or .I root \|) } .BI .I X is the number of the disk drive on which the .I fsname or its backup is mounted. .BI .I n is the number of the section of the pack on which the filesystem resides (e.g., .I 0 , .I 1 , .I 2 , .I 3 , .I 4 , .I 5 , or .I 6 \|)} .br Examples: .VL 35 15 1 .LI /dev/rrp14 section 4 on drive 1 .LI /dev/rrp41 section 1 on drive 4 .LI /dev/rrp0 section 0 on drive 0 .LI /dev/rrp65 section 5 on drive 6 .LI /dev/rrp64 section 4 on drive 6 .LE 1 .BI .I packid is the five-character external pack label (e.g., p0452). .BI .I tapeid is the five-character external tape label (e.g., t0352). .BE .br Example: .if t .sp .5v .if n .sp .in +5 .nf vc10 root /dev/rrp0 p0450 /dev/rmt1 t0432 .fi .in -5 .L1 After backup tapes are created, packs should be returned to original locations and the tape identification numbers should be recorded in your Tape Log.