HP 3000 Manuals HP 3000 Manuals
Preparing Magneto-Optical (MO) Disks
TurboSTORE/iX II with Optical Support, product numbers 36397A and 36398A,
supports the use of the HP Series 6300 Model 20GB/A magneto-optical (MO)
device. The Model 20GB/A features two rewritable optical disk drives and
32 rewritable optical disk cartridges.
Use of magneto-optical disk is recommended for daily backup of large
volumes of data. When used in conjunction with TurboSTORE/iX II's low
data compression option, the capacity of the magneto-optical device is
increased to almost 40 Gbytes of data and the potential backup rate is
increased up to 2.8 Gbytes per hour. When used in conjunction with
TurboSTORE/iX II's high data compression option, the capacity of the
magneto-optical device is increased to almost 64 Gbytes of data.
Preparing for Backup to Optical Disk
When using the Model 20GB/A device, it is important that you ensure that
enough scratch media is mounted before you issue the STORE command. The
media preparation tasks are performed using the Magneto-Optical Utility
(MOUTIL), a utility program provided on the TurboSTORE/iX II product
backup. Use of the MOUTIL program is documented in the Magneto-Optical
Media Management User's Guide (36398-90001).
Determining the Number of Disks Needed
Each optical disk surface holds approximately 290 MBytes of uncompressed
data (depending on the type of data and assuming there are no bad sectors
on the disk). By comparison, 2400 feet of 1/2 inch backup holds
approximately 140 MBytes of data. Therefore, one optical disk surface is
equivalent to approximately two tapes. If your backup normally takes
four units of backup media, plan on using two optical disk surfaces.
You can estimate the number of optical disk surfaces needed by dividing
the total amount of disk sectors in use to be stored by 1,187,840.
1. First, use the DISCFREE command to determine the amount of disk
sectors in use on your system. For example:
_________________________________________________________________________________
| |
| :DISCFREE E,101 |
| |
| DISCFREE A.01.03 Copyright (C) Hewlett-Packard 1989. All rights reserved.|
| WED, OCT 31, 1990, 04:59 AM |
| |
| | Configured | In Use | Available | |
| -----------+-------------------+-------------------+-------------------+ |
| |
| TOTALS : |
| Device | 4464384 | 3136672 ( 70%) | 1327712 ( 30%) | |
| Permanent | 3906336 ( 88%) | 3002160 ( 67%) | 904176 ( 20%) | |
| Transient | 3348288 ( 75%) | 134512 ( 3%) | 1327712 ( 30%) | |
_________________________________________________________________________________
Figure 3-11. DISCFREE
In this example, a total of 3,136,672 sectors are in use.
2. Divide the total number of sectors to be stored by 1,187,840 and
round up to the nearest whole number to determine the number of
disk surfaces required.
3136672 / 1187840 = 2.6 disk surfaces
In this example you would need three disk surfaces.
Specifying the Magneto-Optical Device
When storing to a magneto-optical device, you do not use file equations
as you do when using backup drives. Nor do you use the STORESET
parameter to backreference the device. Instead, you specify that backup
is to be to the Model 20GB/A through the MOSET parameter of the STORE
command. Specify the LDEV number of the magneto-optical device as a
parameter to MOSET. For example:
;MOSET=(101)
or
;MOSET=(MO)
NOTE Actual LDEV numbers are only necessary if you have multiple
magneto-optical devices and you want to specify a particular
magneto-optical device. Using the keyword "MO" instead of a number
causes STORE to use the first available scratch media.
Naming the Backup
You can optionally use the NAME parameter of the STORE command to name
the backup with a name that logically relates the media as being from the
same backup. The name specified must be unique so that it can be found
when restoring files. For example, a monthly backup for September, 1990
on a system called "KING" could be named "MONTHLY.SEPT1990.KING". Note
that the backup name is a three-field name separated with periods. Each
of the three fields can be up to eight alphanumeric characters. If a
backup name is not specified, a default name is created using the time,
date, and system name. For example, "BK1130PM.D23OCT90.KING".
NOTE The backup name must be unique for RESTORE to be able to find it.
If media is removed from the magneto-optical device, use an external
label with the same backup name as you specified with the STORE command.
The media sub name of the MEDIASUB parameter to the MOUTIL command
SCRATCH is used to hold the media number and set number for each side of
the media.
Storing to a Single Magneto-Optical Device
The following example illustrates the STORE command to backup files to a
single magneto-optical device with the LDEV number 101.
:STORE @.@.@;;MOSET=(101);SHOW;NAME=BK1130PM.D23OCT90.KING
Storing to Multiple Magneto-Optical Devices
Multiple magneto-optical devices can be used in parallel (sequential use
is not recommended) for backup by specifying each magneto-optical device
drive with the MOSET parameter. For example, to use LDEV 102 and 103 in
parallel, the MOSET entry would be:
;MOSET=(102),(103)
For example, to use the first available media in parallel, the MOSET
entry is:
;MOSET=(MO),(MO)
Do not mix alphanumeric with numeric allocation requests. For example:
;MOSET=(M1),(102)
Storing to Parallel Magneto-Optical Devices
Storing to parallel magneto-optical devices is the recommended method of
using multiple magneto-optical devices. The following example
illustrates the STORE command entry to use two magneto-optical devices in
parallel.
:STORE @.@.@;;MOSET=(MO),(MO);SHOW;NAME=BK1130PM.D23OCT90.KING
With this usage, both drives will be active storing simultaneously.