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STORE and TurboSTORE/iX Products Manual: 900 Series HP 3000 Computer Systems > Chapter 6 STORE and TurboSTORE/iX Command OptionsTurboSTORE/iX II Options |
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The following options are available only if the TurboSTORE/iX II product is purchased. In addition to all of the STORE options, the following additional options are available with TurboSTORE/iX II. For more information on purchasing TurboSTORE/iX II, contact your Hewlett-Packard sales representative.
With TurboSTORE/iX II (and TurboSTORE/iX 7x24 True-Online Backup), backup performance can be improved through the use of host data compression. By specifying the COMPRESS parameter, the host system filters the data through a compression algorithm prior to writing it to the backup device. This operation has two effects:
Two levels of compression are supported by the COMPRESS parameter: HIGH and LOW.
You must determine which of the compression algorithms best suits your needs. In some cases the low-compression algorithm may perform almost as well as, or better than, the high-compression algorithm. It is advisable to try both algorithms on your data in order to evaluate which algorithm best suits your needs. Some of the factors to consider are:
Be advised that when performing backups with the high-compression algorithm, the backup can consume much or most of the processing capabilities of the machine. The exact amount of system resources consumed depends on your system speed and multi-processor configuration. Using the low-compression algorithm demands less system resources, so it is easier for other activity to coexist with the backup. Use the high-compression algorithm if backup time is dedicated or if the difference in the amount of media used for backup is substantial enough to warrant the complete consumption of the machine. When compressed format files are restored, RESTORE automatically recognizes the compressed format and restores the files properly. To compress data when storing files to backup, use the FILE command, then use the COMPRESS parameter in your STORE command. For example:
To compress data when storing files to magneto-optical disks, use the MOSET and COMPRESS parameters in your STORE command. For example:
TurboSTORE/iX II allows you to store backup data to magneto-optical (MO) devices. This is done by using the MOSET option to specify which MO devices should be used for the backup. The NAME option is used to associate a logical name with the backup. This name is used during the restore process to identify which backup should be used. These options are discussed in detail in Chapter 3, "Preparing Storage Devices". Please refer to that chapter for more detailed information on using the MOSET and NAME options. |
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