HP 3000 Manuals HP 3000 Manuals
TurboSTORE/XL II Features
TurboSTORE/XL II features include:
* More efficient backup and restoration routines using:
* Unattended backup.
* Online backup.
* Multiple device usage:
* Sequential backup.
* Parallel backup.
* Parallel device pools.
* Parallel restoration.
* Fast search capability.
* Reduction of media usage with:
* File interleaving.
* Data compression.
* Easier identification of backup media by using labeled tapes.
Unattended Backup
[REV BEG]
Unattended backup is provided through the support of both the HP Series
6400 Model 1300H DDS-format tape drive (part number C1511A) and the HP
Series 6300 Model 20GB/A Disk Library System, a Direct Access Secondary
Storage (DASS) device using magneto-optical disks (part number C1700A).
NOTE Support of the Series 6300 Model 20GB/A Disk Library System is
provided through TurboStore/XL II with Optical Support (product
numbers 36397A and 36398A).
DDS. [REV END]
Digital data storage (DDS) is a format for storing computer data on
digital audio tape (DAT) cassettes. Using the 1300H with TurboSTORE/XL
II, you can store up to 1300 Mbytes (1.3 Gbytes) of data in less than two
hours without operator intervention. When used in conjunction with the
high data compression option, the capacity of the DAT is increased to
nearly 4.7 Gbytes, and the potential backup rate is increased to over 2
Gbytes per hour.
[REV BEG]
DASS.
The Series 6300 Model 20GB/A Disk Library System combines 5.25-inch
rewritable optical technology with an autochanger mechanism. This DASS
device allows unattended backup of large quantities of data by providing
automatic mounting and retrieval of up to 32 magneto-optical disks. It
features two rewritable optical disk drives and physical storage for 32
rewritable optical disk cartridges. Up to 20.8 Gbytes of data can be
stored on a single library system. When used in conjunction with
TurboSTORE/XL II's low data compression option, the capacity of the DASS
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/XL II's high data compression option, the capacity of the DASS
is increased to almost 64 Gbytes of data.[REV END]
Online Backup
Online backup is a concurrent backup technique used to allow high data
availability by virtually eliminating downtime due to data backup. When
online backup is used, the STORE file set (files to be stored) is
attached to a log handler subsystem. User access to the data is
interrupted only during this "attach" phase usually taking about five
minutes. Once attached, the user has read, write, and purge access to
the files being stored. The "before" images of these files are logged
and stored on the tape during the online backup process. During the
RESTORE process, the file data and the log data are used to reconstruct
an image of the file as it was at attach time.
[REV BEG]
NOTE Online backup is optional and is available only with TurboSTORE/XL
II with On-Line Backup (product numbers 36388A or 36398A).
[REV END]
Multiple Device Usage
Multiple backup devices are supported and used for a single backup
routine. These devices may be used sequentially or in parallel.
Sequential Backup.
By specifying sequential usage of multiple drives, the backup system
stores to one drive while the others assigned to the tape set have their
reels changed, thus reducing backup time. This method of processing is
known as sequential backup.
Parallel Backup.
Backup time can be further reduced by increasing the number of
concurrently accessible storage devices. Instead of storing to one
drive, or a set of consecutive drives, multiple drives may be utilized to
perform data storage to multiple devices running in parallel.
Parallel Device Pools.
Parallel device pools give you the advantages of both parallel and
sequential devices. By specifying multiple sets of sequential devices
used in parallel, you can copy file subsets to different devices
simultaneously. Therefore, while one sequential device in the pool is
being used, another is always ready.
Parallel Restores.
RESTORE time can be reduced by increasing the number of concurrently
accessible devices. Instead of restoring from one drive, or from a set
of consecutive drives, multiple drives may be utilized to perform
parallel restores.
Fast Search
When using a DDS-format device, fast search capability is implemented to
provide you with the means to perform selective RESTOREs.
NOTE The DDS device must be configured as an HPC1501A or HPC1511A to use
the fast search capability.
[REV BEG]
When using a DASS device, access time is reduced to seconds because you
have direct access to the selected file to be restored.[REV END]
File Interleaving
File interleaving is a technique in which information from multiple files
is read concurrently from disk, is blocked together, and is stored to the
backup device in a single operation. Interleave format results in
greater performance, especially when used with high-speed backup devices.
Data Compression
TurboSTORE/XL II supports host data compression - a technique where the
host system filters the data to be stored through a compression algorithm
prior to writing it to the backup device. This technique increases the
device's effective transfer rate by transferring more data than the
device's maximum sustained rate. It also increases performance by
eliminating a portion of the time spent swapping media.
Labeled Tape
Labeled tapes are supported. You can back up your files to volumes
labeled according to ANSI and IBM standards, therefore providing you with
a means of identifying and tracking your STORE tapes (refer to "Labeled
Tapes" in appendix C for an illustration of the labeled tape format).