Logical volume size
The default logical volume sizes are 400 and 800 MB, which correspond
to the supported 3490 media types of Cartridge System Tape (CST) and
Enhanced Capacity Cartridge System Tape (ECCST). A different maximum
logical volume size can be defined that will override the default for
that media type when that volume is mounted. Defined sizes other than
the default media type are 1000, 2000, and 4000 MB (where a MB is
1024x1024 bytes). A logical volume's maximum size can change when it is
mounted as a scratch volume again.
Use of this capability requires installation of the Advanced Policy
Management feature on the VTS. Host application configuration-related
changes may also be necessary to fully utilize the larger logical volume
sizes. To support the 4000 MB volume size, a VTS Model B20 with a cache
configuration of at least 1728 GB and attached 3592 Tape Drives are
required.
Note: This function is disabled if the High Capacity Cache feature is
installed.
High capacity cache options
The High Capacity Cache feature (#4020) indicates to the VTS that it
is being used as a replacement for the 3995 Optical Library. The VTS
will configure its caching controls based on this feature. The physical
capacity is expanded to 6.7 TB through the replacement of the 36 GB Hard
Disk Drives (HDDs) in the VTS Model B20 with four drawers of 146 GB HDDs.
The logical capacity is configured to store up to 1.67 TB of data, more
than the maximum storage capacity of a single 3995 Model C38 Optical
Library. The corresponding logical volumes needed to support this
capacity are set to 2000 (based on usage of the 800 MB capacity logical
volumes).
The Expanded Storage Capability feature (#4021) expands the available
storage capacity of a VTS with the High Capacity Cache feature. Each
addition of this feature increases the storage capability by 1.67 TB and
also increases the number of logical volumes supported by 2000. From
zero to three of these features can be installed.
The High Capacity Cache feature is available only on a new factory
order of a VTS Model B20. A VTS Model B20 with the High Capacity Cache
feature cannot be used in a PtP VTS configuration. Use of the High
Capacity Cache feature requires the attachment of 3592 Tape Drives, or
3590 Model E1A or H1A Tape Drives, to the VTS. Also you must have four
ESCON or FICON channel attachments. The Advanced Policy Management
features can be installed on a VTS with the High Capacity Cache.
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Up to 8 ESCON channels
Up to 16 FICON or ESCON channels
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A maximum capacity of 250,000 logical volumes
A maximum capacity of 1,000,000 logical volumes
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Configuration 1 (B20/B18) 4 VTCs 4 VTCs
Configuration 2 (B20/B18) 8 VTCs 0 VTCs
Configuration 1 (B20/B20) 2 VTCs 2 VTCs
Configuration 2 (B20/B20) 4 VTCs 0 VTCs
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The IBM TotalStorage Virtual Tape Server (VTS) is a premier tape
solution for:
The IBM TotalStorage Virtual Tape Server (VTS) tape solution is well
suited for:
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- Reduced operating costs, such as:
- Low operating costs, such as:
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- Reduced batch window
- Reduced floor space consumed by tape operations
- Improved operational quality
- Increased level of tape automation
- Improved tape data availability
- Fast access to data
- Cross server data sharing
- Remote dual copy for use with:
- Small batch window
- Small amount of floor space consumed by tape operations
- High operational quality
- High level of tape automation
- Excellent tape data availability
- Fast access to data
- Cross server data sharing
- Remote dual copy for use with:
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- GDPS
- Geographically Dispersed Parallel Sysplex (GDPS)
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VTS incorporates extensive self management capabilities consistent
with IBM eLiza project initiatives. Self management facilities include
self optimization, self configuration, self healing, self protection.
These capabilities can reduce the cost of a VTS solution, minimize the
impact of errors, and provide protection. A VTS can help improve the
efficiency of mainframe and open systems tape operations by efficiently
using disk storage, tape capacity, and tape speed, and by providing a
large number of tape addresses. Two models, the B10 and B20, provide a
wide range of configuration options to address the needs of small and
large customers. The VTS allows you to standardize on a single tape
technology across multiple diverse hardware and operating systems.
Elimination of heterogeneous tape technologies such as DLT, 8mm, or 4mm
tape should simplify operating procedures, allow data sharing, and reduce
the cost of growth. These benefits make VTS a suitable repository for