HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 263

Data Redundancy Capacity, Data Transfer Rate, Disk Array Controller, Disk Module, Disks Not in Use

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Glossary Glossary Data Redundancy Capacity Data Transfer Rate Disk Array Controller Disk Module Disks Not in Use Disk Stamp Downing A Disk DRR Dynamic Data Migration Data Redundancy Capacity is the capacity required to support the RAID 0/1 and RAID 5 storage techniques used by the disk array for Data Redundancy. This capacity is managed by the Disk Array Controller and cannot be altered or reduced. The Data Transfer Rate is the speed at which data is transferred between a host computer system and a peripheral. The Disk Array Controller implements the HP AutoRAID™ Array Technology and Balancing of the data. The Disk Array Controller manages all data transfers to and from the host computer and also to and from each Disk Module. The disk array enclosure holds up to twelve Disk Modules. Each Disk Module contains a single hard disk assembly. A Disk Not in Use is any disk that is installed in the array enclosure but is not included in the array configuration. A unique identifying code written to each disk. The Disk Stamp identifies the disk as belonging to the set of disks installed in the array. The stamp is written to the disk when it is included in the array. The process of logically removing a disk from the array configuration. Typically done before testing a disk, downing a disk has much the same effect as physically removing it from the array enclosure. DRR, or Disable Remote Reset. When DRR is ON or enabled (default), it prevents a host SCSI reset from resetting both disk array SCSI buses. With DRR set to ON, disk array controllers are not allowed to reset their own SCSI bus, even if the host resets that controller. If DRR is set to OFF, a host SCSI reset will also allow that controller to reset both disk array SCSI buses. Dynamic Data Migration is the process of moving data that is accessed frequently (according to both the Disk Stamp and the Time Stamp, which is updated when the data is written) into RAID 0/1 space, which is optimized for performance, and also moving data that is accessed less often into RAID 5 space, which is optimized for its higher storage density. 263

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Glossary
263
Glossary
Data Redundancy Capacity
Data Redundancy Capacity is the capacity required to support the
RAID
0/1
and
RAID 5
storage techniques used by the disk array for Data
Redundancy. This capacity is managed by the
Disk Array
Controller
and cannot be altered or reduced.
Data Transfer Rate
The Data Transfer Rate is the speed at which data is transferred
between a host computer system and a peripheral.
Disk Array Controller
The Disk Array Controller implements the HP
AutoRAID
™
Array
Technology
and
Balancing
of the data. The Disk Array Controller
manages all data transfers to and from the host computer and also to
and from each
Disk Module
.
Disk Module
The disk array enclosure holds up to twelve Disk Modules. Each Disk
Module contains a single hard disk assembly.
Disks Not in Use
A Disk Not in Use is any disk that is installed in the array enclosure but
is not included in the array configuration.
Disk Stamp
A unique identifying code written to each disk. The Disk Stamp
identifies the disk as belonging to the set of disks installed in the array.
The stamp is written to the disk when it is included in the array.
Downing A Disk
The process of logically removing a disk from the array configuration.
Typically done before testing a disk, downing a disk has much the same
effect as physically removing it from the array enclosure.
DRR
DRR, or Disable Remote Reset. When DRR is ON or enabled (default),
it prevents a host SCSI reset from resetting both disk array SCSI buses.
With DRR set to ON, disk array controllers are not allowed to reset
their own SCSI bus, even if the host resets that controller. If DRR is set
to OFF, a host SCSI reset will also allow that controller to reset both
disk array SCSI buses.
Dynamic Data Migration
Dynamic Data Migration is the process of moving data that is accessed
frequently (according to both the
Disk Stamp
and the
Time Stamp,
which is updated when the data is written) into
RAID 0/1
space, which
is optimized for performance, and also moving data that is accessed
less often into
RAID 5
space, which is optimized for its higher storage
density.