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disk mirroring
A technique in which data is written to two duplicate disks simultaneously.
Mirroring provides data protection in the case of disk failure, because data is
constantly updated to both disks. This way if one of the hard drives fails, the
system can instantly switch to the other disk without any loss of data or service.
See also
RAID 1-level data storage and failover protection.
disk striping
The process of dividing a body of data into blocks and spreading the data
blocks across several partitions on several disks.
See also
RAID.
disk-to-disk
backup
Typically refers to backing up data on disks rather than on tape. Disk-to-disk
backup systems provide a very fast single
fi
le restore capability compared with
disk-to-tape backup.
See also
data restore and virtual tape.
disk-to-disk-to-
tape backup
Archiving in which data is initially copied to backup storage on a disk-based
storage system, such as a VLS, and then periodically copied again to a tape
storage system.
See also
data migration.
dual port virtual
devices
Virtual devices (for example, the two host or device ports on each FC card in
the node) with connectivity to two ports so that the device can be connected to
more than one input or output.
dynamic disk
fi
lesystem
A
fi
nely-tuned
fi
lesystem developed to handle large block I/O typical of
a streaming backup/restore environment. This
fi
lesystem is optimized for
sequential access and very large
fi
le sizes.
extent
The minimum amount of disk space allocated for writing by the VLS dynamic
disk
fi
lesystem. A smaller extent reduces wasted disk space, but decreases
restore performance. The VLS extent size is 32MB.
See also
data restore.
failover protection
A backup operational mode in which the functions of a system component (such
as a hard drive or power supply) are assumed by secondary system components
when the primary component becomes unavailable through either failure or
scheduled down time.
Fibre Channel (FC)
A technology for transmitting data between computer devices at data rates
of up to 1 or 2 GB/second. FC is especially suited for connecting computer
servers to shared storage devices.
fi
le
A VLS
fi
le is a virtual cartridge.
Firesafe
The holding area for virtual media that is not assigned to a virtual library. Data
cannot be restored from virtual media located in the Firesafe until the media is
moved into a library.
hot plug
The ability to add and remove devices to an appliance while the appliance is
running and have the operating system automatically recognize the change.
infrastructure
The physical hardware used to interconnect computers. Infrastructure also
includes the software used to send, receive, and manage the signals that are
transmitted.
initiator
Media (host) server that runs the backup/restore application that passes
commands and data between the network and the VLS.
inputs/outputs per
second
A measure of performance for a host-attached storage device or RAID controller.
library
A storage device that handles multiple units of media and provides one or
more drives for reading and writing them, such as a physical tape library and
172
Glossary
Содержание StorageWorks 300
Страница 18: ...18 Introduction ...
Страница 50: ...50 Operation ...
Страница 55: ...Figure 25 Security Alert window 2 Click Install Certificate and then click OK HP StorageWorks 55 ...
Страница 60: ...60 User interfaces ...
Страница 86: ...86 Configuration ...
Страница 98: ...98 Management ...
Страница 118: ...1 18 CLI command set ...
Страница 127: ...USB LAN adapter components 11191 1 2 3 Item Description 1 USB LAN adapter 2 LAN cable 3 USB cable HP StorageWorks 127 ...
Страница 128: ...128 Component identification ...
Страница 142: ...142 Component replacement ...
Страница 150: ...150 Troubleshooting ...
Страница 161: ...Latvian notice Lithuanian notice Polish notice HP StorageWorks 161 ...
Страница 170: ...170 Specifications ...
Страница 176: ...176 Glossary ...