HP LH4r HP NetRAID 1M/2M Installation & Configuration - Page 172

Channel, Format, Hot Spare, Hot-Swap Disk Module, Initialization

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Glossary • Under Windows NT or NetWare 4.2, enable virtual sizing to prepare for online capacity expansion. The controller creates virtual space when the "virtual sizing" option is enabled in the HP NetRAID Express Tools utility. A volume can then be expanded into the virtual space by adding a physical disk through reconstruction. Reconstruction is only permitted on a logical drive that occupies a single array and is the only logical drive in the array. You cannot use online capacity expansion on logical drives that span arrays (RAID levels 10 or 50). Channel: An electrical path for the transfer of data and control information between a disk and a disk adapter. Format: The process of writing zeros to all data fields in a physical drive (hard drive) and to map out unreadable or bad sectors. Because most hard drives are factory formatted, formatting is usually only done if a hard disk generates several media errors. GB: A gigabyte; an abbreviation for 1,073,741,824 (2 to the 30th power) bytes used for memory or disk capacities. Hot Spare: An idle, powered-on, stand-by disk module ready for use should another disk module fail. It does not contain any user data. Up to eight disk modules can be assigned as hot spares for an adapter. A hot spare can be dedicated to a single redundant array, or it can be part of the global hot-spare pool for all the arrays controlled by the adapter. Only one hot spare can be dedicated to a given array. When a disk fails, the adapter's firmware automatically replaces and rebuilds the data from the failed disk onto the hot-spare disk. Data can only be rebuilt from logical drives with redundancy (RAID levels 1, 5, 10, or 50; not RAID 0), and the hot-spare disk must have sufficient capacity. The system administrator can replace the failed disk module and designate the replacement disk module as a new hot spare. Hot-Swap Disk Module: Hot swap modules allow a system administrator to replace a failed disk drive in a server without powering down the server and suspending network services. The hot swap module simply pulls out from its slot in the drive cage because all power and cable connections are integrated into the server backplane. Then the replacement hot-swap module can slide into the slot. Hot swapping only works for RAID 1, 5, 10, and 50 configurations. Initialization: The process of writing zeros to the data fields of a logical drive and generating corresponding parity to put the logical drive in a Ready state. Initializing erases previous data, generating parity so that the logical drive will 164

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Glossary
164
•
Under Windows NT or NetWare 4.2, enable virtual sizing to prepare for
online capacity expansion. The controller creates virtual space when the
"virtual sizing" option is enabled in the HP NetRAID Express Tools
utility. A volume can then be expanded into the virtual space by adding a
physical disk through reconstruction.
Reconstruction is only permitted on a logical drive that occupies a single array
and is the only logical drive in the array. You cannot use online capacity
expansion on logical drives that span arrays (RAID levels 10 or 50).
Channel
: An electrical path for the transfer of data and control information
between a disk and a disk adapter.
Format
: The process of writing zeros to all data fields in a physical drive (hard
drive) and to map out unreadable or bad sectors. Because most hard drives are
factory formatted, formatting is usually only done if a hard disk generates several
media errors.
GB
: A gigabyte; an abbreviation for 1,073,741,824 (2 to the 30th power) bytes
used for memory or disk capacities.
Hot Spare
: An idle, powered-on, stand-by disk module ready for use should
another disk module fail. It does not contain any user data. Up to eight disk
modules can be assigned as hot spares for an adapter. A hot spare can be
dedicated to a single redundant array, or it can be part of the global hot-spare
pool for all the arrays controlled by the adapter. Only one hot spare can be
dedicated to a given array.
When a disk fails, the adapter’s firmware automatically replaces and rebuilds the
data from the failed disk onto the hot-spare disk. Data can only be rebuilt from
logical drives with redundancy (RAID levels 1, 5, 10, or 50; not RAID 0), and
the hot-spare disk must have sufficient capacity. The system administrator can
replace the failed disk module and designate the replacement disk module as a
new hot spare.
Hot-Swap Disk Module
: Hot swap modules allow a system administrator to
replace a failed disk drive in a server without powering down the server and
suspending network services. The hot swap module simply pulls out from its slot
in the drive cage because all power and cable connections are integrated into the
server backplane. Then the replacement hot-swap module can slide into the slot.
Hot swapping only works for RAID 1, 5, 10, and 50 configurations.
Initialization:
The process of writing zeros to the data fields of a logical drive
and generating corresponding parity to put the logical drive in a Ready state.
Initializing erases previous data, generating parity so that the logical drive will