HP P3410A HP NetRAID 1M/2M Installation & Configuration - Page 173

The IOP I/O Processor for the integrated HP NetRAID controller directs

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Glossary pass a Consistency Check. Arrays work without initializing, but they may fail a Consistency Check because parity fields may not have been generated. IOP: The IOP (I/O Processor) for the integrated HP NetRAID controller directs all functions of the controller, including command processing, PCI and SCSI bus transfers, RAID processing, drive rebuilding, cache management, and error recovery. Logical Drive: A virtual drive within an array, which may consist of more than one physical disk. Logical drives divide up the contiguous storage space of an array of disk modules or a spanned group of arrays of disks. The storage space in a logical drive is spread across all the disks in the array or spanned arrays. Each HP NetRAID-1M and 2M adapter can be configured with up to 40 logical drives in any combination of sizes. Configure at least one logical drive for each array. A logical drive can be in one of five states (also see the SCSI Disk Status below): • Online: all participating disk modules are online. • Degraded: (Critical) a single disk module in a redundant array (not RAID 0) is not online. Data loss may result if a second disk module fails. • Offline: two or more disk modules in a redundant array (not RAID 0), or one or more disk modules in a RAID 0 array are not online. • Reconstructing: participating disk modules are being reconstructed. • Rebuilding: participating disk modules are being rebuilt. I/O operations can only be performed with logical drives that are online or degraded (critical). Logical Volume: A virtual disk made up of logical disks rather than physical ones. Also called a partition. LVD SCSI: Low Voltage Differential SCSI. MB: A megabyte; an abbreviation for 1,048,576 (2 to the 20th power) bytes; used for memory or disk capacities. Mirroring: The style of redundancy in which the data on one disk completely duplicates the data on another disk. RAID levels 1 and 10 use mirroring. Parity: Parity is an extra bit added to a byte or word to reveal errors in storage (in RAM or disk) or transmission. It is used to generate a set of redundancy data 165

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Glossary
165
pass a Consistency Check. Arrays work without initializing, but they may fail a
Consistency Check because parity fields may not have been generated.
IOP:
The IOP (I/O Processor) for the integrated HP NetRAID controller directs
all functions of the controller, including command processing, PCI and SCSI bus
transfers, RAID processing, drive rebuilding, cache management, and error
recovery.
Logical Drive
: A virtual drive within an array, which may consist of more than
one physical disk.
Logical drives divide up the contiguous storage space of an array of disk modules
or a spanned group of arrays of disks. The storage space in a logical drive is
spread across all the disks in the array or spanned arrays. Each HP NetRAID-1M
and 2M adapter can be configured with up to 40 logical drives in any
combination of sizes. Configure at least one logical drive for each array.
A logical drive can be in one of five states (also see the SCSI Disk Status below):
•
Online
: all participating disk modules are online.
•
Degraded:
(Critical) a single disk module in a redundant array (not
RAID 0) is not online. Data loss may result if a second disk module fails.
•
Offline
: two or more disk modules in a redundant array (not RAID 0), or
one or more disk modules in a RAID 0 array are not online.
•
Reconstructing
: participating disk modules are being reconstructed.
•
Rebuilding
: participating disk modules are being rebuilt.
I/O operations can only be performed with logical drives that are online or
degraded (critical).
Logical Volume
: A virtual disk made up of logical disks rather than physical
ones. Also called a partition.
LVD SCSI
: Low Voltage Differential SCSI.
MB
: A megabyte; an abbreviation for 1,048,576 (2 to the 20th power) bytes; used
for memory or disk capacities.
Mirroring
: The style of redundancy in which the data on one disk completely
duplicates the data on another disk. RAID levels 1 and 10 use mirroring.
Parity
:
Parity is an extra bit added to a byte or word to reveal errors in storage
(in RAM or disk) or transmission. It is used to generate a set of redundancy data