Controller
subrack
It is the core component of the OceanStor storage system, and is mainly
responsible for the storage service. A controller subrack consists of the
controller, hard disk, interface card, power entry module (PEM)/fan
module, battery, and dual in-line package (DIP) switch board.
Conversion board
A circuit board in the OceanStor storage system for the conversion of
disks ports.
Cookie
A technology that allows a Web site server to store a bit of data in the
disk or memory of a client or read data from the disk of a client.
Copyback
The process of copying the data from the hot-spare disk back to the
previous disk when the faulty member disk is restored or replaced by a
new one.
Create RAID
group
To organize free disks into a RAID group with a certain RAID level.
Cyclic
redundancy check
CRC consists of a great number of bits computed as the data to be
protected and append to the data.
D
Data disk
The disk for saving service data in RAID groups.
Defragment
The process of rewriting LUN data on disks, which helps to continue
the unoccupied free space among LUNs.
Degraded RAID
group
When member disk in a RAID group fails, part or all of the redundancy
is lost
Delete RAID
group
To delete a RAID group so that member disk in a RAID group becomes
a free disk.
DIP switch board
It is used to adjust the FC cascading rate and FC disk rate, and can mute
the alarm buzzer.
Dirty page
The data that is stored in only the cache but not written into disks.
Disk array
A set of disks from one or more commonly accessible disk subsystem,
combined with a body of control software. The control software presents
the disks' storage capacity to hosts as one or more virtual disks.
Disk location
Locate a hard disk, that is, determine the subrack number and slot
number of the hard disk in the OceanStor storage system.
Disk subrack
It consists of the following parts: expander board, hard disk, PEM/fan
module, and DIP switch board. System capacity can be expanded by
cascading multiple disk subracks.
Disk utilization
The percentage of used capacity in the total available capacity.
Dynamic LUN
During the operations of defragment, expanding the member disk of
RAID group, modifying the stripe unit size and transferring the level of
RAID group dynamically, create a temporary LUN that can help data
transfer.
OceanStor S2600 Storage System
Command Reference
B Glossary
Issue 07 (2010-05-20)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
B-3