External LUN
The LUN that is located in other arrays, except the array of the LUN
copy.
F
F_Port
A port of the fibre channel on the optical network. Each F_Port of the
fibre channel on the optical network connects to the N_Port of a certain
node. F_Port is a kind of data frame route port. This kind of port is
transparent for its upper-layer protocol.
Failback
The recovery process of transferring the load of the faulty component
to the backup components.
Failed RAID
group
The number of failed member disks in a RAID group exceeds the
maximum number, which causes data loss.
Failover
The system component with peer functions replaces a faulty component.
For example, if a controller fails, the failover process is started, that is,
another normal controller takes over the I/O load of the faulty controller.
Failure tolerance
The storage system can provide storage resources normally (system
performance may be compromised) when its one or multiple
components fail.
Fast Resync
Fast resync is used to perform quick and efficient resynchronization for
stale mirrors, and recovery the mirrors to be available.
FCL
(File Change Log), The log is used to record the changes of file and
directory in file system.
Fileset
A collection of files within a file system.
Fibre channel
arbitrated loop
A form of Fibre Channel network in which up to 126 nodes are
connected in a loop topology. Nodes connected to Fibre Channel
Arbitrated Loop arbitrates for the single transmission that can occur in
the loop at any instant.
Field replaceable
unit (FRU)
A module or component that will typically be replaced in its entirety as
part of a field service repair operation. Any entity that can be replaced
by a user in the field. Examples of this type of FRU might include:
backplane (the sShelf housing, for all practical purposes), PEM/fan
module, optical module, and battery module. (Not all FRUs supports
hot swapping.)
Firmware
The program that is embedded in programmable non-volatile memory.
Fragment
The free physical space that has not been divided among different LUNs
on a disk.
Free disk
A hard disk that is available in the OceanStor storage system.
Free hot-spare
disk
A hot-spare disk that is available.
OceanStor N8500 Clustered NAS Storage System
Installation Guide (for T Series V100R005)
C Glossary
Issue 02 (2015-09-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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