Nortel Networks 400 4.0 用户手册
Chapter 19 System monitoring and troubleshooting
221
BCM200/400 4.0 Installation and Maintenance Guide
RAID disk mirroring
The RAID configuration (RAID 1) uses two hard disks. One disk is called the primary master hard
disk and the other is called the mirror master hard disk. Disk mirroring is the process of ensuring
the data from one hard disk is identical to the other.
disk and the other is called the mirror master hard disk. Disk mirroring is the process of ensuring
the data from one hard disk is identical to the other.
Disk mirroring provides data redundancy and fault tolerance should one disk fail. The mirror hard
disk continues to function and the system operates without any loss of service if the primary
master hard disk fails. Similarly, the primary master hard disk continues to function and the system
operates without any loss of service if the mirror hard disk fails.
disk continues to function and the system operates without any loss of service if the primary
master hard disk fails. Similarly, the primary master hard disk continues to function and the system
operates without any loss of service if the mirror hard disk fails.
Over time, configuration or load data on your system changes. The system writes the new data to
both disks simultaneously.
both disks simultaneously.
The RAID configuration disk replacement scenarios are as follows:
Flashing green
Drives may not be identical.
Indicates a data comparison fault. For 3.5x
version software (and later), the system
automatically adapts for data mismatches
and unequal hard disk capacity. The system
attempts a disk mirror rebuild.
version software (and later), the system
automatically adapts for data mismatches
and unequal hard disk capacity. The system
attempts a disk mirror rebuild.
The system continues to operate. Nortel
recommends that you perform the following:
recommends that you perform the following:
•
Examine the status report to determine
which hard disk has the smaller
capacity.
which hard disk has the smaller
capacity.
•
Replace the smaller hard disk (primary
master or mirror master) with a new hard
disk of the correct size. Equipment
provided by Nortel assures correct hard
disk capacity requirements.
master or mirror master) with a new hard
disk of the correct size. Equipment
provided by Nortel assures correct hard
disk capacity requirements.
Solid red
•
Drives are not in mirror mode.
•
Missing or bad hard disk (1 or both).
•
Occurs on newly installed RAID card
or hard disk (first 10 min). SSM
begins mirror process — no action
required.
or hard disk (first 10 min). SSM
begins mirror process — no action
required.
•
SSM determined BCM is not
initialized (core software, WAN,
MSC).
initialized (core software, WAN,
MSC).
Immediate action required:
•
Check the RAID operational status.
•
Check hard disk power and data
connections.
connections.
•
Replace the hard disk if required.
•
Initialize the BCM system.
Note: Under some conditions, the system will halt operating if a hard disk fails during a
read/write to the operating system (O/S) portion of the hard disk. To continue operation,
reboot the system.
read/write to the operating system (O/S) portion of the hard disk. To continue operation,
reboot the system.
Table 79 Status LED description (Sheet 2 of 2)
Status LED
description
description
Description
Maintenance action