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10-4
Server Management
Writer: Project: Server Management Comments:
File Name: N-ch10.doc Last Saved On: 4/23/96 11:31 AM
Server Fault Tolerance
Several types of fault tolerance are available with Compaq ProLiant 5000
Servers. The following topics provide details about these types.
Disk Subsystem
Fault Tolerance
You can specify the level of disk subsystem fault tolerance on your Compaq
ProLiant 5000 Server if you are using the Compaq SMART-2 Array
Controller. Your fault tolerance options are as follows:
RAID 0
−
Data striping with no fault tolerance
RAID 1
−
Drive mirroring
RAID 4
−
Data guarding
RAID 5
−
Distributed data guarding
You select the desired RAID level by using the Compaq System
Configuration Utility.
Other Fault Tolerance Features
N+1 Distributed Data Guarding
−−
Stores all parity data on a single
drive. This technique minimizes the cost and capacity required to guard
data (as little as 7 percent of total capacity is required for full
protection).
Online Spare
−
Uses up to four installed spare drives to provide
replacement for a failed drive without intervention. This allows your
server to return quickly to a full fault-tolerant operating condition.
Hot-Pluggable SCSI Drive Support
−
Allows the quick removal of
SCSI drives without powering down the server and without using
screws or cables. This maximizes uptime by allowing your server to
stay on line while you replace hard drives.