Juniper JSA5800, Hardware Manual

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Maintaining the JSA5800 RAID Array
Redundant array of independent disk (RAID) is a method of using multiple disks to store the same data
in different locations to increase fault tolerance and improve performance. A RAID array is used in the
servers for data storage and to replicate data among multiple hard disk drives. There are different RAID
levels designed to increase data reliability and I/O performance.
The key concepts in RAID are:
• Mirroring—Copy data to more than one disk
• Striping—Split data across more than one disk
• Error correction—Redundant data storage to detect and resolve problems
The JSA5800 appliance uses the RAID10 configuration. In RAID10, drives are duplicated for fault
tolerance.
To monitor the JSA5800 RAID array, use the following commands:
• For the RAID status, use /opt/MegaRAID/MegaCli/MegaCli64 -LDinfo -Lall -a 0
• For the driver status, use /opt/MegaRAID/MegaCli/MegaCli64 -PDList -a 0 |more
• For the RAID consistency check, schedule through cron or use /opt/MegaRAID/MegaCli/MegaCli64
-LDCC -Start -Lall -a 0
RELATED DOCUMENTATION
JSA5800 Appliance Physical Specifications | 14
JSA5800 Appliance Front Panel Description | 5
JSA5800 Appliance Back Panel Description | 9
Maintaining JSA5800 Power System
IN THIS SECTION
Maintaining the JSA5800 Power Supply | 43
42