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Maintaining the JSA7800 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 JSA7800 appliance uses the RAID6 configuration. In RAID6, drives are duplicated for fault tolerance.

To monitor the JSA7800 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