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RAID Array

The JSA appliance ships with hot-swappable hard disks to offer component redundancy. JSA7500 have RAID10 configuration. You can hot-swap the disk if any one of the disks fails.

Redundant array of independent disk (RAID) is an organization of multiple disks of fault tolerance and performance. A RAID array is used in the servers for data storage and to replicate data among multiple hark 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

JSA7500 uses RAID10. RAID1 uses mirroring and duplex techniques to copy data to the redundant disk. In RAID10, drives are duplicated for fault tolerance.

To monitor the RAID array, use the following commands:

  • For JSA7500, create a symlink. For example, ln –s /opt/MegaRAID/MegaCli/MegaCli64 /bin/MegaCli

    • For drive status: /opt/MegaRAID/MegaCli/MegaCli64 -PDlist -a Ø

    • For RAID10 status: /opt/MegaRAID/MegaCli/MegaCli64 -LDInfo -LAll –a Ø

  • For JSA7500 RAID consistency check, schedule through cron or use /opt/MegaRAID/MegaCli/MegaCli64 -LDCC -Start -Lall -a Ø.