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Maintaining the JSA3800 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 JSA3800 appliance ships with hot-swappable hard disks to offer component redundancy. The JSA3800 appliance uses the RAID10 configuration. In RAID10, drives are duplicated for fault tolerance.



To monitor the JSA3800 RAID array, use the following commands:

  • For the volume status, use sas2ircu 0 status

    For example, [root@localhost ~]# sas2ircu Ø status

  • For the device status, use sas2ircu 0 display

    Note

    You can use this command if the volume state is degraded.

  • For the RAID consistency check, use sas2ircu 0 constchk <id>.

    where <id> is the Volume ID displayed in the Status output.

    Note

    Run a consistency check on the JSA3800 appliance at least once a month to ensure that the defects are mapped out in case of a drive failure.