INTRODUCTION
25
replacement is necessary.
1.6.2 RECOVERY ROM
The RAID subsystem rmware is stored on the controller ash
ROM and is executed by the I/O processor. The rmware can also
be updated through the PCI-X/PCIe bus port or Ethernet port (if
equipped) without the need to replace any hardware chips. Dur-
ing the controller rmware upgrade ash process, it is possible for
a problem to occur resulting in corruption of the controller rm-
ware. With our Redundant Flash image feature, the controller will
revert back to the last known version of rmware and continue
operating. This reduces the risk of system failure due to rmware
crash.
1.7 Understanding RAID
RAID is an acronym for Redundant Array of Independent Disks. It
is an array of multiple independent hard disk drives that provides
high performance and fault tolerance. The SATA RAID control-
ler implements several levels of the Berkeley RAID technology.
An appropriate RAID level is selected when the volume sets are
dened or created. This decision should be based on the desired
disk capacity, data availability (fault tolerance or redundancy),
and disk performance. The following section discusses the RAID
levels supported by the SATA RAID controller.
The SATA RAID controller makes the RAID implementation and
the disks’ physical conguration transparent to the host operat-
ing stem. This means that the host operating system drivers and
software utilities are not affected, regardless of the RAID level
selected. Correct installation of the disk array and the control-
ler requires a proper understanding of RAID technology and the
concepts.
1.7.1 RAID 0
RAID 0, also referred to as striping, writes stripes of data across
multiple disk drives instead of just one disk drive. RAID 0 does
not provide any data redundancy, but does offer the best high-
To Next Page
Loading...
