
FC-14 and SA-14 Storage Subsystems
System Administration Manual
95
Fibre Channel Statistics
Statistics
are available to monitor the FC activity since Titan was last started or the statistics
were reset. Both per-port and overall statistics are available. The statistics are updated every ten
seconds. In addition, a Fibre Channel histogram which shows the number of bytes/second
received and transmitted over the last few minutes is also available.
FC-14 and SA-14 Storage Subsystems
The FC-14 storage subsystem supports
Tier 1
(15,000 RPM) and
Tier 2
(10,000 RPM) FC disks.
Each storage enclosure can house up to 14 FC disks.
The SA-14 storage subsystem supports
Tier 3
(7,200 RPM) SATA disks. Each storage enclosure
can house up to 14 SATA disks.
The FC-14 and SA-14 storage subsystems consist of the following elements:
•
Storage Controller Enclosure
(SCE). The SCE consists of the FC-14C or SA-14C
storage enclosures and dual RAID controllers. Each RAID controller has dual RAID host
ports, and a single cascade port. The cascade port is used to connect to the
Environmental Services Monitoring (ESM) modules in the storage expansion enclosure
(SEE). A single SCE can support a maximum of seven FC-14Es or SA-14Es.
•
Storage Expansion Enclosure
(SEE). The SEE consists of the FC-14E or SA-14E
storage enclosures fitted with dual ESM modules. Each ESM module has two interfaces
on it that are used to
Loop in
and
Loop Out
of the SEE. Wiring is diversely routed so that
the SCE routes down one path to the first SEE and down the other path to the last SEE.
Note:
Different tiers of storage and drive capacities cannot be mixed behind
a RAID controller.
Storage Characteristics
Both the FC-14 and SA-14 storage enclosures use hardware RAID controllers, but the FC-14
uses Fibre Channel (FC) disk technology while the SA-14 uses SATA disks. The RAID controllers
provide complete RAID functionality and enhanced disk failure management. The number of
controllers in the system depends on its storage capacity.
The FC-14 and SA-14 RAID controllers are integrated as a pair of controllers into a FC-14C or
SA-14C storage enclosure, and each RAID storage controller enclosure supports a maximum of
seven FC-14E or SA-14E expansion enclosures respectively (a maximum of 112 disks). One or
more FC-14E or SA-14E storage enclosures connected to a storage controller enclosure is
referred to as a RAID rack.