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Fibre to SAS/SATA II RAID Subsystem
18
User Manual
contains a Port Bypass Circuit(PBC) to automatically open and close the loop to
support hot pluggability.
Switched Fabric
Switched fabric is the highest performing device available for interconnecting large
number of devices, increasing bandwidth, reducing congestion and providing
aggregate throughput.
Each device is connected to a port on the switch, enabling an on-demand connection
to every connected device. Each node on a Switched fabric uses an aggregate
throughput data path to send or receive data.
1.3.4 LUN Masking
LUN masking is a RAID system-centric enforced method of masking multiple LUNs
behind a single port. By using World Wide Port Names (WWPNs) of server HBAs,
LUN masking is configured at the volume level. LUN masking also allows s h a r i n g
disk storage resource across multiple independent servers. A single large RAID
device can be sub-divided to serve a number of different hosts that are attached to
the RAID through the SAN fabric with LUN masking. So that only one or a limited
number of servers can see that LUN, each LUN inside the RAID device can be limited.
LUN masking can be done either at the RAID device (behind the RAID port) or at the
server HBA. It is more secure to mask LUNs at the RAID device, but not all RAID
devices have LUN masking capability. Therefore, in order to mask LUNs, some HBA
vendors allow persistent binding at the driver-level.
1.4 Array Definition
1.4.1 Raid Set
A Raid Set is a group of disk drives containing one or more logical volumes called
Volume Sets. It is not possible to have multiple Raid Sets on the same disk drives.
A Volume Set must be created either on an existing Raid Set or on a group of available
individual disk drives (disk drives that are not yet a part of a Raid Set). If there are
existing Raid Sets with available raw capacity, new Volume Set can be created. New
Volume Set can also be created on an existing Raid Set without free raw capacity by
expanding the Raid Set using available disk drive(s) which is/are not yet Raid Set
member. If disk drives of different capacity are grouped together in a Raid Set, then
the capacity of the smallest disk will become the effective capacity of all the disks in
the Raid Set.
Summary of Contents for EP-2243D-F4S3
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