Ethernet Hub; Fibre Channel Switches - Sun Microsystems StorEdge 3900 Series Reference And Service Manual

The following features are available on a Sun StorEdge 3900 series system once the
volume slicing feature has been enabled:
LUN/Volume slicing—This enables you to create up to 16 virtual drives from
physical LUNs on a Sun StorEdge T3+ array partner group.
LUN masking—This restricts host HBA access to the virtual LUNs (VLUNs).
The RAID levels supported by the Sun StorEdge T3+ arrays in the Sun StorEdge
3900 and 6900 series configurations are:
RAID 1—Each data block in a RAID 1 volume is mirrored on two physical drives.
If one of the mirrored pair fails, the data from the other drive is used. Because the
data is mirrored in a RAID 1 configuration, the volume has only half the capacity
of the assigned drives. For example, if you create a 4-drive RAID 1 volume with
36-Gbyte drives, the resulting data capacity is 4 x 36 / 2 = 72 Gbytes.
RAID 5—In a RAID 5 configuration, data is striped across the drives in the
volumes in segments, with parity information being striped across the drives, as
well. Because of this parity, if a single drive fails, data can be recovered from the
remaining drives. Two drive failures cause all data to be lost. A RAID 5 volume
has the data capacity of all the drives in the logical unit, less one. For example, a
five-drive RAID 5 volume with 73-Gbyte drives has a capacity of (5 - 1) x 73 = 292
Gbytes.
2.1.5

Ethernet Hub

The Sun StorEdge 3900 and 6900 series uses an Ethernet hub as the backbone for the
internal service network. The allocation of Ethernet ports is as follows:
One Storage Service Processor (per subsystem)
One for each FC switch
One for each virtualization engine
Two for each Sun StorEdge T3+ array partner group
One for the Ethernet hub that is installed in the second Sun StorEdge Expansion
Cabinet in the Sun StorEdge 3960, 3900SL, 6960, and 6960SL systems
2.1.6

Fibre Channel Switches

The Sun StorEdge network FC switch-8 or switch-16 switch provides cable
consolidation and increased connectivity. The Sun StorEdge network FC switch-8
and switch-16 switches are used for the internal data interconnection infrastructure.
2-4 Sun StorEdge 3900 and 6900 Series 1.1 Reference and Service Manual • July 2002