Customer-Management Connection; Storage Devices - Sun Microsystems StorEdge 3900 Series Reference Manual

Customer-Management Connection

The customer-management connection is a dedicated Ethernet connection provided
on each Storage Service Processor that connects to the designated master Sun
StorEdge 3900 and 6900 series storage subsystem. The master Storage Service
Processor is used to collect status data from each Sun StorEdge 3900 and 6900 series
machine using the LAN. The master Storage Service Processor then reports the
status data used by the Storage Service Processor that is equipped with Sun
StorEdge Remote Response software.
Customers can alternatively choose to do one or more of the following:
Use their management LAN to support network traffic other than that reported
by the Sun StorEdge Remote Response software.
Provide a private LAN to isolate the service traffic from customer traffic.
Supply a secure router to isolate the customer LAN from the Service Processor
LAN.

Storage Devices

The Sun StorEdge T3+ array, both the 36-Gbyte and 73-Gbyte versions, provides
backend data storage. In factory-configured basic configurations, the Sun StorEdge
T3+ arrays are configured with two LUNs per partner group or one LUN per
physical unit. Each LUN is a full-capacity RAID 5 (8 disks) volume with a segment
size of 16 Kbytes and is configured with a standby hot spare. Additional utilities are
provided on the Storage Service Processor that enable Sun-trained personnel to
reconfigure the Sun StorEdge T3+ array LUNs to meet workload performance
requirements.
The RAID levels supported by the Sun StorEdge T3+ array 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
5-drive RAID 5 volume with 73-Gbyte drives has a capacity of (5—1) x 73 = 292
Gbytes.
Chapter 2 Component Descriptions 15