Compaq 295242-B21 - RAID Controller - UW SCSI 40 MBps Configurations page 8

SAN Configurations for RA8000/ESA12000 on Windows NT - Intel
Each active controller host port presents one SCSI Target ID with up to eight LUNs to each
server (FC HBA) that has a connected path through the Fabric to the port.
The maximum number of LUNs per HSG80 controller pair is 128
Dual redundant controllers can be configured for Transparent Failover Mode or Multiple-Bus
Failover Mode. Multiple-bus Failover mode requires Compaq Secure Path for Windows NT on
the server
Each storage system can be configured using SWCC or the Command Line Interface (CLI)
through either the HSG80 controller maintenance serial port or a TCP/IP interface
All configurations utilize ACS V8.5F (Array Controller Software) configured for FABRIC
topology
ACS V8.5 provides for up to 64 connection name entries. For dual controllers in Transparent
Failover Mode, up to 2 connection entries are created for each server HBA, thus a total of 32
server HBAs are visible to a storage system at any given time. In Multiple-Bus Failover Mode, up
to 4 connection entries are created for each server HBA, so a total of 16 server HBAs are visible.
Note: The maximum number of server HBAs supported on a storage system is 16. Each storage
system in the SAN will automatically add connection name entries upon initial power up. As a
result, in certain SAN configurations it is possible to exceed the number of available connection
name entries in a storage system prior to the addition of entries for the specific server HBAs that
you want access to. This could result in the inability of a storage system to properly connect to a
desired server HBA in the SAN. To avoid this, you can configure specific server HBAs and
specific storage systems into FC Switch Zones of up to 32 Servers when in Transparent Failover
and up to 16 Servers when in Multiple-bus Failover.
Rename connection names. By default new connection names are automatically added to the
controller connection name table by the controllers when they detect a path to an adapter from
each active controller host port. The default connection name assigned by the controllers will be
"!NEWCONnn", where nn is a number from 1 to 64. After the controllers detect all paths,
rename each connection name to be more meaningful to the configuration i.e., SERVER1P1,
SERVER1P2, etc. (connection names can be a maximum of 9 characters).
Selective Storage Presentation - for configurations with more than 1 FC HBA in a server or more
than one server accessing through the same HSG80 controller host port,
Use the Connection Name Unit Offset value to set the range of unit numbers to be visible
from each server or HBA (using the CLI, "SET connection-name UNIT_OFFSET = n")
Use the Unit Connection Name parameter to allow exclusive access to units from each server
or HBA (using the CLI, "SET unit-number DISABLE_ACCESS_PATH = ALL
ENABLE_ACCESS_PATH = connection-name")
Shared access between different servers to the same
storage unit (LUN) requires specific application software
(i.e., MSCS) to ensure proper data preservation.
LUNs (logical units) can consist of single disks (JBOD), a storageset of multiple disks or a
partition (up to 8), configured for a specific RAID level of 0, 1, 0 + 1, or 3/5
The maximum storage capacity stated (2.6 TB) assumes 36GB disks, increases in disk drive
capacity will increase overall storage capacity for the same enclosure footprint
Enterprise Backup Solution Integration Rules
Supports Legato NetWorker backup for up to 7 Windows NT or Tru64 UNIX Servers
Supports all Compaq FC 16-port and 8-port switch models inter-mixed
Connected to the SAN using FC switch Fabric topology connection
Up to 10 km between FC switch and a tape controller using long-wavelength laser GBICs and 9u
single-mode fiber optic cable
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