ABOUT EXTERNAL STORAGE CONTROLLERS AND PORTS
4
The storage array can have single or multiple controllers. Each controller
can have multiple ports.
4
One storage controller port is required for each connection to the
gateway system.
4
A SAN-attached storage controller port used for gateway connectivity
cannot be shared by other SAN-attached hosts that access the storage array.
4
Optional redundant connectivity is supported. If you do not use redundant
connectivity, use the external array management interface to disable port
and controller failover.
ABOUT EXTERNAL ARRAY STORAGE
4
External storage disks should be dedicated to the gateway and not shared
with other hosts.
4
Disks should be configured into one or more LUNs and exported to the
gateway.
4
A LUN should be configured using as many disks as possible.
4
All disks in the LUNs must be identical drives and have identical RAID
configurations.
4
The gateway can work with different RAID configurations, but the RAID
configurations that provide the fastest possible 256 KB sequential read
access should be used.
4
A volume on the gateway system must have the same types of LUN but
the size can vary.
ABOUT GATEWAY LUN CONFIGURATION RULES
4
A gateway system supports one volume composed of one to 112 LUNs.
LUN numbers must start at 0 (zero) but need not be contiguous.
4
The maximum LUN number accepted by Data Domain gateway systems
is 255.
4
The minimum data size for each LUN that a gateway system can access
is 400 GiB for initial install, some of which is not usable and reserved for
system use. For subsequent LUNs after the initial install, 100 GiB is the
minimum.
4
Usable capacity will vary based on the storage configuration. The
maximum usable capacity for the gateway system is 143.48 TB, which
requires the Level 3 license.
4
The maximum tested LUN size is 10 TB.
4
To use the maximum amount of space on a system, create multiple LUNs
and adjust the LUN data sizes to comply with the defined rules. The “data
size” means the size of the LUN presented to the Data Domain gateway
system by the third-party external storage.
4
The Data Domain spindle group feature allows LUNs to be mapped to
underlying disks contained in RAID groups. In general, configure a single
spindle group for each RAID group. For best use of this feature, use one
LUN per RAID group. There is a maximum of 16 spindle groups. For more
detail, refer to the
Data Domain Command Reference Guide
(
disk add
dev
command section).
CONNECT EXTERNAL STORAGE
The Data Domain gateway system can be directly attached to the External
Storage Array as in Figure 3, or SAN-attached using the Fibre Channel (FC)
as in Figure 4. A DD880g Gateway system has two dual-port FC Host Bus
Adapters (HBAs). The first HBA card port is located in PCI-e slot 2, and the
second in PCI-e slot 1 on the rear panel. See Figure 1.
Depending on your choice of connectivity, follow the appropriate connectivity
defined in the corresponding figures. For all connectivity, use a fiber optical
cable of appropriate length with an LC connector to connect to one of the FC
HBA card ports on the back of the Data Domain system (see
1
in Figure 3 or
Figure 4). Connect the other end as noted in Figure 3 or Figure 4 (see
2
in
the figures). If the system is SAN-attached, install the additional optical cables
from the FC switch to the appropriate ports on the external storage.
For availability of multipath failover functionality, consult with the
Data
Domain Gateway Compatibility Matrix
on the Data Domain Support web site.
Figure 3: Direct-Attached Configuration
Figure 4: SAN-Attached Configuration
CREATE LUNS
4
On the external storage array, create the LUNs for use by the Data Domain
gateway system. Instructions for creating LUNs are specific to your third-
party storage. See the
Installation Guide
on the Data Domain Support
web site under Integration Documentation.
4
On the external storage array, configure LUN masking so that the Data
Domain gateway system can see only those LUNs that should be available
to the Data Domain gateway system.
SAN ZONE CONFIGURATION
When the storage is SAN attached, create a single initiator zone that includes
one port of the DD880g and the corresponding ports of the storage. Create
separate zones for each path of the DD880g.
For example:
Zone 1
---------
DD880g_p1a
STORAGE_p0
STORAGE_p0_p1
Zone 2
---------
DD880g_p2a
STORAGE_p0_p0
STORAGE_p0_p1
Consult information in the SANs Integration Documentation and
Compatibility Matrices on the Data Domain Support web site.
External Storage Configuration
EMC DATA DOMAIN DD880g INSTALLATION AND SETUP GUIDE | SIDE 1
