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External Storage configuration
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 direct-attached 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.
4 The minimum data size for each LUN that a gateway system can access is
400 GiB for initial install. For subsequent LUNs after the initial install, 100
GiB is the minimum.
AbOuT GATEWAY luN cONFIGurATION rulES
4 A gateway system supports one volume composed of one to 16 LUNs.
LUN numbers must start at 0 (zero) but need not be contiguous.
4 The maximum LUN number accepted by our gateway systems is 255.
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.
cONNEcT EXTErNAl STOrAGE
The Data Domain gateway system can be direct-attached to the External
Storage Array as in Figure 4, or Fibre Channel (FC) SAN-attached as in Figure
5. A DD690g 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 2.
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
Figure 5). Connect the other end as noted in Figure 4 or Figure 5 (see
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 multi-path failover functionality, consult with the Data
Domain Gateway Compatibility Matrix on the Data Domain Support web site.
FIGurE 4: DIrEcT-ATTAcHED cONFIGurATION
FIGurE 5: 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.
FIbrE cHANNEl ZONING cONFIGurATION
When attached to a Fibre Channel SAN, every zone for the DD690g gateway
system and external storage arrays must be created in the SAN.
Consult information in the SANs Integration Documentation and
Compatibility Matrices on the Data Domain Support web site. For array
specific zoning configuration details, consult the appropriate third-party array
vendor documentation.
1
in Figure 4 or
DATA DOMAIN DD690g INSTALLATION AND SETUP GUIDE | SIDE 1
in
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