Chapter 3. Cabling 37
Draft Document for Review August 30, 2007 12:59 am 7065Cabling.fm
If the host servers only have one HBA, it is possible to attach up to six hosts to a dual
controller DS3200 subsystem. However, such configuration are not recommended, as there
is no redundancy for the I/O path or controller. If an HBA, SAS cable or RAID controller fails,
certain hosts will inevitably lose access to logical drives. With two HBAs per host for
redundancy, then three individual servers can be attached to a dual controller DS3200.
SAS switches are coming onto the market, which, when available, will allow connection of a
higher number of host servers.
DS3300 - iSCSI
The DS3300 supports iSCSI SAN, which utilizes the standard Ethernet infrastructure, using
regular Ethernet cables on the host side. The simplest case is a direct connection to a single
host server. It is more typical to attach multiple host servers through an Ethernet switch. See
Figure 3-5 for an example.
Figure 3-5 Four host servers attached to a DS3300 subsystem
DS3400 - Fibre Channel
The DS3400 RAID controller has two FC host ports - you can therefore connect up to two
host servers directly. For a larger number of host servers, you have to use FC SAN
infrastructure.
You need to install an SFP module in each FC host port you intend to use. The SFP modules
convert electrical signals from the FC port into optical signals suitable for transmission over
FC media and vice versa. Plug one end of the FC cable into the SFP module and the other
end into the host server HBA or a SAN switch port.
The SFP modules are keyed in order to prevent incorrect insertion. Do not use force when
inserting them - this could damage the SFP module and the FC port. When inserted correctly,
the locking mechanism will lock the module in place.
DS3300
Ethernet switch
Host server 1
Host server 2
Host
server 3
Host
server 4
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