IBM Partner Pavilion DS4100 - Manual (Page 34)

connections for expanding the DS4100 storage capacity to SATA hard drives in
external DS4000 EXP100 storage expansion units.
Currently, the only DS4000 storage expansion unit model that can be attached to
the DS4100 base storage server is the DS4000 EXP100. Do not connect other
DS4000 storage expansion units (such as the DS4000 EXP700 or DS4000
EXP710) to the DS4100 base storage server. Please contact your IBM support
representative for information about the availability of future support for connecting
other DS4000 storage expansion unit models.
Note: You must make fibre channel connections from the host server fibre channel
HBA ports to both controllers in the DS4100 base storage server to ensure
full host-side redundancy.
Attention
To ensure proper operation when connecting DS4000 EXP100 expansion units
to the DS4100 base storage server, you must verify that the DS4000 EXP100
ESM firmware level is at level 9554 or later. If the ESM firmware level is lower
than 9554, disconnect the DS4000 EXP100 and contact IBM support, your
IBM reseller, or your IBM representative for assistance.
About the DS4100 single-controller storage server
The DS4100 single-controller storage server (Machine Type 1724, Model 1Sx,
where x represents an upper-case alphanumeric character) is a rack-mountable
storage server that comes with one RAID controller, one power supply, and two
cooling units. It supports up to fourteen hot-swap internal disk drive slots, which
support over 3.5 TB of storage capacity when using 250 GB SATA disk drives.
External cables and small form-factor pluggable (SFP) modules connect the storage
server to the host server fibre channel HBA ports.
Notes:
1. The DS4100 single-controller storage server does not support storage capacity
expansion using external DS4000 EXP100 expansion units (or any other models
of DS4000 storage expansion units). In addition, it does not offer RAID
controller and drive loop redundancy.
2. The cache in the controller of the DS4100 single-controller storage server is
used for read operations only. No write operations will be cached.
The following limitations apply to this release of the DS4100 single-controller
storage server.
v All factory-delivered DS4100 RAID controllers are shipped with a recent version
of controller firmware loaded on the RAID controller, but that firmware version
might not match precisely the firmware version the RAID controller you need to
replace. When you replace the RAID controller in the DS4100 single-controller
storage server, if the firmware version of the replacement RAID controller is
determined to be incompatible with the configuration database during the boot
process, the DS4100 single-controller storage server will enter a Stop State and
will not allow any DS4000 Storage Manager operations to be performed. In this
case, you must manually upgrade or downgrade the replacement RAID controller
firmware to match the version required by the configuration database. See
“Manually upgrading the firmware for the DS4100 single-controller storage
server” on page 103.
2 IBM TotalStorage DS4100 Storage Server: Installation, User’s, and Maintenance Guide