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Attention:
1. After you remove a EV-DDM CRU, wait 70 seconds before replacing or
2. Never hot-swap a EV-DDM CRU when its associated green Activity LED is
Note: If the hard disk drive you want to remove is not in a failed or bypass state,
Controllers
The DS4200 Express has two hot-swappable and redundant RAID controllers. The
controllers are located at the back of the storage subsystem. The left controller is
labeled controller A, and the right controller is labeled controller B. One controller
will continue to operate if the other controller fails.
The controllers contain the storage subsystem RAID control logic, interface ports,
and LEDs. The controller has two fibre channel host ports that you could use to
connect the storage subsystem to the host server. In addition, each controller has
two fibre channel drive ports for connecting to the DS4000 storage expansion
enclosures and two Ethernet ports for DS4200 Express subsystem management
purposes. See Figure 2 on page 9.
Currently, the only supported storage expansion enclosure that attaches to the
DS4200 Express Storage Subsystem is the EXP420. Contact your IBM reseller or
representatives for other supported storage expansion enclosures in the future. You
can also check the interoperability matrix at the following Web site:
www.ibm.com/servers/storage/disk/ds4000/interop-matrix.html
Note: DS4200 Express models 7VH and 7VA have a Submodel ID of 51. The
Although both controllers (A and B) are identical, they are seated in the DS4200
Express chassis in opposite orientations. See Figure 2 on page 9. If the controller
cannot fully be inserted in the controller bay, flip it 180 degrees and reinsert it. Do
not force fit because it may cause damage to the controller unit midplane connector.
Connectors, switch, and enclosure ID
The controllers support fiber optic interfaces for both the host channel and drive
channel ports. The controllers also contain two Ethernet ports for storage
subsystem management purposes and a serial port that IBM Support uses to
perform problem recovery and troubleshooting procedures.
The default IP addresses for the Ethernet ports on controller A are 192.168.128.101
and 192.168.129.101. The default IP addresses for the Ethernet ports on controller
B are 192.168.128.102 and 192.168.129.102. The subnet mask for all cases are
255.255.255.0.
8
IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
reseating it to allow the drive to properly spin down. Failure to do so may cause
undesired events.
flashing. Hot-swap a drive CRU only when its associated amber Fault LED
lights is not flashing or when the drive is inactive and its associated green
Activity LED lights is not flashing.
always use the Storage Manager client program either to place the drive in a
failed state or to place the array that is associated with the drive (or drives)
in an offline state before you remove the drive from the enclosure.
DS4700 Storage Subsystem Workstation model has a Submodel ID of 19.
See "Finding controller, storage expansion enclosure, and drive information"
on page 86 for details on how to locate a storage subsystem's Submodel ID
and other controller information.
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