10 Sun StorageTek 2500 Series Array Hardware Installation Guide • March 2007
Sun StorageTek 2501 Array
The drive expansion tray expands the storage capacity of a storage array. The
controllers in the controller tray can connect to the drive expansion tray and access
the disk drives in the drive expansion tray for additional storage. A drive expansion
tray contains both physical components (disk drives, IOMs, and power-fan
assemblies) and logical components (virtual disks and volumes).
Drive Expansion Tray IOM
The drive expansion tray contains two IOMs that provide the interface between the
disk drives in the drive expansion tray and the controllers in the controller tray. The
IOM also monitors sub-system parameters. Each controller in the controller tray
connects to an IOM.
If one IOM fails, the other IOM provides a redundant data path to the disk drives.
You can replace a failed IOM while the power to the storage array is turned on and
the storage array is processing data (a hot swap).
Drive Expansion Tray IOM Connectors
The IOM connects to the controller tray and drive expansion trays with SAS cables.
Each IOM in a drive expansion tray has two SAS expansion connectors. One
connector shows an up arrow, and the other connector shows a down arrow.
FIGURE 1-9 SAS Connectors on the Drive Expansion Tray IOM
When connecting the SAS cable from an IOM in one drive expansion tray to an IOM
in another drive expansion tray, connect from a down arrow to an up arrow. If the
cable is plugged into two connectors with arrows of the same direction,
communication between the two drive expansion trays is lost.
1. SAS Connector (Up
Arrow)
2. SAS Connector
(Down Arrow)
3. Serial Connector
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