The following example shows the steps for adding a third Drive Enclosure to an existing string.
Note: The procedure involves disconnecting and reconnecting SAS cables. It can take several minutes for the Oracle FS System to stabilize after disconnecting and reconnecting SAS cables, especially when I/O is running.
In this example, the string connects to SAS HBA port 0 on the Controller nodes. Depending on the string number and the configuration of the Controllers in your system, the string connects to SAS HBA port 0 or SAS HBA port 1 on the Controller nodes.
- Using a mini-SAS to mini-SAS cable, connect one end of the cable to I/O module 0, port 1 on Drive Enclosure 2 (DE 2). Note: If the system remained in production, continually be aware of the state of the system when adding Drive Enclosures. The configuration of the system has dual paths for all of the required connections within the system. During parts of the procedures for adding a Drive Enclosure, one of those paths might be disabled. An error such as disconnecting the wrong cable can cause serious problems to ongoing operation of the system.
- Connect the other end of the cable to I/O module 0, port 0 on Drive Enclosure 3 (DE 3).
Figure 1: First connection between DE 2 and DE 3 in a string
- Legend
1 I/O module 1, port 1 on DE 2 2 I/O module 0, port 0 on DE 3
- Disconnect the mini-SAS cable from I/O module 1, port 0 on DE 2, and connect the cable to I/O module 1, port 0 on DE 3.
Figure 2: Connection from SAS HBA to DE 3
- Legend
1 I/O module 1, port 0 on DE 2 2 I/O module 1, port 0 on DE 3
- Using a mini-SAS to mini-SAS cable, connect one end of the cable to I/O module 1, port 0 on DE 2.
- Connect the other end of the cable to I/O module 1, port 1 on DE 3.
Figure 3: Final connection for third Drive Enclosure in string
- Legend
1 I/O module 1, port 0 on DE 2 2 I/O module 1, port 1 on DE 3
- From a command line, issue fscli topology —list —violations.If there are topology violations, correct them prior to proceeding.
- Ensure that the cables do not obstruct access to the replaceable units in the Drive Enclosure and the Controllers.