Users Guide
Managing SAS IOMs
The internal connection of the storage subsystem is called "Fabric C", which serves as a communication mode between compute
sleds and storage enclosures. The "Fabric C" is used for SAS of FC storage connectivity and includes a midplane. SAS IOMs
allow creating storage assignments in which you can map storage enclosure drives or whole storage enclosures to compute
sleds. SAS IOMs provide multi-path input out access for compute sleds to drive elements. The active module manages the SAS
IOM and is responsible for all inventory and storage assignments on the fabric.
A single width compute sled can support one Fab-C mezzanine card that connects to each IOM through a x4 link. Each lane in
the link supports 12Gbps SAS for a total of 48Gbps link to each SAS IOM. In SAS IOMs, the Fab-C IOMs are used to provide
SAS switching between compute sleds and internal storage sleds such as PowerEdge MX5016s.
For information on the tasks that you can perform on the I/O Modules page for SAS, see Managing IOMs.
SAS IOM Overview
The SAS IOM Overview page displays details of the IOM, chassis, the list of recent alerts, and recent activities. The IOM
information consists of the model, power state, firmware version, fabric type, and management role of the IOM. The
management roles can be of three types:
● Active
● Passive
● Degraded
A healthy system has one "Active" and one "Passive" SAS IOM.
The chassis information consists of the name of the chassis, slot name, and slot number.
Information about the SAS IOM storage subsystems is also displayed on the right side of the Overview page. The storage
subsystem information consists of the name of the subsystem and health status. Click View Details to view the alerts and alert
details. The details consist of the message ID, message, timestamp when the alert was triggered, and recommended action.
To view the IOM overview:
1. From the menu bar, click Devices > I/O Modules. The I/O Modules list page is displayed.
2. Select the IOM whose details you want to view. A summary of the selected IOM is displayed on the right side. The summary
consists of the name of the IOM, device type, management IP, model, health status, and availability.
3. Click View Details. The Overview page is displayed.
On the IOM Overview page, you can perform the following tasks:
● Power Control—Turn on, turn off, power cycle, or system reseat operations.
○ Turn on or turn off—When you turn off the IOM, the status of the IOM is "Offline". As a result, status of the peer IOM
may be "Active". When you power cycle the IOM, it causes a warm reboot of the IOM.
○ Power Cycle—The Power Cycle option initiates a warm reboot of the IOM. In this instance, the power is not removed
from the IOM and the core systems of the IOM reboot.
○ System Reseat—The System Reseat option initiates a cold reboot of the IOM. In this instance, the power is removed
from the IOM and the IOM reboots.
NOTE:
After the power reseat of the SAS IOM, the IOM turns on within a minute. Any mismatch in the power status
of the IOM is corrected through refreshing the inventory or is corrected automatically with the default inventory
task.
● Blink LED—Turn on or turn off to identify the IOM LEDs.
● Clear Configuration—Delete the storage IOM configuration.
● Extract Log—Extract the IOM activities log to a CIFS or NFS share location.
● View a list of the latest alerts and the date and time when the alerts were generated, in the Recent Alerts section. To view
a list of all alerts click View All. The Alerts page with all alerts that are related to the IOM is displayed.
● View a list of all activities that are related to the IOM, the rate of completion of the activity, and the date of time when the
activity began, in the Recent Activity section. To view a list of all activities that are related to the IOM, click View All. The
Jobs page with a list of all the jobs that are related to the IOM is displayed.
● View the power statistics of the IOM by clicking View Power Statistics in the Environment section. The statistics
comprise peak power timestamp, minimum power timestamp, date, and time from when the statistics is recorded. Click
Reset to reset the power statistics data.
Managing storage
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