Silicon Graphics Altix ICE 8000 Series, Quick Reference Manual, Page: 27 / 84

Scali Manage TM On SGI
®
Altix
®
ICE System Quick Reference Guide
• Runs the fabric management software to monitor and function the InfiniBand
fabric on one or more leader nodes in your Altix ICE system
• Monitors, functions, and receives data from the IRUs within its rack
• Monitors, functions, and receives data from compute nodes within its rack
• Consolidates and forwards data from the IRUs and compute nodes within its rack
to the admin node upon request
Chassis Management Control (CMC) Blade
Note: The following CMC description is the same as the information presented in
"Basic System Building Blocks" on page 1.
Each IRU has a one chassis management control (CMC) blade located directly below
compute blade slot 0 as shown in Figure 1-1 on page 2. This is the chassis manager
that performs environmental control and monitoring of the IRU. The CMC controls
master power to the compute blades under direction of the rack leader controller
(leader node). The leader node can also query the CMC for monitored environmental
data (temperatures, fan speeds, and so on) for the IRU. Power control for each blade
is handled by the Baseboard Management Controller (BMC) also under direction of
the rack leader controller. Once the leader node has asked the CMC to enable master
power, the leader node can then command each BMC to power up its associated
blade. The leader node can also query each BMC to obtain some environmental and
error log information about each blade.
Compute Node
Figure 1-1 on page 2 shows an IRU with 16 compute nodes. Users submit MPI jobs to
run in parallel on the Altix ICE system compute nodes using a public network
connection via the service node. The service node provides login services and a batch
scheduling service, such as the Scali MPI scheduling service. The compute nodes are
controlled and monitored by the leader node in rack as shown in Figure 1-2 on page
7. A compute node is diskless and its filesystem is in memory. Scali Manage diskless
means a "memory resident" operating system. This means that the operating system
resides solely in the system memory. And this means that with each reboot, the
compute nodes are re-imaged. For Scali Manage Altix ICE systems, there is only
random random-access memory (RAM) available on compute nodes. Power cycle
installs a fresh image and any changes to the compute node "filesystem" are volatile.
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