Silicon Graphics ICE X, User Manual

Page: 65 / 142

System Features and Major Components
007-5806-004 45
OSS Node
The object storage server (OSS node) is one of the elements of a Lustre File Storage system. The
OSS is managed by the SGI ICE X management network. The OSS stores file data on one or more
object storage targets (OSTs). Depending on the server’s hardware, an OSS node typically serves
between two and eight OSTs, with each OST managing a single local disk filesystem.
An OST is a dedicated filesystem that exports an interface to byte ranges of objects for read/write
operations. The capacity of each OST on the OSS node can range from a maximum of 24 to 128
TB depending on the SGI ICE X operating system and the Lustre release level. The data storage
capacity of a Lustre file system is the available storage total of the capacities provided by the
OSTs.
Reliability, Availability, and Serviceability (RAS)
The SGI ICE X server series components have the following features to increase the reliability,
availability, and serviceability (RAS) of the systems.
• Power and cooling:
– Power supplies within the blade enclosure pair chassis are redundant and can be
hot-swapped under most circumstances.
– A rack-level water chilled cooling option is available for all D-rack configurations.
– Blade enclosures have overcurrent protection at the blade and power supply level.
– Fans (blowers) are redundant in D-rack configurations and can be hot-swapped.
– Fans can run at multiple speeds. Speed increases automatically when temperature
increases or when a single fan fails.
• System monitoring:
– Chassis managers monitor blade enclosure internal voltage, power and temperature.
– Redundant system management networking is available.
– Each blade/node installed has status LEDs that can indicate a malfunctioning or failed
part; LEDs are readable at the front of the system.
– Systems support remote console and maintenance activities.