• MAC address (used for LAN connectivity)
• WorldWide Names (used for SAN connectivity)
• Boot settings
Statelesscomputing creates a dynamic server environment with highly flexible servers. Every physical server
ina Cisco UCS domain remains anonymous until you associate a service profile with it, then the server gets
theidentity configured in the service profile. If you no longer need a business service on that server, you can
shutit down,disassociate the service profile, and then associateanother service profile tocreate a different
identityfor the same physical server. The "new" server can then host another business service.
Totake full advantage of the flexibility of statelessness, the optional local disks on the servers should only
beused for swap or tempspace and not to store operating system or application data.
Youcan choose to fully implement stateless computing for all physical servers in a Cisco UCS domain, to
nothave any statelessservers, or to have a mix of thetwo types.
If You Opt In to Stateless Computing
Eachphysical server in the Cisco UCS domain is defined through a service profile. Any server can be used
tohost one set of applications, then reassigned to another set of applications or business services, if required
bythe needs of the datacenter.
Youcreate service profiles that point to policies and pools of resources that are defined in the Cisco UCS
domain.The server pools, WWN pools, and MAC pools ensure that all unassigned resources are available
onan as-needed basis. For example, if a physical server fails, you can immediately assign the service profile
toanother server. Because the service profile provides the new server with the same identity as the original
server,including WWN and MAC address, the rest of the data center infrastructure sees it as the same server
andyou do not need to makeany configuration changes in the LAN or SAN.
If You Opt Out of Stateless Computing
Eachserver inthe CiscoUCS domainis treated asa traditionalrack mount server.
Youcreate service profiles that inherit the identify information burned into the hardware and use these profiles
toconfigure LAN or SAN connectivity for the server. However, if the server hardware fails, you cannot
reassignthe service profile toa newserver.
Multi-Tenancy
Multi-tenancyallows you to divide up the large physical infrastructure of an Cisco UCS domain into logical
entitiesknown as organizations. As a result, you can achieve a logical isolation between organizations without
providinga dedicatedphysical infrastructure for eachorganization.
Youcan assign unique resources to each tenant through the related organization, in the multi-tenant
environment.These resources can includedifferent policies, pools, and quality of service definitions. You
canalso implement locales to assign or restrict user privileges and roles by organization, if you do not want
allusers to haveaccess to all organizations.
Ifyou set up a multi-tenant environment, all organizations are hierarchical. The top-level organization is
alwaysroot. The policies and pools that you create in root are system-wide and are available to all organizations
inthe system. However, any policies and pools created in other organizations are only available to organizations
thatare above it in the same hierarchy. For example, if a system has organizations named Finance and HR
thatare not in the same hierarchy, Finance cannot use any policies in the HR organization, and HR cannot
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Opt-In Features