Storage Library MIB

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Storage Library MIB

• Jeff Bain, HP
• Andrea Westerinen, SNIA

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Topics

• Storage Media Libraries
• How is the MIB designed?
• What is CIM and how is it mapped into SNMP?
• Contents of the MIB
• Advantages of this approach

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What are Storage Libraries?

• Also called Autochangers, Libraries,
  Autoloaders, Jukeboxes
• An encloser containing
• Slots or magazines for holding media, and drives
  (DLT tape, Magneto-optical, DAT, etc.) for
  playing media
• Pickers/changers to grab and transport media, and
  ports to import/export media
• Power supplies, fans, displays, keypads, etc.
• LAN connectivity and agents to handle SNMP
  requests
• Generally connected to one or more SCSI buses,
  or fibre channel Storage Area Networks (SANs)

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Library Management Today

• Currently, library vendors define their own
  proprietary MIBs
• Difficult for backup and management applications
  (and end-users) to get a unified view of their
  libraries

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How Is the MIB Designed?

• Objects, properties, and associations to describe
  libraries are defined in CIM v2.2
• Based on input from leading library vendors
• These CIM library objects, properties, etc. are
  mapped into a MIB

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What Is CIM?

• Common Information Model from the Distributed
  Management Task Force (DMTF)
• Object-oriented model defining managed entities
  in the enterprise
• Inheritance and abstraction
• Classes, properties, methods, and associations
• Divided into logical and physical sections
• Includes objects for Storage Media Libraries,
  drives, pickers/changers, label readers, etc.

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CIM to MIB Mapping
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Graphical Example
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Explanation of Example

• Multiple instances described using a table
• Same approach (using a table) employed when
  describing array properties
• Same approach (using a table) employed when
  describing that the object participates in
  multiple copies of an association
• Property named ScalarProperty is included in both
  FooObject and BarObject - Through abbreviations
  in the MIB field names, avoid name duplication

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Objects in CIM and the MIB
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Other CIM Info, In Progress

• SCSI Information
• Power Supply and Fan data
• Fibre Channel information

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CIM and SNMP Cooperation
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Advantages of Approach

• CIM is an industry-standard information model,
  adopted by SNIA and Sun's JIRO/FMA
• Eliminates confusion and abstracts protocols,
  interfaces and vendor-specific implementations
• Can present a complete picture of an enterprise
• Allows vendor differentiation by
  extending/subclassing the standard
• Most library vendors have an SNMP agent
• HTTP/XML support is also defined