What is/are: The Implications of a Loss of Connectivity

Broken Communications

In certain situations it is possible that lines of communication between the NSS Managing Host and the target storage device may be broken. It is important to understand the potential user impact of such a communication break-down.

There is only one action of NSS that is persistent after a loss communications and this is the optional asynchronous locking method of ACL inversion; if a quota is locked by this method prior to the loss of communications then it will remain locked during the interruption. Unlocking is achieved through the use of a command-line tool installed as part of the NSS installation or as per normal NSS operations when service is resumed.

The table below shows the affect a loss of each network interface has:

  LOCKING   MONITORING  
  Asynchronous Synchronous Asynchronous Synchronous
Local Target Locked quotas remain locked during interruption Locked quotas are unlocked during interruption Quota usage level updating paused Quota usage level updating paused
Remote Target Locked quotas remain locked during interruption -- Quota usage level updating paused --
NetApp FAS Locked quotas remain locked during interruption Locked quotas are unlocked during interruption Quota usage level updating paused --
EMC Celerra Locked quotas remain locked during interruption Locked quotas are unlocked during interruption Quota usage level updating paused --

ADDITIONAL RESOURCES

  • KB1729 What is/are: The Interfaces Used in Quota Operations
  • KB Article: 1730

    Updated: 8/22/2014

    • Category
      • Reference
    • Affected versions
      • NSS 9.0
      • NSS 9.5

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