Multiple Connected Sessions for Windows 2008

Are you using Windows Server 2008’s iSCSI initiator? Do you know what connection policy you have?

If you said “no” to the last question, you may need to check out this TechRepublic article which explains the multiple connected sessions (MCS) policies.

Here are the 5 policies defined:

  • Round robin (default): This policy attempts to evenly distribute storage traffic to all available processing paths.
  • Fail over only: This policy designates one active (primary) path to the storage resource; the remaining paths are assigned to a standby role. If the remaining paths are engaged for active storage, they will attempt to come online with a round robin policy until one is available.
  • Round robin with subset: This policy runs round robin on active paths and has standby paths that are available via round-robin if the active paths fail.
  • Least queue depth: This policy attempts to distribute loads based on I/O requests and the associated queue length. The round robin policy simply processes each request equally, with no regard to the load associated with the I/O task on the path.
  • Weighted paths: This policy designates a path to have a low number (priority) to a path

Share your experience with MCS policies, drop a line.

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