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targetscsiiscsi
Casteurr
Casteurr

Reputation: 956

ISCSI multiple connections using the same initiator IQN

Is it possible for multiple computers to connect to the same target at the same time, using the same initiator IQN?

Thank you.

Upvotes: 1

Views: 2972

Answers (2)

Mike Andrews
Mike Andrews

Reputation: 3206

It's not a good idea. From RFC 3720 (http://www.ietf.org/rfc/rfc3720.txt):

  a) iSCSI names are globally unique.  No two initiators or targets
     can have the same name.

You may find that duplicate IQN's may work on a given target. But even then, you must ensure that the iSCSI session ID's can not overlap, or the target may get very confused. The combination of IQN, iSCSI session ID and target form the I_T nexus that the target will use to keep track of things. Again, from RFC 3720:

  c)  I_T nexus - a relationship between a SCSI Initiator Port and a
      SCSI Target Port, according to [SAM2].  For iSCSI, this
      relationship is a session, defined as a relationship between
      an iSCSI Initiator's end of the session (SCSI Initiator Port)
      and the iSCSI Target's Portal Group.  The I_T nexus can be
      identified by the conjunction of the SCSI port names or by the
      iSCSI session identifier SSID.  iSCSI defines the I_T nexus
      identifier to be the tuple (iSCSI Initiator Name + 'i' + ISID,
      iSCSI Target Name + 't' + Portal Group Tag).

This nexus object must be unique.

Upvotes: 2

Edward Tomasz Napierala
Edward Tomasz Napierala

Reputation: 1836

Possible - yes. Good idea - no. For this to work correctly you would need a cluster filesystem; otherwise you'll end up with corrupted data.

Upvotes: 0

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