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iscsi.bindings




SYNOPSIS

       /var/lib/iscsi/bindings


DESCRIPTION

       This manual page  describes  the  intent  for  having  the
       iscsi.bindings file and the format of this file.


INTENT

       The  Linux  iSCSI driver creates SCSI device nodes dynami­
       cally whenever a SCSI logical unit is detected.

       The driver does not and cannot ensure that any  particular
       SCSI  device  node (e.g., /dev/sda) will always map to the
       same iSCSI TargetName. This can  result  in  inconsistency
       while  mapping from device nodes (e.g /dev/sda, /dev/rmt8)
       to iSCSI targets and logical units. Symlinks are  provided
       by  iSCSI  driver  for persistent device mapping which are
       used by applications and fstab files.

       Variations in process scheduling  and  network  delay  may
       result  in  iSCSI  targets  being mapped to different SCSI
       device nodes every time the driver is started. Because  of
       this  variability,  configuring  applications or operating
       system utilities to use the standard SCSI device nodes  to
       access  iSCSI  devices  may  result in SCSI commands being
       sent to the wrong target or logical unit.

       To provide persistent binding between the iSCSI device and
       the  physical device, the Linux iSCSI driver will create a
       mapping between SCSI targetId and iSCSI target  names  and
       will store the mapping in the file /var/lib/iscsi/bindings
       This mapping  will  be  used  every  time  the  driver  is
       started.


FORMAT

       The file /var/lib/iscsi/bindings will have the entry that
       binds a TargetId to a iSCSI target WWUI name.


EXAMPLE

       Each line of the file /var/lib/iscsi/bindings will contain
       the following fields:
       bus target targetname

       An example file would look like:
              0  1 iqn.1987-05.com.cisco.00.7e9d6f942e45736be69cb65c4c22e54c.disk0

       The first entry binds target id 1 on bus 1 to iSCSI target
              iqn.1987-05.com.cisco.00.7e9d6f942e45736be69cb65c4c22e54c.disk0.

       edit the file and remove entries so the obselete target no
       longer consumes a SCSI target ID. In the above shown exam­
       ple  if you know that the target which was assigned target
       ID 0 is no longer available then you have to remove line 1
       from /var/lib/iscsi/bindings

       If you know the iSCSI WWUI name of a target in advance and
       you want it to be assigned a particular  SCSI  target  ID,
       you can add an entry manually.

       Note:  You should stop the iSCSI driver before editing the
       these files.

       Warning: Failure to adhere  to  above  instructions  while
       editing can result in unpredictable results.


SEE ALSO

       iscsid(8)

                                                ISCSI.BINDINGS(5)

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