StorageTek SL150 Modular Tape Library
 

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In this Document

Goal

Solution

References

Created from <SR 3-12235782911>

Applies to:

Goal

Persistent binding is not working.
Below is the log showing, that the scsidev was changed from scsidev@2.0.1 to scsidev@2.2.1 after rebooting the host.
OS: Oracle Linux 6.7

[root@vmx3 ~]#
[root@vmx3 ~]# inquire | grep SL150
77662:inquire: CDI warning: Using old-style passthrough via st driver
77662:inquire: CDI warning: Using old-style passthrough via st driver
scsidev@2.0.1:STK SL150 0250|Autochanger (Jukebox), /dev/sg11
  ATNN=STK SL150 464970G+1545SY4834
[root@vmx3 ~]#

--------------reboot---------

[root@vmx3 ~]#
[root@vmx3 ~]# inquire | grep SL150
77662:inquire: CDI warning: Using old-style passthrough via st driver
77662:inquire: CDI warning: Using old-style passthrough via st driver
scsidev@2.2.1:STK SL150 0250|Autochanger (Jukebox), /dev/sg11
  ATNN=STK SL150 464970G+1545SY4834
[root@vmx3 ~]#
 

Solution

The scsidev order is not guaranteed. What we can do is get fixed /dev entries, but we cannot force the scsidevice id - It depends in the order in which the scsi devices are detected and cannot be guessed.

This is where the udev rules come into consideration - Using the udev rules, we will be able to force the /dev entries to fixed values, preventing this issue, as the note suggests - but we cannot force scsidevice identifiers
 

/lib/udev/rules.d

Contains default rules files. Do not edit these files.
/etc/udev/rules.d/*.rules

Contains customized rules files. You can modify these files.
/dev/.udev/rules.d/*.rules

Contains temporary rules files. Do not edit these files

Tape Device Persistent Naming in Oracle Linux 6 (Doc ID 1917234.1)

References

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