Ghost luns" shown with Hitachi Lightning (SAN)

This document (3820721) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 10

Situation

You have a Hitachi SAN connected to a SLES10 System.
After connecting the cable while the Fibre Channel Controller module is loaded and/or during
boot there are many (max. 16384) "Ghost Devices" per Controller that are not needed or used.

These devices can be found in

/proc/scsi/sg/devices

and

/proc/scsi/sg/device_strs

Notification for discovery can be found in

/var/log/messages

Resolution

the Blacklist entry "HITACHI","OPEN-E", "0x1000240" is the reason for that behavior.

The Flag bit "0x1000000" (PQ3) works different on SLES10 compared to SLES9 and SLES8.

With the use of the kernel-cmdline"scsi_mod.dev_flags=HITACHI:OPEN-E:0x20240"the PQ3 bit for the OPEN-E Devices will be reset und the "ghost luns" are not shown.

So you edit in

/boot/grub/menu.lst

the entry for the kernel commandline and append

scsi_mod.dev_flags=HITACHI:OPEN-E:0x20240

then you reboot and the "ghost luns" are gone
 

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:3820721
  • Creation Date: 06-Feb-2007
  • Modified Date:05-Mar-2021
    • SUSE Linux Enterprise Server

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