Ghost luns" shown with Hitachi Lightning (SAN)

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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

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