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Full Discussion: Reuse a LUN
Homework and Emergencies Emergency UNIX and Linux Support Reuse a LUN Post 302688391 by Peasant on Sunday 19th of August 2012 03:00:09 AM
Old 08-19-2012
You will need to run on server-1 (on which you want to remove the LUN from)

1. vgdisplay -v the group, and write down the LUN's/disks that are used in it.
2. vgexporton that volume group.
3. pvremove on disks that are inside that volume group.
4. Depresent the disks from storage side.
5. Run ioscan -fnC disk, and check for NO_HW
6. Run rmsf -H on NO_HW devices

You have now removed the Lun(s) from server1.

Present the lun's to server 2, run ioscan -fnC disk.
If you are running v2, you will need to run insf -e to create devices, on v3 they will be created after ioscan.
Verify the results with xpinfo, or similar tool.
Run pvcreate on those rdsks created (you don't need -f if you ran pvremove on server1), only per one path is enough of course.
Use the LUN in new or existing volume group.

Notice, if you are running v2 and you are using multipath, you will need to add both paths in your volume group via vgextend (existing) or vgcreate (new).

Hope that helps.
Regards
Peasant.
 

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LEARN ABOUT SUSE

sg_emc_trespass

SG_EMC_TRESPASS(8)						     SG3_UTILS							SG_EMC_TRESPASS(8)

NAME

       sg_emc_trespass - Changes ownership of a LUN from another Service-Processor to this one.

SYNOPSIS

       sg_emc_trespass [-d] [-hr] [-s] [-V] DEVICE

DESCRIPTION

       sg_emc_trespass	sends  an EMC-specific Trespass Command to the DEVICE with the selected options. This Mode Select changes the ownership of
       the LUN of the device from another Service-Processor to the one the command was received on.

OPTIONS

       Arguments to long options are mandatory for short options as well.

       -d     outputs some extra debug information associated with executing this command

       -hr    Sets the 'Honor Reservation' bit in the command. If set, the trespass will only succeed to change the ownership from the Peer SP	if
	      the Peer SP does not have an outstanding SCSI reservation for the LUN. By default, the reservation state will be ignored.

       -s     Send the short version of the trespass command instead of the long version. The short version is supported on the EMC FC5300, FC4500
	      and FC4700. The long version (default) is supported on the CLARiiON CX and AX family arrays.

       -V     print out version string then exit.

       In the 2.4 series of Linux kernels the DEVICE must be a SCSI generic (sg) device. In the 2.6 series block devices (e.g. SCSI disks and  DVD
       drives) can also be specified. For example "sg_start 0 /dev/sda" will work in the 2.6 series kernels.

EXIT STATUS

       The exit status of sg_emc_trespass is 0 when it is successful. Otherwise see the sg3_utils(8) man page.

AUTHOR

       Written by Lars Marowsky-Bree, based on sg_start.

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright (C) 2004 Lars Marowsky-Bree, Douglas Gilbert.
       This  software  is distributed under the GPL version 2. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
       POSE.

sg3_utils-1.23							   January 2007 						SG_EMC_TRESPASS(8)
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