Move a LUN from one server to the other Post: 303013288

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Operating Systems Linux Red Hat Move a LUN from one server to the other Post 303013288 by gull04 on Monday 19th of February 2018 07:20:42 AM

02-19-2018

Registered User

Hi,

The NetApp administrator should be able to tell you if there is any I/O on the LUN, if there is I/O you'll have to find out which server already has the disk access. Otherwise if this was a LUN that was setup using LVM - you will have to export it from one server, import it on the other server and then grow the volumes to the required configuration.

But remember;

If the LUN is already mounted on one server, forcing a mount on an other server - will be bad for the disks health and possibly your future job prospects - depending what's on the LUN.

If this is any kind of HA solution, the LUN will be visible in the service groups and it may have to be scanned from inside the service group.

If this is a NEW LUN and is assigned to a server as /dev/sdb, then you should be able to use the standard admin processes to pull the disk in and use it.

Gull04

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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)