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Operating Systems AIX [ASK] - AIX Fibre Channel behavior Post 303031938 by Phat on Friday 8th of March 2019 02:41:19 AM
Old 03-08-2019
Hi Bakunin,

You are right. I'm not so understand well the FC work, zoning work, and IBM virtualization work.
Just want to know the FC port work and multipath(redundant) work.

We talk about another aspect. For example, if you have 2 FC cards, each has 2 ports. So 4 ports are connected to the LUN. Assuming that, 3 ports failed and we have only 1 port. So we still can see the LUN? and in case 2 ports failed, we can see the LUN? In regard redundant, with 4 line connected to LUN, the system is only down if 4 lines were down/broken, even if 1 line is still available, the system still running. Please correct me this.

I'm surprised is that in my environment I can see the LUN on 2 still-working FC cards, but not boot device. After 1 more FC is up again, I can see. So confused about this.
 

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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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