Re: 'Wiring down' hard disks

From	Reco <recoverym4n@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: 'Wiring down' hard disks
Date	2016-09-21 17:20 +0200
Message-ID	<sjRtw-2de-13@gated-at.bofh.it> (permalink)
References	<sjzwD-7F4-91@gated-at.bofh.it> <sjzwD-7F4-89@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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	Hi.

On Tue, Sep 20, 2016 at 08:03:46PM +0000, ch_edge@yahoo.com wrote:
> Hi
> Could someone please advise me the best way to ensure a particular hard disk (SATA) always appears at a specific device node, i.e how can I be sure /dev/sdb for example is always going to refer to a specific drive even if others are added or removed?
> UUIDs only apply to partitions, is there no way to do a similar thing for a physical disk?
> I have some existing partitioned and formatted disks in a server which I want to plug into another machine and move the services over to a VM

It's possible, although unless you're trying to change device's
permissions permanently you'd better use those /dev/disk/by-id symlinks
instead.

What you'd need is a custom udev rule like this (in a single line):

KERNEL=="sd*", BUS=="scsi", PROGRAM=="/lib/udev/scsi_id -g -d $devnode",
RESULT==<UUID>, NAME=<devicename>

Where device UUID can be obtained by:

/lib/udev/scsi_id -g <your_block_device_here>

Another dirty hack (as it's not intended to be used this way) whould be
configuring multipathing with a single path representing your disk
device.

Reco

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Thread

'Wiring down' hard disks <ch_edge@yahoo.com> - 2016-09-20 22:10 +0200
  Re: 'Wiring down' hard disks Dan Ritter <dsr@randomstring.org> - 2016-09-20 22:20 +0200
  Re: 'Wiring down' hard disks "Neal P. Murphy" <neal.p.murphy@alum.wpi.edu> - 2016-09-20 23:20 +0200
  Re: 'Wiring down' hard disks Reco <recoverym4n@gmail.com> - 2016-09-21 17:20 +0200

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