On Wed, 2015-05-27 at 09:16 -0400, Phil Turmel wrote:

On 05/27/2015 08:27 AM, Roman Mamedov wrote:

quoted

On Wed, 27 May 2015 14:10:03 +0200
Carsten Aulbert [off-list ref] wrote:

quoted

On 05/27/2015 02:04 PM, Michael Munger wrote:

quoted

Or, does the OS have access to serial numbers, etc...?

I have to guide someone through a drive replacement on the phone, and it
would be great if I could tell them exactly which drive to swap out...

If you have direct knowledge, which serial number is where, you could
use hdparm -I /dev/sdX or smartctl -a /dev/sdX against the still
reachable drives.

If /dev/sdc is still present in the system (even if not responding correctly to
hdparm or smartctl anymore), you should be able to find its serial number from
the udev symlink that was registered earlier, by running e.g.:

  ls -la /dev/disk/by-id/ | grep sdc$

Serial number is typically the last piece of the ID, after the manufacturer
name and model number.

This is one of the reasons I wrote lsdrv [1], especially after I noticed
that the port sequence it reports is stable for the various ports on
every mobo  and sata expansion card I've handled.  Per controller, at least.

Interesting that you should say that as on my z97 board if I do a power
off, power on, the drives do indeed stay numbered to the sata ports...
however if I do a "restart" sometimes, very rarely, the drives are
listed with different sdX designations. It may be a quirk of either the
efi, linux, or the fact the drives are not, I believe, turned off during
a restart which may impact on designation. I didn't investigate the whys
as I just noticed that two drives had swapped in two arrays (sdb moved
from a raid10 into the raid6 and that sdc moved from the raid6 into the
raid10) which scared the heck out of me until I realised that it was
just the sdX that had changed not the drives so for one minute I was
expecting massive problems to ensue.

I save of copy of an lsdrv report for each system I commission so that
there's no ambiguity later.

Phil

[1] https://github.com/pturmel/lsdrv

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