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References: <20120802013404.3c67615a@weird.wonkology.org>
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Date: Wed, 1 Aug 2012 19:01:54 -0500
Message-ID: <CADPrc83viVv-+vPma99PYbbZ1OcY05GVbqodWM_EtPPsy=EtTQ@mail.gmail.com>
Subject: Re: [gentoo-user] Udev rules for identical hard drives
From: =?UTF-8?B?Q2FuZWsgUGVsw6FleiBWYWxkw6lz?= <caneko@gmail.com>
To: gentoo-user@lists.gentoo.org
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On Wed, Aug 1, 2012 at 6:59 PM, Canek Pel=C3=A1ez Vald=C3=A9s <caneko@gmail=
.com> wrote:
> On Wed, Aug 1, 2012 at 6:34 PM, Alex Schuster <wonko@wonkology.org> wrote=
:
>> Hi there!
>>
>> I do not understand the numbering of my hard drives. There may be some
>> inherent logic, but whenever I make some changes, like replacing drives,
>> or changing BIOS settings, the order changes. Maybe it's even more rando=
m.
>>
>> So I made some udev rules like this, and my drives are called /dev/hd1,
>> hd2 and hd3:
>>
>> SUBSYSTEMS=3D=3D"scsi", KERNEL=3D=3D"sd?", ATTRS{model}=3D=3D"SAMSUNG HD=
154UI",
>> SYMLINK=3D"hd1"
>>
>> This works fine, and this way I can address them in scripts, smartd and
>> hdparm config files and such. But now I have two identical drives. I had
>> this before with the drive above, but while being identical models, the
>> two drives differed a little in size, so I just had to add ATTR{size}.
>> This does not help with my current drives, and I find nothing
>> in /sys/block/sd?/device/ that differs. Could there be another way to
>> distinguish the drives, like looking at the partition scheme or somethin=
g?
>
> If you want to distinguish partitions, I would recommend using labels
> (in fstab too); those never change unless you specifically change
> them. Then, no matter how you put them in your machine, they will get
> mounted correctly, and then you don't need to fuzz with udev rules.
> Also, as a superficial bonus, they get mounted using the label and it
> looks nice in your file browser.
>
> The drives themselves I see no reason to recognize them, why do you
> need to do that?
Oh, and I forgot; doesn't the links in /dev/disk/by-id,
/dev/disk/by-label, /dev/disk/by-uuid do what you want to?
Regards.
--=20
Canek Pel=C3=A1ez Vald=C3=A9s
Posgrado en Ciencia e Ingenier=C3=ADa de la Computaci=C3=B3n
Universidad Nacional Aut=C3=B3noma de M=C3=A9xico