From: Grant <emailgrant@gmail.com>
To: Gentoo mailing list <gentoo-user@lists.gentoo.org>
Subject: Re: [gentoo-user] Rename /dev/nvme0n1 to /dev/sda
Date: Sun, 3 Sep 2017 15:41:12 -0700 [thread overview]
Message-ID: <CAN0CFw3KanJN1QbQs0pPX8_odeSOb8+PzX+DTWQSPT2erpgi7g@mail.gmail.com> (raw)
In-Reply-To: <CAJ0EP40EN1ZgEVWJZxaueRYhz_jQdJNcWotF49UEH5D4VB7SGQ@mail.gmail.com>
>>>> My new laptop uses /dev/nvme0n1 instead of /dev/sda which conflicts
>>>> with the script I use to manage about 12 similar laptops running
>>>> Gentoo. Is there a udev method for renaming the disk that will work
>>>> well with any USB disks that happen to also be attached?
>>>
>>> I'm not certain what you mean by that, but I would guess that you want
>>> the nvme disk to show up as /dev/sda, and the USB disk(s) to show up
>>> as /dev/sd[b-z].
>>>
>>> It is not possible to accomplish this using udev; the kernel owns the
>>> /dev/sdX device namespace, and will sequentially create devices nodes
>>> for SCSI-like block devices using that namespace. There is no way to
>>> change that using a udev rule.
>>
>>
>> Can I rename /dev/sda to /dev/sd[b-z] if it's attached via USB, and
>> then rename /dev/nvme0n1 to /dev/sda if /dev/nvme0n1 exists?
>>
>> Alternatively, can I rename /dev/sda to /dev/sd[b-z] if /dev/sda and
>> /dev/nvme0n1 exist, and then rename /dev/nvme0n1 to /dev/sda if
>> /dev/nvme0n1 exists?
>
> You might technically be able to do it, but I would guess it would
> cause some nasty race conditions between the kernel and udev. It's a
> bad idea.
Is it the conditionals that cause this to be a bad idea? Because I
believe udev has functionality designed to rename devices exactly like
this.
- Grant
next prev parent reply other threads:[~2017-09-03 22:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-01 16:10 [gentoo-user] Rename /dev/nvme0n1 to /dev/sda Grant
2017-09-02 2:58 ` R0b0t1
2017-09-02 6:48 ` Andrew Savchenko
2017-09-02 13:14 ` Canek Peláez Valdés
2017-09-03 17:59 ` Grant
2017-09-03 18:11 ` Canek Peláez Valdés
2017-09-04 4:26 ` J. Roeleveld
2017-09-04 5:08 ` Canek Peláez Valdés
2017-09-02 14:35 ` Mike Gilbert
2017-09-03 18:11 ` Grant
2017-09-03 22:24 ` Mike Gilbert
2017-09-03 22:41 ` Grant [this message]
2017-09-04 1:26 ` Mike Gilbert
2017-09-04 1:38 ` Rich Freeman
2017-09-04 14:58 ` Grant
2017-09-04 15:00 ` Grant
2017-09-04 15:33 ` J. Roeleveld
2017-09-04 15:40 ` Mike Gilbert
2017-09-04 19:22 ` Grant
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