computer boot (some times) in emergency mode.

[Chris Murphy]

On Sat, Feb 28, 2015 at 4:12 AM, Chris Murphy <lists at colorremedies.com> wrote:
>
> On Feb 28, 2015 3:37 AM, "Angelo Moreschini" <mrangelo.fedora at gmail.com>
> wrote:
>>
>> Hi
>>
>> I tried with e2fsck -f /dev/sdc1
>> but I got the message:
>
> Buried in my long first reply:
> "booting with parameter rd.break=cmdline"
>
> Chances are it's not sdc1 damaged. It's lv-root.
>
>>
>> WARNING!!!  The filesystem is mounted.   If you continue you ***WILL***
>> cause ***SEVERE*** filesystem damage.
>>
>> Of curse I didn't continue...
>>
>> How I have to do this test ?
>> Have I to boot the computer using some utility that didn't need the hard
>> disk ?
>>
>>
>>
>> On Thu, Feb 26, 2015 at 6:35 PM, Chris Murphy <lists at colorremedies.com>
>> wrote:
>>>
>>> On Thu, Feb 26, 2015 at 5:22 AM, Angelo Moreschini
>>> <mrangelo.fedora at gmail.com> wrote:
>>> > Hi Chris,
>>> >
>>> > I would be more inclined to to think about a electrical problem, since
>>> > the
>>> > only rep-plugging of the connectors of the HD solves the problem ..
>>>
>>> Cable connectors are often a source of problems.
>>>
>>> >
>>> > This is what I get with the command blkid (the output concern only the
>>> > partition where is the OS Fedora):
>>> >
>>> > /dev/sdc1: UUID="4b1e5e09-306b-4c17-8c2f-653b32e1b956" TYPE="ext4"
>>> > PARTUUID="0008635c-01"
>>> > /dev/sdc2: UUID="Vtbdeq-eq6H-sbMY-Mpme-UyFk-jx77-I5Z20K"
>>> > TYPE="LVM2_member"
>>> > PARTUUID="0008635c-02"
>>> > /dev/mapper/fedora-root: UUID="2d224b16-d37f-4eee-820a-dfcd5929e05e"
>>> > TYPE="ext4"
>>> > /dev/mapper/fedora-swap: UUID="54d55595-8c35-4e84-8566-89d8b6f340e8"
>>> > TYPE="swap"
>>> >
>>> >
>>> > so I should do :
>>> > e2fsck -f /dev/sdc1
>>> > and after
>>> > e2fsck -f /dev/sdc2
>>>
>>> Yes for sdc1, but not for sdc2 which is an LVM PV. You need to do
>>> e2fsck -f /dev/mapper/fedora/root

So I just had to do this, and LVM isn't activate this early in the
boot process using cmdline. Adding this to the end of the GRUB boot
entry linux line (after rhgb quiet) works:
rd.break=pre-mount
And then F10 or cntrl-x to boot. And then at the prompt:
e2fsck -f /dev/mapper/VG-root   ##assumes ext file system


-- 
Chris Murphy