[CentOS] rare but repeating system crash in C7

Sun Jan 3 19:18:24 UTC 2021
Simon Matter <simon.matter at invoca.ch>

> $ cat /etc/centos-release
> CentOS Linux release 7.9.2009 (Core)
>
> $ sudo systemctl status mnt-backup.mount mnt-backup.automount
> [sudo] password for fredex:
> ● mnt-backup.mount - /mnt/backup
>    Loaded: loaded (/etc/fstab; bad; vendor preset: disabled)
>    Active: active (mounted) since Sat 2021-01-02 22:20:05 EST; 14h ago
>     Where: /mnt/backup
>      What: /dev/sdc1
>      Docs: man:fstab(5)
>            man:systemd-fstab-generator(8)
>     Tasks: 0
>
> ● mnt-backup.automount
>    Loaded: loaded
>    Active: inactive (dead)
>     Where: /mnt/backup
> [fredex at fcshome Desktop]$ systemctl cat mnt-backup.mount
> mnt-backup.automount
> No files found for mnt-backup.automount.
> # /run/systemd/generator/mnt-backup.mount
> # Automatically generated by systemd-fstab-generator
>
> [Unit]
> SourcePath=/etc/fstab
> Documentation=man:fstab(5) man:systemd-fstab-generator(8)
> RequiresOverridable=systemd-fsck at dev-disk-by
> \x2duuid-259ec5ea\x2de8a4\x2d465a\x2
> After=systemd-fsck at dev-disk-by
> \x2duuid-259ec5ea\x2de8a4\x2d465a\x2d9263\x2d1c062
>
> [Mount]
> What=/dev/disk/by-uuid/259ec5ea-e8a4-465a-9263-1c06217b9aaf
> Where=/mnt/backup
> Type=ext4
> Options=noauto
>
> the fstab statement I put in my last posting was a copy/paste from
> /etc/fstab, so it should be correct as shown. I don't see a comma before
> noauto.
>

Did you already try a reboot?

Don't ask me why I ask this.

Regards,
Simon

>
>
> On Sun, Jan 3, 2021 at 11:42 AM Strahil Nikolov <hunter86_bg at yahoo.com>
> wrote:
>
>> Are you still on 7.6 ? I recently discovered that a bug in sysstat was
>> fixed in 7.7 that prevented autofs from umounting the filesystem.
>>
>> The following should show if it's taking into action:
>> systemctl status mnt-backup.mount mnt-backup.automount
>> systemctl cat mnt-backup.mount mnt-backup.automount
>>
>>
>> Are you sure that you got no "," before that "noauto" ?
>>
>> Best Regards,
>> Strahil Nikolov
>>
>>
>>
>>
>>
>>
>> В неделя, 3 януари 2021 г., 16:25:47 Гринуич+2, Fred <
>> fred.fredex at gmail.com> написа:
>>
>>
>>
>>
>>
>> Strahil:
>>
>> I WAS using that, but the automatic umount never worked, leaving it
>> mounted all the time.
>>
>> I commented out those entries in /etc/auto.master before modifying the
>> fstab entry:
>>
>> UUID=259ec5ea-e8a4-465a-9263-1c06217b9aaf       /mnt/backup
>> ext4,x-systemd.automount,x-systemd.idle-timeout=15min   noauto  0
>> 2
>>
>> which is exactly as it was before except for the x-systemd entries as
>> you
>> described.
>>
>> and the peculiar thing is it STILL does not automount. and yes, I did do
>> systemctl restart local-fs.target.
>>
>> do I need to reboot (or something simpler, maybe) to fully disable the
>> auto.master stuff?
>>
>> Thanks again!
>>
>> Fred
>>
>> On Sun, Jan 3, 2021 at 5:54 AM Strahil Nikolov via CentOS <
>> centos at centos.org> wrote:
>> > Hi Fred,
>> >
>> > do you use automatic umount for the map in /etc/auto.master
>> (--timeout) ?
>> >
>> > If yes, then the systemd mount options probably won't help.
>> >
>> > Best Regards,
>> > Strahil Nikolov
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > В неделя, 3 януари 2021 г., 04:27:17 Гринуич+2, Fred <
>> fred.fredex at gmail.com> написа:
>> >
>> >
>> >
>> >
>> >
>> > Yeah, and the instructions for setting RAID-1 or RAID-0 have the
>> switch
>> > positions exactly reversed.
>> >
>> > Strahil: I'm using autofs to automount the unit. but just turned that
>> off
>> > and enabled the xsystemd.automount in fstab, we'll see how that works.
>> >
>> > Fred
>> >
>> >
>> > On Sat, Jan 2, 2021 at 4:11 PM Warren Young <warren at etr-usa.com>
>> wrote:
>> >
>> >> On Jan 2, 2021, at 11:17 AM, Fred <fred.fredex at gmail.com> wrote:
>> >> >
>> >> > I assume that the yottamaster device runs Linux, just like 99% of
>> other
>> >> > such devices.
>> >>
>> >> 99% of NAS boxes, maybe, but not dumb RAID boxes like the one I
>> believe
>> >> you’re referring to.
>> >>
>> >> (And I doubt even that, with the likes of FreeNAS extending down from
>> the
>> >> enterprise space where consumer volume can affect that sort of
>> thing.)
>> >>
>> >> I have more than speculation to back that guess: the available
>> firmware
>> >> images are far too small to contain a Linux OS image, their manuals
>> don’t
>> >> talk about Linux or GPL that I can see, and there’s no place to
>> download
>> >> their Linux source code per the GPL.
>> >>
>> >> While doing this exploration, I’ve run into multiple problems with
>> their
>> >> web site, which strengthens my suspicion that this box is your
>> culprit.  If
>> >> they’re this slipshod with their marketing material, what does that
>> say
>> >> about their engineering department?
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>> >
>> >>
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