Re: [SLE] fsck when uptime cannot be broken?

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Date: Fri, 1 Apr 2005 20:52:49 +0200 (CEST)
To: SLE <suse-linux-e@suse.com>

The Friday 2005-04-01 at 11:57 +0200, Hylton Conacher (ZR1HPC) wrote:

> I have seen many folk who have signatures stating that the machine has been
> running for something like 400 days.
>
> Whilst I applaud this type of reliability, I am wondering about the actual fs
> as the machine isn't rebooted so that fsck can check the partitions.
>
> I am perhaps paranoid about keeping the fs in tip top shape but it is the
> basis that we all rely on.

YES! You are! :-P X'-)

> so my question is this: Can a system that has such uptime have its all its fs
> checked and not be rebooted?

No need to check them... this is linux, stability is the word here ;-)

> Could a system Linux boot floppy specific to the system be inserted, mounted,
> and then be told to unmount the running systems partitions listed in the
> fstab(except the floppy, and fsck them and then re-mount them, without losing
> the uptime figure?

Hah! That floppy has no chance. If it is a boot floppy, it can not boot -
unless you reboot. If it is a program, it has no other access than the
running system has.

The only posibility is umount a partition, one that is not used at the
time, then fsck it. That means that you will never be able to check "/".
In fact, you can not even check "/home" without login everybody off first.

The only theoretical posibility would be, when using a raid 1, mirror, and
puting it in single disk mode (if possible in linux, I don't know). One of
the halfs would be active, the other could be checked. The problem, and a
big one, would be when reactivating the raid: files will have changed
during that time: how can you resync both drives...? a nightmare.

I know a machine that can do that, kind of, but not a linux machine, and
not a PC, and with a really huge price tag.

-- 
Cheers,
       Carlos Robinson
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