booting single user mode
aiza21 at comclark.com
Mon Feb 22 04:04:24 UTC 2010
Jerry McAllister wrote:
> On Mon, Feb 22, 2010 at 10:39:57AM +0800, Aiza wrote:
>> Looking for conformation.
>> On booting into single user mode all files systems are unmounted except
>> / which is mounted read only.
>> Is this true?
>> Will dump/restore commands work?
> Generally yes. Make sure they are in your path and available to you
> in whatever filesystem[s] you have mounted. I think they normally are.
> I believe dump and restore are in /sbin which should be part of your
> root filesystem and not in its own partition. ==Never put those things
> that should be in root in their own partitions==
> To check where they are use 'which' which dump or which restore
> will tell you where they are.
> When you dump a non mounted filesystem, I think you have to use
> the partition name, not the mount name.
> So, instead of
> dump 0afL /dev/nsa0 /usr
> it might be
> dump 0afL /dev/nsa0 /dev/ad0s1d
> if your mount a partition /dev/ad0s1d as /usr normaly.
> You don't really need to restore to an unmounted partition, though
> using single user might be useful. If you are restoring in single
> user, do something like this.
> fsck -a
> mount -u /
> mount -a
> cd /usr
> restore -rf /dev/nsa0
> Note: I am using /dev/nsa0 as where the dump media is. that would
> be a tape device. You need to adjust this for where you really
> write the dump or have the dump stored.
Think mistake here dump 0afL /dev/nsa0 /usr
Whole reason for doing dump in single user mode is no snapshot so no
need for -L flag in your example dump command.
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