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permalink · #1 (**permalink**) 01-16-2008, 06:50 PM

Good Evening:

I am relativly new to HPUX and was wondering if someone can tell me:

->What exactly happens in Single user mode? (I have read the manpage on hpux
(1M) and all I can find is that in signle user mode root volume is mounted).
Is there anything else.

->What about LVM maintainence mode? (Again manpage says that its single user
mode + LVM t/s mode to do lvm maintainence).

The reason I ask is, (for example), I need to extend " /usr", I go to single
user mode and give /sbin/lvextend command to extend it, and all works out
good. However, according to my LVM readings, a Volume Group needs to be
"de-activated" before any operation can be performed on it. Now, since VG00
is activated (root volume mounted is on VG00), how can I still do my
lvextend on LV belonging to VG00, without deactivating it? (since VG00 can't
be deactivated in either Single Use mode or LVM maint. mode)?

A little confused (or more likely missing something)!

Thank u for your advise.

permalink · #2 (**permalink**) 01-16-2008, 06:50 PM

Hi NG

> ->What exactly happens in Single user mode? (I have read the manpage on hpux
> (1M) and all I can find is that in signle user mode root volume is mounted).
> Is there anything else.

The root volumegroup is activated.
/ (and assumingly /stand) is mounted.
No rc script has been run.
The Console provides a login for the root account.

> ->What about LVM maintainence mode? (Again manpage says that its single user
> mode + LVM t/s mode to do lvm maintainence).
Maintainance mode is a mode, which is used when the LVM configuration is
torn up. The maintainance mode assumes some standard LVM configurations
and tries to set on this basis a partly working system.
This is not used for standard administrations like expanding a volume.

> The reason I ask is, (for example), I need to extend " /usr", I go to single
> user mode and give /sbin/lvextend command to extend it, and all works out
> good. However, according to my LVM readings, a Volume Group needs to be
> "de-activated" before any operation can be performed on it. Now, since VG00
> is activated (root volume mounted is on VG00), how can I still do my
> lvextend on LV belonging to VG00, without deactivating it? (since VG00 can't
> be deactivated in either Single Use mode or LVM maint. mode)?
>
> A little confused (or more likely missing something)!

Your confusion is caused on the misinformation, that "any operation"
can be performed only with de-activated VG.
It better should be said: most operations can be done with activated
volumegroup only, but some require a deactivated volume group.

Extending /usr (without advanced-JFS) has to be done in single user mode.

Florian

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Confused: Single User Mode and LVM Maint. mode