[DRBD-user] tough mount problem in fstab, help!

flyneo at cogeco.ca flyneo at cogeco.ca
Thu Aug 26 22:46:37 CEST 2004

Note: "permalinks" may not be as permanent as we would like,
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Hi Bernd,

Sorry for the misleading information and thank you for the reply.

My situation is: I need to backup some subdirectories in /var through drbd between two identical machines. My /var
directory is a seperate partition
(hda6). So if I want to backup /var/www, what I have done is:
* add a resource block in drbd.conf like
on node1{
  device = /dev/nb0
  disk = /dev/hda6

* add a line to /etc/fstab as:
/dev/nb0    /var/www    ext3   defaults,noauto   0   0

Then I am trying to start drbd by 'drbd start', it gave a error message that 'lower device(/dev/hda6) is already
mounted'. So I thought if I should umount /dev/hda6 by removing the line 'LABEL=/var /var ext3 defaults 1 2' from my
/etc/fstab file. However, this would cause more error since some startup scripts will use directories in /var while /var
didn't exist anymore at startup.

The primary machine is a legal system, so I can't do any change to the partition nor do I move the directories.

Any suggestion for me? Thanks a lot!


> Hi Dong,
> > I am trying to build up a cluster system.
> > '/var/www' is the only directory in '/var' that I want to duplicate through
> > drbd. Other directories in '/var' should be remained unchanged. My question
> > is:
> >
> > 1. I should add such line in fstab:
> > /dev/nb0       /var/www  defaults,noauto          0 0
> > , but should I remove the old line:
> > LABEL=/var     /var      ext3     defaults        1 2
> >
> > 2. If remove the old line, many other services will stop working on the
> > slave machine since they access the /var which is not mounted. And the
> > rc.sysint script, which is excuted at system startup to clean some useless
> > content in /var, will also fail at startup.
> what are you trying to do? Why do you want to remove the fstab entry for /var?
> How do you mount /var on you primary system? When there is no /var, this
> system you also fail.
> As far as I understand your mail, you only want to duplicate /var/www, so so
> far there's no reason to remove the /var entry from your fstab. Unless you
> perhaps moved /var to your / partition ...?
> Cheers,
>     Bernd
> [Attachment: bernd-schubert at web.de.sig]

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