Mounting Filesystems

[Andrew Beal]

Hi,

I am trying to build a new server for the first time (a-class running hp-ux 11.11)

I am trying to create a mount point for the omniback database to live in /var/opt/sw/omni. The logical volume size is 8GB, but when I try and mount that directory, everything in it dissapears??? I find this really strange as on rare occasions the files stay there when I mount different filesystems?? I am awfully confused... can someone please shed some light on this for me?

Thanks in advance!

Andrew

[Suhas_2]

Hi Andrew,
If I understand the problem correctly,
here is what you are trying to do ...
1> You have data in /var/opt/sw/omni. Now you have created a logical volume and you are trying to mount it as /var/opt/sw/omni. During this the data inside /var/opt/sw/omni is disappearing.

What I would suggest here is....
Initially mount the new logical volume as a temporary mount point.. say /mount.
Then dump the contents of /var/opt/sw/omni into this mount point.
Now unmount the temporary mount point.
And mount the logical volume as /var/opt/sw/omni.

Hope this helps...
Suhas.

[malay boy · Accepted solution]

Andrew,
My assumption are :
1) you already have data in /var/opt/sw/omni and this is just directory not mount point.
2) You have create a new filesystem and want to mount at /var/opt/sw/omni

Well , you need to copy out the data in /var/opt/sw/omni either to tape or another directory.
2) good practise are to delete everything in /var/opt/sw/omni before mount
3) mount the new filesystem ro /var/opt/sw/omni
4)copy back the data...


If you a mount a filesystem to directory then the data in the directory cannot be seen anymore.(it's hidden)...the data are dare but hidden..

hope this help

regards
mB

[Michael Tully]

The best way is create a separate filesystem for OB.

e.g. /omni_db
# mkdir /omni_db
turn off omniback
# /sbin/init.d/omni stop
# lvcreate -n obvol /dev/myvg
# lvextend -L 8192 /dev/myvg/obvol
# newfs -F vxfs /dev/myvg/robvol
# mount /dev/myvg/obvol /omni_db
# cd /var/opt/omni
# mv db40 /omni_db (if version 4)
There should be no other files.
# rm -rf /var/opt/omni
# ln -s /omni_db /var/opt/omni
# /sbin/init.d/omni start

update the /etc/fstab with the appropriate entries.
regards
Michael
"When I have trouble spelling, it's called fat finger syndrome"

[Andrew Beal]

Thanks for your reply, I will defiantley give that a go.

But I still dont understand why this happens??

Regards,

Andrew

[Andrew Beal]

Thanks for all your help once again, ignore my last message it seems to be sitting in the wrong spot...

Cheers ;)

Andrew