Chained mount

[nolim073]

Hello,
i have this file structure
/prod
/prod/x1
/prod/x2

/prod is a dedicated file system and x1 and x2 are dirs.

Now some users want me to create a dir x3 under /prod and mount a another file system..... my question is it allowed?
ie /prod/x3 --> can this be another dedicated file system or will doing this will hide x1 and x2?

 

[sbrews]

What they are asking for can be done. The only catch is: when mounting everything - like after a reboot - you must make sure that /prod gets mounted first.

IE if you mount in this order:

/prod
/prod/x3

you will be able to see /prod, /prod/x1, /prod/x2 and /prod/x3 (the new sub mount point)

If you mount in this order:

/prod/x3
/prod

you will only see /prod, /prod/x1 and /prod/x2. /prod/x3 will be hidden until you umount /prod (x1 and x2 would go with it).

scott

 

[Annihilannic]

If you mount in this order:

/prod/x3
/prod

you will only see /prod, /prod/x1 and /prod/x2. /prod/x3 will be hidden until you umount /prod (x1 and x2 would go with it).

One way to prevent this is to avoid creating a /prod/x3 directory on the root filesystem, that way you will be unable to mount /prod/x3 until /prod (which contains an x3 directory/mount point) is mounted.

Annihilannic.

 

[coffeysm]

You could also create the new system and mount it somewhere else. Then create a symbolic link in the /prod directory.

mount /new_fs
cd /prod
ln -s /new_fs x3

 

[sbrews]

thats what I love about *nix. So many ways to do things and they are all right.

 

[nitinkgoud]

Thanks a log guys.