I'm using proxmox[1] and OpenVZ with multiple bind mounts[2] and quotas. This is possible because the quotas are managed by other containers.
For example, I want have a LAMP server with two bind mounts, one for the web files (100GB) and another for the MySQL (50GB). I do the following steps:
1. Create 3 containers:
a) webserver101 (id 101): disk 4GB
b) storage102 (id 102): disk 100GB
c) storage103 (id 103): disk 50GB
2. Start all the containers.
3. Generate the folders to mount if doesn't exist. I want mount folders with the name of the container to folders with the of the service:
root@host:~# mkdir /var/lib/vz/root/101/home/www
root@host:~# mkdir /var/lib/vz/root/101/home/mysql
root@host:~# mkdir /var/lib/vz/root/102/home/storage102
root@host:~# mkdir /var/lib/vz/root/103/home/storage103
4. Generate the bind mounts[2] for webserver101 in the host:
root@host:~# cat /etc/vz/conf/101.mount
#!/bin/bash
. /etc/vz/vz.conf
. ${VE_CONFFILE}
SRC1=/var/lib/vz/private/102/home/storage102
DST1=/home/www
SRC2=/var/lib/vz/private/103/home/storage103
DST2=/home/mysql
mount -n -t simfs ${SRC1} ${VE_ROOT}${DST1} -o ${SRC1}
mount -n -t simfs ${SRC2} ${VE_ROOT}${DST2} -o ${SRC2}
5. Restart the container webserver101. It's very important start first the storage containers because they manage the quotas.
The bind mounts in the host:
root@ns398468:~# df -h|grep vz
/dev/mapper/pve-data 1.8T 323G 1.4T 19% /var/lib/vz
/var/lib/vz/private/102 100G 603M 100G 1% /var/lib/vz/root/102
none 256M 4.0K 256M 1% /var/lib/vz/root/102/dev
none 52M 1.0M 51M 2% /var/lib/vz/root/102/run
none 5.0M 0 5.0M 0% /var/lib/vz/root/102/run/lock
none 256M 0 256M 0% /var/lib/vz/root/102/run/shm
/var/lib/vz/private/103 50G 603M 50G 2% /var/lib/vz/root/103
none 256M 4.0K 256M 1% /var/lib/vz/root/103/dev
none 52M 1.0M 51M 2% /var/lib/vz/root/103/run
none 5.0M 0 5.0M 0% /var/lib/vz/root/103/run/lock
none 256M 0 256M 0% /var/lib/vz/root/103/run/shm
/var/lib/vz/private/101 4.0G 603M 3.5G 15% /var/lib/vz/root/101
/var/lib/vz/private/102/home/storage102 100G 603M 100G 1% /var/lib/vz/root/101/home/www
/var/lib/vz/private/103/home/storage103 50G 603M 50G 2% /var/lib/vz/root/101/home/mysql
none 2.0G 4.0K 2.0G 1% /var/lib/vz/root/101/dev
none 410M 1.0M 409M 1% /var/lib/vz/root/101/run
none 5.0M 0 5.0M 0% /var/lib/vz/root/101/run/lock
none 2.0G 0 2.0G 0% /var/lib/vz/root/101/run/shm
The bind mounts in the container:
root@ns398468:~# vzctl enter 101
entered into CT 101
root@webserver101:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/simfs 4.0G 603M 3.5G 15% /
/dev/simfs 100G 603M 100G 1% /home/www
/dev/simfs 50G 603M 50G 2% /home/mysql
none 2.0G 4.0K 2.0G 1% /dev
none 410M 1.0M 409M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 2.0G 0 2.0G 0% /run/shm
I'm sure there is a better solution that don't need to create storage containers and waste disk space and memory but this work for me 
[1] See proxmox DOT com
[2] See article of jamescoyle DOT net -> search in google 525-proxmox-bind-mount-mount-storage-in-a-container (sorry, cannot use links because limit of the forum)
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