'Virtual Storage' Concept

According to Wikipedia "Storage virtualization refers to the process of abstracting local storage from physical storage". That means you can see in your system an attached device which actually is no physically connected in your machine, but logically.

Nowadays, there are several file systems such as ZFS or BTRFS (on development) that offers you the possibility to create volumes from pools.

AbiCloud uses Virtual Storage to serve on-demand volumes using Storage Pools. You can use these resources to attach them in any of your deployed Virtual Machines.

In other words, abiCloud faciltiate users the possibility to create iSCSI volumes and attach them in different virtual machines in order to offer a persistence layer to store sensible data that can't be eresed (log files, webapp files, DB, etc.)

References:
[1] Wikipedia Storage Virtualization definition: http://en.wikipedia.org/wiki/Storage_virtualization