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Best practices of using the Synology DiskStation to host iSCSI Storage
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==Thin Provisioning and Over-allocation== [[Image:Iscsi-thinProvisioningOverAllocate.png|500px|center]] *Note: Thin Provisioning and Over-allocation is available for file-level iSCSI Targets only *[[wikipedia:Thin_provisioning#Overview|Thin Provisioning]] allows for storage to grow on demand, where if there's a 100GB target, 100GB of space on the physical volume will be allocated for the use of the iSCSI Target. However, the physical storage will not be committed towards the iSCSI Target until it is utilized by the virtual space. **A larger benefit of using Thin Provisioning is where the iSCSI Target storage can be [[How_to_use_the_iSCSI_Target_Service_on_the_Synology_DiskStation#Step_1:_2|adjusted]] on the fly, allowing targets space to grow instantaneously from 100GB to 200GB with a single click. *[[wikipedia:Thin_provisioning#Over-allocation|Over-allocation]] allows for an iSCSI Target to virtually have greater space than what is physically available. This is mainly beneficial for those environments where it's not known how much space is required - so it's easier to create a large storage pool immediately, and be concerned about the physical storage needs at a later point. **However, the physical storage will have to be updated eventually, if the virtual storage requirements exceeds what is physically available, then no more data can be written within the virtual space, which may result in lost or damaged data. It is the administrator's responsibility to ensure that there is plenty of physical space to accommodate the virtual storage needs.
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