No, all of the data is still available on the physical hard drives. Each hard drive contains metadata which tells the xStack Storage unit what RAID volume(s) it is part of and how to assemble these volumes to access the data. You can replace the bad controller and restart the unit, or simply move the drives to a new xStack Storage unit. When the xStack Storage unit boots, it reads the metadata on each drive to determine how to assemble the volumes.

You can see that recovery of volume information and data will be simple. However, all of the information concerning the target nodes, initiators, network portals, etc. will need to be recovered to the new controller or xStack Storage unit. This information can be saved to a configuration file through the management GUI. Therefore, it is recommended that once you have configured your xStack Storage unit to its final configuration, take a moment and save the configuration to a file. In the unlikely event of a controller failure, you will find this file makes recovery much easier. Otherwise, if the configuration is not saved prior to the failure, you will need to manually configure the xStack Storage unit-¦s target nodes, initiators, network portals, etc. to what they had initially been.