I apologize if this is not the right place to file this information but I want to make sure that others do not have to go thru the same hassle we had to, particularly restoring entire virtual disk (4TB) due to a failed expansion process. So this is not a question but more a warning.
We have started expansion of a virtual disk from 4TB (5 x 1TB SATA in RAID5) to 5TB (adding one 1TB hdd to total of 6 x 1TB). After one day, we found out that the process will take about 30 days (from our perspective, this is already unacceptable). We opened a case with HP technical support and the answer was "...can happen...".
Several days down the road the device reported error, we opened another case with HP, they gave us instruction on what to do and said the expansion process should complete successfully and then start a rebuild process automatically.
The rebuild process just completed, the virtual drive is offline (2 hdd offline), most likely all data lost.
We are waiting for HP support for their response.
In the meantime, recommendation: Do not perform expansion of virtual drives on these device, too risky. Rather create new virtual disks and make them available to your hosts/servers.