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Not getting space back after deleting ISCSI LUN
Hello I am running a ReadyNAS 104 with 4 x 4TB drives in it. Firmware 6.9.2. At some point I created 2 ISCSI LUNs for handling backups from Windows Server, each were 500GB in size and Thick p...
matthalion wrote:
At some point I created 2 ISCSI LUNs for handling backups from Windows Server, each were 500GB in size and Thick provisioned. When they were created they carved the space out of my data volume and reduced the size to 10.9TB.
You are confused on this.
4x4TB XRAID/RAID-5 gives you a 12 TB data volume. But the NAS reports space in TiB (1024*1024*1024*1024 bytes) not TB (1000*1000*1000*1000 bytes). Unfortunately it uses the TB label (Windows does the same). 12 TB is the same as 10.9 TiB. (FWIW, if you enter "12 TB in TiB" into google or bing, the search engines will convert the units for you).
So the LUN space wasn't carved out of the total data volume size. The two LUNs did take 1 TB of space on the data volume, and you should have seen the free space go up shortly after you deleted them. If you didn't see that, then try doing a balance from the volume settings wheel.
matthalion wrote:
At some point I created 2 ISCSI LUNs for handling backups from Windows Server, each were 500GB in size and Thick provisioned. When they were created they carved the space out of my data volume and reduced the size to 10.9TB.
You are confused on this.
4x4TB XRAID/RAID-5 gives you a 12 TB data volume. But the NAS reports space in TiB (1024*1024*1024*1024 bytes) not TB (1000*1000*1000*1000 bytes). Unfortunately it uses the TB label (Windows does the same). 12 TB is the same as 10.9 TiB. (FWIW, if you enter "12 TB in TiB" into google or bing, the search engines will convert the units for you).
So the LUN space wasn't carved out of the total data volume size. The two LUNs did take 1 TB of space on the data volume, and you should have seen the free space go up shortly after you deleted them. If you didn't see that, then try doing a balance from the volume settings wheel.
Thank you for the explanation.
As the LUNs were created immediately after expanding the storage to 4 x 4TB drives I did not realise that the data volume was still reporting correctly when the LUNs were removed.
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