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Block Device Mapping is Invalid

I have installed DevStack recently. When I try to create a new instance I get this error msg:"Block Device Mapping is Invalid". I found out that there is an item,"loop1", on my block device list which my total volume size is limited to the free space of it. In another word, when I try to create an instance with volume size larger than the free space of "loop1", I get the error message. How can I solve this problem? or how can I increase the loop1 volume size? image description

Block Device Mapping is Invalid

I have installed DevStack recently. When I try to create a new instance I get this error msg:"Block Device Mapping is Invalid". I found out that there is an item,"loop1", on my block device list which my total volume size is limited to the free space of it. In another word, when I try to create an instance with volume size larger than the free space of "loop1", I get the error message. How can I solve this problem? or how can I increase the loop1 volume size? image description