[SPDK] Installation of Spdk and running bdev command

I installed Spdk 
git clone https://github.com/spdk/spdk
cd spdk
git submodule update --init
 sudo scripts/pkgdep.sh --all
./configure
make
/test/unit/unittest.sh
But not able to run 
RPC.py bdev_aio_create /dev/sda aio 
It is not running 
scripts/rpc.py bdev_aio_create /dev/sda aio ev/sda Traceback (most recent call last): File "/root/spdk/scripts/rpc/client.py", line 71, in connect

device self.sock.connect ( (addr, port)) socket.gaierror: [Errno -2] Name or service not known

mp/fil, During handling of the above exception, another exception occurred:

e deviceTraceback (most recent call last): File "scripts/rpc.py", line 2693, in <module>

odev_aid conn_retries=args.conn_retries) File "7root/spdk/scripts/rpc/client.py", line 47, in init

ioe

self. connect (addr, port)

File "/root/spdk/scripts/rpc/client.py", line 76, in _connect. "Error details: %s" (addr, ex))

rpc.client..JSONRPCException: Error while connecting to /var/tmp/spdk.sock ev Error details: [Errno -2] Name or service not known [root(a)d1560g9-12-vm20 spdk] #

ased on Open CAS Framework - a high performance block storage cachina meta-librar

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