diff --git a/test/vhost/common.sh b/test/vhost/common.sh
index 96d5ba257..ecfce609f 100644
--- a/test/vhost/common.sh
+++ b/test/vhost/common.sh
@@ -1,16 +1,21 @@
 : ${SPDK_VHOST_VERBOSE=false}
-: ${VM_IMAGE="$HOME/vhost_vm_image.qcow2"}
+: ${VHOST_DIR="$HOME/vhost_test"}
 
 TEST_DIR=$(readlink -f $rootdir/..)
+VM_DIR=$VHOST_DIR/vms
+TARGET_DIR=$VHOST_DIR/vhost
+
+#TODO: Move vhost_vm_image.qcow2 into VHOST_DIR on test systems.
+VM_IMAGE=$HOME/vhost_vm_image.qcow2
 
 if ! hash qemu-img qemu-system-x86_64; then
 	error 'QEMU is not installed on this system. Unable to run vhost tests.'
 	exit 1
 fi
 
-VM_BASE_DIR="$TEST_DIR/vms"
-
-mkdir -p $TEST_DIR
+mkdir -p $VHOST_DIR
+mkdir -p $VM_DIR
+mkdir -p $TARGET_DIR
 
 #
 # Source config describing QEMU and VHOST cores and NUMA
@@ -98,13 +103,13 @@ function get_vhost_dir()
 		local vhost_num=0
 	fi
 
-	echo "$TEST_DIR/vhost${vhost_num}"
+	echo "$TARGET_DIR/${vhost_num}"
 }
 
 function vhost_list_all()
 {
 	shopt -s nullglob
-	local vhost_list="$(echo $TEST_DIR/vhost[0-9]*)"
+	local vhost_list="$(echo $TARGET_DIR/[0-9]*)"
 	shopt -u nullglob
 
 	if [[ ! -z "$vhost_list" ]]; then
@@ -304,7 +309,7 @@ function vm_num_is_valid()
 function vm_ssh_socket()
 {
 	vm_num_is_valid $1 || return 1
-	local vm_dir="$VM_BASE_DIR/$1"
+	local vm_dir="$VM_DIR/$1"
 
 	cat $vm_dir/ssh_socket
 }
@@ -312,7 +317,7 @@ function vm_ssh_socket()
 function vm_fio_socket()
 {
 	vm_num_is_valid $1 || return 1
-	local vm_dir="$VM_BASE_DIR/$1"
+	local vm_dir="$VM_DIR/$1"
 
 	cat $vm_dir/fio_socket
 }
@@ -359,7 +364,7 @@ function vm_scp()
 function vm_is_running()
 {
 	vm_num_is_valid $1 || return 1
-	local vm_dir="$VM_BASE_DIR/$1"
+	local vm_dir="$VM_DIR/$1"
 
 	if [[ ! -r $vm_dir/qemu.pid ]]; then
 		return 1
@@ -386,7 +391,7 @@ function vm_is_running()
 function vm_os_booted()
 {
 	vm_num_is_valid $1 || return 1
-	local vm_dir="$VM_BASE_DIR/$1"
+	local vm_dir="$VM_DIR/$1"
 
 	if [[ ! -r $vm_dir/qemu.pid ]]; then
 		error "VM $1 is not running"
@@ -409,7 +414,7 @@ function vm_os_booted()
 function vm_shutdown()
 {
 	vm_num_is_valid $1 || return 1
-	local vm_dir="$VM_BASE_DIR/$1"
+	local vm_dir="$VM_DIR/$1"
 	if [[ ! -d "$vm_dir" ]]; then
 		error "VM$1 ($vm_dir) not exist - setup it first"
 		return 1
@@ -435,7 +440,7 @@ function vm_shutdown()
 function vm_kill()
 {
 	vm_num_is_valid $1 || return 1
-	local vm_dir="$VM_BASE_DIR/$1"
+	local vm_dir="$VM_DIR/$1"
 
 	if [[ ! -r $vm_dir/qemu.pid ]]; then
 		return 0
@@ -455,17 +460,17 @@ function vm_kill()
 	fi
 }
 
-# List all VM numbers in VM_BASE_DIR
+# List all VM numbers in VM_DIR
 #
 function vm_list_all()
 {
-	local vms="$(shopt -s nullglob; echo $VM_BASE_DIR/[0-9]*)"
+	local vms="$(shopt -s nullglob; echo $VM_DIR/[0-9]*)"
 	if [[ ! -z "$vms" ]]; then
 		basename --multiple $vms
 	fi
 }
 
-# Kills all VM in $VM_BASE_DIR
+# Kills all VM in $VM_DIR
 #
 function vm_kill_all()
 {
@@ -474,10 +479,10 @@ function vm_kill_all()
 		vm_kill $vm
 	done
 
-	rm -rf $VM_BASE_DIR
+	rm -rf $VM_DIR
 }
 
-# Shutdown all VM in $VM_BASE_DIR
+# Shutdown all VM in $VM_DIR
 #
 function vm_shutdown_all()
 {
@@ -513,7 +518,7 @@ function vm_shutdown_all()
 		sleep 1
 	done
 
-	rm -rf $VM_BASE_DIR
+	rm -rf $VM_DIR
 
 	$shell_restore_x
 	error "Timeout waiting for some VMs to shutdown"
@@ -573,14 +578,14 @@ function vm_setup()
 		vm_num=$force_vm
 
 		vm_num_is_valid $vm_num || return 1
-		local vm_dir="$VM_BASE_DIR/$vm_num"
+		local vm_dir="$VM_DIR/$vm_num"
 		[[ -d $vm_dir ]] && warning "removing existing VM in '$vm_dir'"
 	else
 		local vm_dir=""
 
 		set +x
 		for (( i=0; i<=256; i++)); do
-			local vm_dir="$VM_BASE_DIR/$i"
+			local vm_dir="$VM_DIR/$i"
 			[[ ! -d $vm_dir ]] && break
 		done
 		$shell_restore_x
@@ -603,7 +608,7 @@ function vm_setup()
 		fi
 
 		os_mode="original"
-		os="$VM_BASE_DIR/$vm_incoming/os.qcow2"
+		os="$VM_DIR/$vm_incoming/os.qcow2"
 	elif [[ ! -z "$vm_migrate_to" ]]; then
 		[[ "$os_mode" != "backing" ]] && warning "Using 'backing' mode for OS since '--migrate-to' is used"
 		os_mode=backing
@@ -828,8 +833,8 @@ function vm_setup()
 	echo $gdbserver_socket > $vm_dir/gdbserver_socket
 	echo $vnc_socket >> $vm_dir/vnc_socket
 
-	[[ -z $vm_incoming ]] || ln -fs $VM_BASE_DIR/$vm_incoming $vm_dir/vm_incoming
-	[[ -z $vm_migrate_to ]] || ln -fs $VM_BASE_DIR/$vm_migrate_to $vm_dir/vm_migrate_to
+	[[ -z $vm_incoming ]] || ln -fs $VM_DIR/$vm_incoming $vm_dir/vm_incoming
+	[[ -z $vm_migrate_to ]] || ln -fs $VM_DIR/$vm_migrate_to $vm_dir/vm_migrate_to
 }
 
 function vm_run()
@@ -854,7 +859,7 @@ function vm_run()
 		shift $((OPTIND-1))
 		for vm in $@; do
 			vm_num_is_valid $1 || return 1
-			if [[ ! -x $VM_BASE_DIR/$vm/run.sh ]]; then
+			if [[ ! -x $VM_DIR/$vm/run.sh ]]; then
 				error "VM$vm not defined - setup it first"
 				return 1
 			fi
@@ -864,12 +869,12 @@ function vm_run()
 
 	for vm in $vms_to_run; do
 		if vm_is_running $vm; then
-			warning "VM$vm ($VM_BASE_DIR/$vm) already running"
+			warning "VM$vm ($VM_DIR/$vm) already running"
 			continue
 		fi
 
-		notice "running $VM_BASE_DIR/$vm/run.sh"
-		if ! $VM_BASE_DIR/$vm/run.sh; then
+		notice "running $VM_DIR/$vm/run.sh"
+		if ! $VM_DIR/$vm/run.sh; then
 			error "FAILED to run vm $vm"
 			return 1
 		fi
@@ -881,22 +886,22 @@ function vm_print_logs()
 	vm_num=$1
 	warning "================"
 	warning "QEMU LOG:"
-	if [[ -r $VM_BASE_DIR/$vm_num/qemu.log ]]; then
-		cat $VM_BASE_DIR/$vm_num/qemu.log
+	if [[ -r $VM_DIR/$vm_num/qemu.log ]]; then
+		cat $VM_DIR/$vm_num/qemu.log
 	else
 		warning "LOG qemu.log not found"
 	fi
 
 	warning "VM LOG:"
-	if [[ -r $VM_BASE_DIR/$vm_num/serial.log ]]; then
-		cat $VM_BASE_DIR/$vm_num/serial.log
+	if [[ -r $VM_DIR/$vm_num/serial.log ]]; then
+		cat $VM_DIR/$vm_num/serial.log
 	else
 		warning "LOG serial.log not found"
 	fi
 
 	warning "SEABIOS LOG:"
-	if [[ -r $VM_BASE_DIR/$vm_num/seabios.log ]]; then
-		cat $VM_BASE_DIR/$vm_num/seabios.log
+	if [[ -r $VM_DIR/$vm_num/seabios.log ]]; then
+		cat $VM_DIR/$vm_num/seabios.log
 	else
 		warning "LOG seabios.log not found"
 	fi
@@ -920,11 +925,11 @@ function vm_wait_for_boot()
 	notice "Waiting for VMs to boot"
 	shift
 	if [[ "$@" == "" ]]; then
-		local vms_to_check="$VM_BASE_DIR/[0-9]*"
+		local vms_to_check="$VM_DIR/[0-9]*"
 	else
 		local vms_to_check=""
 		for vm in $@; do
-			vms_to_check+=" $VM_BASE_DIR/$vm"
+			vms_to_check+=" $VM_DIR/$vm"
 		done
 	fi
 
diff --git a/test/vhost/fiotest/fio.sh b/test/vhost/fiotest/fio.sh
index 0fafeca2c..2efe03faf 100755
--- a/test/vhost/fiotest/fio.sh
+++ b/test/vhost/fiotest/fio.sh
@@ -187,7 +187,7 @@ DISK=""
 
 fio_disks=""
 for vm_num in $used_vms; do
-	vm_dir=$VM_BASE_DIR/$vm_num
+	vm_dir=$VM_DIR/$vm_num
 
 	qemu_mask_param="VM_${vm_num}_qemu_mask"
 
@@ -213,7 +213,7 @@ if $dry_run; then
 	exit 0
 fi
 
-run_fio $fio_bin --job-file="$fio_job" --out="$TEST_DIR/fio_results" $fio_disks
+run_fio $fio_bin --job-file="$fio_job" --out="$VHOST_DIR/fio_results" $fio_disks
 
 if [[ "$test_type" == "spdk_vhost_scsi" ]]; then
 	for vm_num in $used_vms; do
diff --git a/test/vhost/hotplug/blk_hotremove.sh b/test/vhost/hotplug/blk_hotremove.sh
index 662ecb670..7dd4ad698 100644
--- a/test/vhost/hotplug/blk_hotremove.sh
+++ b/test/vhost/hotplug/blk_hotremove.sh
@@ -19,7 +19,7 @@ function prepare_fio_cmd_tc1() {
     run_fio="$fio_bin --eta=never "
     for vm_num in $1; do
         cp $fio_job $tmp_detach_job
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
         vm_check_blk_location $vm_num
         for disk in $SCSI_DISK; do
             echo "[nvme-host$disk]" >> $tmp_detach_job
diff --git a/test/vhost/hotplug/common.sh b/test/vhost/hotplug/common.sh
index 6bef109ee..d3d308617 100644
--- a/test/vhost/hotplug/common.sh
+++ b/test/vhost/hotplug/common.sh
@@ -113,7 +113,7 @@ function vms_setup_and_run() {
 
 function vms_prepare() {
     for vm_num in $1; do
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
 
         qemu_mask_param="VM_${vm_num}_qemu_mask"
 
diff --git a/test/vhost/hotplug/scsi_hotattach.sh b/test/vhost/hotplug/scsi_hotattach.sh
index d88b2e150..30ee89eb3 100755
--- a/test/vhost/hotplug/scsi_hotattach.sh
+++ b/test/vhost/hotplug/scsi_hotattach.sh
@@ -12,7 +12,7 @@ function prepare_fio_cmd_tc1() {
     run_fio="$fio_bin --eta=never "
     for vm_num in $1; do
         cp $fio_job $tmp_attach_job
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
         vm_check_scsi_location $vm_num
         for disk in $SCSI_DISK; do
             echo "[nvme-host$disk]" >> $tmp_attach_job
diff --git a/test/vhost/hotplug/scsi_hotdetach.sh b/test/vhost/hotplug/scsi_hotdetach.sh
index be3fab410..25ff86cb7 100755
--- a/test/vhost/hotplug/scsi_hotdetach.sh
+++ b/test/vhost/hotplug/scsi_hotdetach.sh
@@ -24,7 +24,7 @@ function prepare_fio_cmd_tc1_iter1() {
     run_fio="$fio_bin --eta=never "
     for vm_num in $1; do
         cp $fio_job $tmp_detach_job
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
         vm_check_scsi_location $vm_num
         for disk in $SCSI_DISK; do
             echo "[nvme-host$disk]" >> $tmp_detach_job
@@ -41,7 +41,7 @@ function prepare_fio_cmd_tc1_iter2() {
 
     for vm_num in 2; do
         cp $fio_job $tmp_detach_job
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
         vm_check_scsi_location $vm_num
         for disk in $SCSI_DISK; do
             echo "[nvme-host$disk]" >> $tmp_detach_job
@@ -66,7 +66,7 @@ function prepare_fio_cmd_tc2_iter1() {
     run_fio="$fio_bin --eta=never "
     for vm_num in $1; do
         cp $fio_job $tmp_detach_job
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
         vm_check_scsi_location $vm_num
         disk_array=($SCSI_DISK)
         disk=${disk_array[0]}
@@ -89,7 +89,7 @@ function prepare_fio_cmd_tc2_iter2() {
         else
             vm_job_name=default_integrity_4discs.job
         fi
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
         vm_check_scsi_location $vm_num
         for disk in $SCSI_DISK; do
             echo "[nvme-host$disk]" >> $tmp_detach_job
@@ -113,7 +113,7 @@ function prepare_fio_cmd_tc3_iter1() {
         else
             vm_job_name=default_integrity_4discs.job
         fi
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
         vm_check_scsi_location $vm_num
         j=1
         for disk in $SCSI_DISK; do
diff --git a/test/vhost/hotplug/scsi_hotremove.sh b/test/vhost/hotplug/scsi_hotremove.sh
index bc08c08f4..91b55037d 100644
--- a/test/vhost/hotplug/scsi_hotremove.sh
+++ b/test/vhost/hotplug/scsi_hotremove.sh
@@ -21,7 +21,7 @@ function prepare_fio_cmd_tc1() {
     run_fio="$fio_bin --eta=never "
     for vm_num in $1; do
         cp $fio_job $tmp_detach_job
-        vm_dir=$VM_BASE_DIR/$vm_num
+        vm_dir=$VM_DIR/$vm_num
         vm_check_scsi_location $vm_num
         for disk in $SCSI_DISK; do
             echo "[nvme-host$disk]" >> $tmp_detach_job
diff --git a/test/vhost/lvol/lvol_test.sh b/test/vhost/lvol/lvol_test.sh
index 082ae5f4b..bd8a4c747 100755
--- a/test/vhost/lvol/lvol_test.sh
+++ b/test/vhost/lvol/lvol_test.sh
@@ -226,7 +226,7 @@ vm_wait_for_boot 300 $used_vms
 
 fio_disks=""
 for vm_num in $used_vms; do
-    vm_dir=$VM_BASE_DIR/$vm_num
+    vm_dir=$VM_DIR/$vm_num
     qemu_mask_param="VM_${vm_num}_qemu_mask"
 
     host_name="VM-$vm_num-${!qemu_mask_param}"
@@ -248,7 +248,7 @@ else
     job_file="default_integrity.job"
 fi
 # Run FIO traffic
-run_fio $fio_bin --job-file=$rootdir/test/vhost/common/fio_jobs/$job_file --out="$TEST_DIR/fio_results" $fio_disks
+run_fio $fio_bin --job-file=$rootdir/test/vhost/common/fio_jobs/$job_file --out="$VHOST_DIR/fio_results" $fio_disks
 
 notice "Shutting down virtual machines..."
 vm_shutdown_all
diff --git a/test/vhost/migration/migration-tc2.sh b/test/vhost/migration/migration-tc2.sh
index 930cddf43..dc6f56952 100644
--- a/test/vhost/migration/migration-tc2.sh
+++ b/test/vhost/migration/migration-tc2.sh
@@ -69,7 +69,7 @@ function migration_tc2_configure_vhost()
 	timing_enter migration_tc2_configure_vhost
 
 	# Those are global intentionally - they will be unset in cleanup handler
-	nvmf_dir="$TEST_DIR/nvmf_tgt"
+	nvmf_dir="$VHOST_DIR/nvmf_tgt"
 
 	incoming_vm=1
 	target_vm=2
diff --git a/test/vhost/migration/migration-tc3b.sh b/test/vhost/migration/migration-tc3b.sh
index bfba9a428..26a76f066 100644
--- a/test/vhost/migration/migration-tc3b.sh
+++ b/test/vhost/migration/migration-tc3b.sh
@@ -8,7 +8,7 @@ incoming_vm=1
 target_vm=2
 target_vm_ctrl=naa.VhostScsi0.$target_vm
 rpc="$rootdir/scripts/rpc.py -s $(get_vhost_dir 1)/rpc.sock"
-share_dir=$TEST_DIR/share
+share_dir=$VHOST_DIR/share
 
 function host_2_cleanup_vhost()
 {
@@ -26,8 +26,8 @@ function host_2_cleanup_vhost()
 
 function host_2_start_vhost()
 {
-	echo "BASE DIR $TEST_DIR"
-	vhost_work_dir=$TEST_DIR/vhost1
+	echo "BASE DIR $VHOST_DIR"
+	vhost_work_dir=$VHOST_DIR/vhost1
 	mkdir -p $vhost_work_dir
 	rm -f $vhost_work_dir/*
 
@@ -49,7 +49,7 @@ function host_2_start_vhost()
 	echo "DONE" > $share_dir/DONE
 }
 
-echo $$ > $TEST_DIR/tc3b.pid
+echo $$ > $VHOST_DIR/tc3b.pid
 host_2_start_vhost
 suspend -f
 
diff --git a/test/vhost/migration/migration.sh b/test/vhost/migration/migration.sh
index 6d587809d..3b51ad4d6 100755
--- a/test/vhost/migration/migration.sh
+++ b/test/vhost/migration/migration.sh
@@ -66,7 +66,7 @@ function vm_monitor_send()
 {
 	local vm_num=$1
 	local cmd_result_file="$2"
-	local vm_dir="$VM_BASE_DIR/$1"
+	local vm_dir="$VM_DIR/$1"
 	local vm_monitor_port=$(cat $vm_dir/monitor_port)
 
 	[[ ! -z "$vm_monitor_port" ]] || fail "No monitor port!"
@@ -78,7 +78,7 @@ function vm_monitor_send()
 # Migrate VM $1
 function vm_migrate()
 {
-	local from_vm_dir="$VM_BASE_DIR/$1"
+	local from_vm_dir="$VM_DIR/$1"
 	local target_vm_dir="$(readlink -e $from_vm_dir/vm_migrate_to)"
 	local target_vm="$(basename $target_vm_dir)"
 	local target_vm_migration_port="$(cat $target_vm_dir/migration_port)"
diff --git a/test/vhost/other/negative.sh b/test/vhost/other/negative.sh
index af80888c5..b54cd86c4 100755
--- a/test/vhost/other/negative.sh
+++ b/test/vhost/other/negative.sh
@@ -43,10 +43,10 @@ notice "Testing vhost command line arguments"
 $VHOST_APP -c /path/to/non_existing_file/conf -S $testdir -e 0x0 -s 1024 -d -h --silence-noticelog
 
 # Testing vhost create pid file option. Vhost will exit with error as invalid config path is given
-if $VHOST_APP -c /path/to/non_existing_file/conf -f $TEST_DIR/vhost/vhost.pid; then
+if $VHOST_APP -c /path/to/non_existing_file/conf -f $VHOST_DIR/vhost/vhost.pid; then
 	fail "vhost started when specifying invalid config file"
 fi
-rm -f $TEST_DIR/vhost/vhost.pid
+rm -f $VHOST_DIR/vhost/vhost.pid
 
 # Testing vhost start with invalid config. Vhost will exit with error as bdev module init failed
 if $VHOST_APP -c $testdir/invalid.config; then
diff --git a/test/vhost/perf_bench/vhost_perf.sh b/test/vhost/perf_bench/vhost_perf.sh
index ad64d98fb..952d20212 100755
--- a/test/vhost/perf_bench/vhost_perf.sh
+++ b/test/vhost/perf_bench/vhost_perf.sh
@@ -322,7 +322,7 @@ fi
 # Run FIO
 fio_disks=""
 for vm_num in $used_vms; do
-	vm_dir=$VM_BASE_DIR/$vm_num
+	vm_dir=$VM_DIR/$vm_num
 	host_name="VM-$vm_num"
 	vm_exec $vm_num "hostname $host_name"
 	vm_start_fio_server $fio_bin $vm_num
@@ -350,12 +350,12 @@ fio_job_fname=$(basename $fio_job)
 fio_log_fname="${fio_job_fname%%.*}.log"
 for i in $(seq 1 $fio_iterations); do
 	echo "Running FIO iteration $i"
-	run_fio $fio_bin --job-file="$fio_job" --out="$TEST_DIR/fio_results" --json $fio_disks &
+	run_fio $fio_bin --job-file="$fio_job" --out="$VHOST_DIR/fio_results" --json $fio_disks &
 	fio_pid=$!
 
 	if $vm_sar_enable; then
 		sleep $vm_sar_delay
-		mkdir -p $TEST_DIR/fio_results/sar_stats
+		mkdir -p $VHOST_DIR/fio_results/sar_stats
 		pids=""
 		for vm_num in $used_vms; do
 			vm_exec "$vm_num" "mkdir -p /root/sar; sar -P ALL $vm_sar_interval $vm_sar_count >> /root/sar/sar_stats_VM${vm_num}_run${i}.txt" &
@@ -365,12 +365,12 @@ for i in $(seq 1 $fio_iterations); do
 			wait $j
 		done
 		for vm_num in $used_vms; do
-			vm_scp "$vm_num" "root@127.0.0.1:/root/sar/sar_stats_VM${vm_num}_run${i}.txt" "$TEST_DIR/fio_results/sar_stats"
+			vm_scp "$vm_num" "root@127.0.0.1:/root/sar/sar_stats_VM${vm_num}_run${i}.txt" "$VHOST_DIR/fio_results/sar_stats"
 		done
 	fi
 
 	wait $fio_pid
-	mv $TEST_DIR/fio_results/$fio_log_fname $TEST_DIR/fio_results/$fio_log_fname.$i
+	mv $VHOST_DIR/fio_results/$fio_log_fname $VHOST_DIR/fio_results/$fio_log_fname.$i
 	sleep 1
 done
 
diff --git a/test/vhost/readonly/readonly.sh b/test/vhost/readonly/readonly.sh
index 06760ceb6..d928f4db9 100755
--- a/test/vhost/readonly/readonly.sh
+++ b/test/vhost/readonly/readonly.sh
@@ -66,7 +66,7 @@ function blk_ro_tc1()
 	local vm_no="0"
 	local disk_name=$disk
 	local vhost_blk_name=""
-	local vm_dir="$TEST_DIR/vms/$vm_no"
+	local vm_dir="$VHOST_DIR/vms/$vm_no"
 
 	if [[ $disk =~ .*malloc.* ]]; then
 		disk_name=$($rpc_py construct_malloc_bdev 512 4096)