diff mbox series

[blktests,v1,17/18] nvme: don't assume namespace id

Message ID 20240321094727.6503-18-dwagner@suse.de (mailing list archive)
State New, archived
Headers show
Series refactoring and various cleanups/fixes | expand

Commit Message

Daniel Wagner March 21, 2024, 9:47 a.m. UTC 
The tests assume that the namespace id is always 1. This might not be
correct in future (e.g. running real targets), thus harden the test by
using the uuid to lookup the correct namespace id.

The passthru test already do this, so it makes also sense to update the
other tests as well.

Signed-off-by: Daniel Wagner <dwagner@suse.de>
---
 tests/nvme/010 |  7 +++----
 tests/nvme/011 |  7 +++----
 tests/nvme/012 |  7 +++----
 tests/nvme/013 |  7 +++----
 tests/nvme/014 | 13 ++++++-------
 tests/nvme/015 | 13 ++++++-------
 tests/nvme/018 | 15 +++++++--------
 tests/nvme/019 |  8 +++-----
 tests/nvme/020 |  7 +++----
 tests/nvme/021 |  7 +++----
 tests/nvme/023 |  8 +++-----
 tests/nvme/024 |  9 ++++-----
 tests/nvme/025 |  7 +++----
 tests/nvme/026 |  8 +++-----
 tests/nvme/029 |  6 +-----
 tests/nvme/040 |  4 +++-
 tests/nvme/045 |  5 +++--
 tests/nvme/047 | 10 +++++-----
 tests/nvme/rc  | 18 ++++++++++++++++++
 19 files changed, 83 insertions(+), 83 deletions(-)

Comments

Daniel Wagner March 21, 2024, 10:19 a.m. UTC | #1 
On Thu, Mar 21, 2024 at 10:47:26AM +0100, Daniel Wagner wrote:
 --- a/tests/nvme/029
> +++ b/tests/nvme/029
> @@ -53,16 +53,12 @@ test() {
>  
>  	_setup_nvmet
>  
> -	local nvmedev
>  	local reset_nr_hugepages=false
>  
>  	_nvmet_target_setup
>  
>  	_nvme_connect_subsys
>  
> -	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
> -	_check_uuid "${nvmedev}"
> -
>  	# nvme-cli may fail to allocate linear memory for rather large IO buffers.
>  	# Increase nr_hugepages to allow nvme-cli to try the linear memory allocation
>  	# from HugeTLB pool.
> @@ -72,7 +68,7 @@ test() {
>  		reset_nr_hugepages=true
>  	fi
>  
> -	local dev="/dev/${nvmedev}n1"
> +	local dev="/dev/$(_find_nvme_ns "${def_subsys_uuid}")"

make check complains here, the declaration and assignment should be a
separate step. I've fixed this up

> +_find_nvme_ns() {
> +	local subsys_uuid=$1
> +	local uuid
> +	local ns
> +
> +	for ns in "/sys/block/nvme"* ; do
> +		# ignore nvme channel block devices
> +		if ! [[ "${ns}" =~ nvme[0-9]+n[0-9]+ ]]; then
> +			continue
> +		fi
> +		[ -e "${ns}/uuid" ] || continue
> +		uuid=$(cat "${ns}/uuid")
> +		if [[ "${subsys_uuid}" == "${uuid}" ]]; then
> +			echo "$(basename ${ns})"

The echo is not necessary, I've dropped it.
Shin'ichiro Kawasaki March 22, 2024, 9:35 a.m. UTC | #2 
On Mar 21, 2024 / 10:47, Daniel Wagner wrote:
> The tests assume that the namespace id is always 1. This might not be
> correct in future (e.g. running real targets), thus harden the test by
> using the uuid to lookup the correct namespace id.
> 
> The passthru test already do this, so it makes also sense to update the
> other tests as well.
> 
> Signed-off-by: Daniel Wagner <dwagner@suse.de>
> ---
>  tests/nvme/010 |  7 +++----
>  tests/nvme/011 |  7 +++----
>  tests/nvme/012 |  7 +++----
>  tests/nvme/013 |  7 +++----
>  tests/nvme/014 | 13 ++++++-------
>  tests/nvme/015 | 13 ++++++-------
>  tests/nvme/018 | 15 +++++++--------
>  tests/nvme/019 |  8 +++-----
>  tests/nvme/020 |  7 +++----
>  tests/nvme/021 |  7 +++----
>  tests/nvme/023 |  8 +++-----
>  tests/nvme/024 |  9 ++++-----
>  tests/nvme/025 |  7 +++----
>  tests/nvme/026 |  8 +++-----
>  tests/nvme/029 |  6 +-----
>  tests/nvme/040 |  4 +++-
>  tests/nvme/045 |  5 +++--
>  tests/nvme/047 | 10 +++++-----
>  tests/nvme/rc  | 18 ++++++++++++++++++
>  19 files changed, 83 insertions(+), 83 deletions(-)
> 
> diff --git a/tests/nvme/010 b/tests/nvme/010
> index 7d875989a01c..6feb39153e99 100755
> --- a/tests/nvme/010
> +++ b/tests/nvme/010
> @@ -20,17 +20,16 @@ test() {
>  
>  	_setup_nvmet
>  
> -	local nvmedev
> +	local ns
>  
>  	_nvmet_target_setup
>  
>  	_nvme_connect_subsys
>  
> -	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
> -	_check_uuid "${nvmedev}"
> +	ns=$(_find_nvme_ns "${def_subsys_uuid}")

Currently, _check_uuid() compares the uuid with wwid. On the other hand, the
modified _find_nvme_ns() does not refer wwid. This looks a relax of test
condition. Do you think this relax is fine?

>  
>  	_run_fio_verify_io --size="${nvme_img_size}" \
> -		--filename="/dev/${nvmedev}n1"
> +		--filename="/dev/${ns}"
>  
>  	_nvme_disconnect_subsys
>

[...]

> diff --git a/tests/nvme/047 b/tests/nvme/047
> index 7a2432a769e5..9bbe84d4f145 100755
> --- a/tests/nvme/047
> +++ b/tests/nvme/047
> @@ -22,7 +22,7 @@ test() {
>  
>  	_setup_nvmet
>  
> -	local nvmedev
> +	local ns
>  	local rand_io_size
>  
>  	_nvmet_target_setup
> @@ -30,18 +30,18 @@ test() {
>  	_nvme_connect_subsys \
>  		--nr-write-queues 1 || echo FAIL
>  
> -	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
> +	ns=$(_find_nvme_ns "${def_subsys_uuid}")
>  
>  	rand_io_size="$(_nvme_calc_rand_io_size 4M)"
> -	_run_fio_rand_io --filename="/dev/${nvmedev}n1" --size="${rand_io_size}"
> +	_run_fio_rand_io --filename="/dev/${ns}" --size="${rand_io_size}"
>  
> -	_nvme_disconnect_subsys "${def_subsysnqn}" >> "$FULL" 2>&1
> +	_nvme_disconnect_subsys >> "$FULL" 2>&1

This change above looks different from the purpose of this patch. It should move
to one of the previous patches, probably.
Daniel Wagner March 22, 2024, 12:34 p.m. UTC | #3 
On Fri, Mar 22, 2024 at 09:35:05AM +0000, Shinichiro Kawasaki wrote:
 > --- a/tests/nvme/010
> > +++ b/tests/nvme/010
> > @@ -20,17 +20,16 @@ test() {
> >  
> >  	_setup_nvmet
> >  
> > -	local nvmedev
> > +	local ns
> >  
> >  	_nvmet_target_setup
> >  
> >  	_nvme_connect_subsys
> >  
> > -	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
> > -	_check_uuid "${nvmedev}"
> > +	ns=$(_find_nvme_ns "${def_subsys_uuid}")
> 
> Currently, _check_uuid() compares the uuid with wwid. On the other hand, the
> modified _find_nvme_ns() does not refer wwid. This looks a relax of test
> condition. Do you think this relax is fine?

We still have the _check_uuid in nvme/008 and nvme/009, so while drop
this part here it is still tested. I think we should try to make the
tests as slim as possible, which includes the removal duplicate tests
snippets. I think it is important to keep an eye on the runtime of each
test.
diff mbox series

Patch

diff --git a/tests/nvme/010 b/tests/nvme/010
index 7d875989a01c..6feb39153e99 100755
--- a/tests/nvme/010
+++ b/tests/nvme/010
@@ -20,17 +20,16 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
 	_run_fio_verify_io --size="${nvme_img_size}" \
-		--filename="/dev/${nvmedev}n1"
+		--filename="/dev/${ns}"
 
 	_nvme_disconnect_subsys
 
diff --git a/tests/nvme/011 b/tests/nvme/011
index 0acc8b1dbaed..eee044cbb4f8 100755
--- a/tests/nvme/011
+++ b/tests/nvme/011
@@ -20,17 +20,16 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup --blkdev file
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
 	_run_fio_verify_io --size="${nvme_img_size}" \
-		--filename="/dev/${nvmedev}n1"
+		--filename="$/dev/{ns}"
 
 	_nvme_disconnect_subsys
 
diff --git a/tests/nvme/012 b/tests/nvme/012
index a0bff298ab29..64cb6ecf0191 100755
--- a/tests/nvme/012
+++ b/tests/nvme/012
@@ -24,16 +24,15 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	if ! _xfs_run_fio_verify_io "/dev/${nvmedev}n1"; then
+	if ! _xfs_run_fio_verify_io "/dev/${ns}"; then
 		echo "FAIL: fio verify failed"
 	fi
 
diff --git a/tests/nvme/013 b/tests/nvme/013
index 5e5026eabe17..68d07cbc4afa 100755
--- a/tests/nvme/013
+++ b/tests/nvme/013
@@ -23,16 +23,15 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup --blkdev file
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	if ! _xfs_run_fio_verify_io "/dev/${nvmedev}n1"; then
+	if ! _xfs_run_fio_verify_io "$/dev/{ns}"; then
 		echo "FAIL: fio verify failed"
 	fi
 
diff --git a/tests/nvme/014 b/tests/nvme/014
index da4b4c13b347..e56e3212cf28 100755
--- a/tests/nvme/014
+++ b/tests/nvme/014
@@ -20,7 +20,7 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 	local size
 	local bs
 	local count
@@ -29,17 +29,16 @@  test() {
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	size="$(blockdev --getsize64 "/dev/${nvmedev}n1")"
-	bs="$(blockdev --getbsz "/dev/${nvmedev}n1")"
+	size="$(blockdev --getsize64 "/dev/${ns}")"
+	bs="$(blockdev --getbsz "/dev/${ns}")"
 	count=$((size / bs))
 
-	dd if=/dev/urandom of="/dev/${nvmedev}n1" \
+	dd if=/dev/urandom of="$/dev/{ns}" \
 		count="${count}" bs="${bs}" status=none
 
-	nvme flush "/dev/${nvmedev}" --namespace-id 1
+	nvme flush "/dev/${ns}"
 
 	_nvme_disconnect_subsys
 
diff --git a/tests/nvme/015 b/tests/nvme/015
index b82f2253c011..f0621dab681b 100755
--- a/tests/nvme/015
+++ b/tests/nvme/015
@@ -20,7 +20,7 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 	local size
 	local bs
 	local count
@@ -29,17 +29,16 @@  test() {
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	size="$(blockdev --getsize64 "/dev/${nvmedev}n1")"
-	bs="$(blockdev --getbsz "/dev/${nvmedev}n1")"
+	size="$(blockdev --getsize64 "/dev/${ns}")"
+	bs="$(blockdev --getbsz "/dev/${ns}")"
 	count=$((size / bs))
 
-	dd if=/dev/urandom of="/dev/${nvmedev}n1" \
+	dd if=/dev/urandom of="/dev/${ns}" \
 		count="${count}" bs="${bs}" status=none
 
-	nvme flush "/dev/${nvmedev}n1" --namespace-id 1
+	nvme flush "/dev/${ns}"
 
 	_nvme_disconnect_subsys
 
diff --git a/tests/nvme/018 b/tests/nvme/018
index bd6e5e930e35..b8c16354a01b 100755
--- a/tests/nvme/018
+++ b/tests/nvme/018
@@ -21,21 +21,20 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
+	local sectors
+	local bs
 
 	_nvmet_target_setup --blkdev file
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	local sectors
-	local bs
-	sectors="$(blockdev --getsz "/dev/${nvmedev}n1")"
-	bs="$(blockdev --getbsz "/dev/${nvmedev}n1")"
+	sectors="$(blockdev --getsz "/dev/${ns}")"
+	bs="$(blockdev --getbsz "/dev/${ns}")"
 
-	nvme read "/dev/${nvmedev}n1" --start-block "$sectors" \
+	nvme read "/dev/${ns}" --start-block "$sectors" \
 		--block-count 0 --data-size "$bs" &>"$FULL" \
 		&& echo "ERROR: nvme read for out of range LBA was not rejected"
 
diff --git a/tests/nvme/019 b/tests/nvme/019
index 4d7de8191da7..1cd5378e9dd4 100755
--- a/tests/nvme/019
+++ b/tests/nvme/019
@@ -20,7 +20,7 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 	local nblk_range="10,10,10,10,10,10,10,10,10,10"
 	local sblk_range="100,200,300,400,500,600,700,800,900,1000"
 
@@ -28,10 +28,8 @@  test() {
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
-
-	nvme dsm "/dev/${nvmedev}" --namespace-id 1 --ad \
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
+	nvme dsm "/dev/${ns}" --ad \
 		--slbs "${sblk_range}" --blocks "${nblk_range}"
 
 	_nvme_disconnect_subsys
diff --git a/tests/nvme/020 b/tests/nvme/020
index c734210c5bd9..0364c4e0dd4f 100755
--- a/tests/nvme/020
+++ b/tests/nvme/020
@@ -19,7 +19,7 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 	local nblk_range="10,10,10,10,10,10,10,10,10,10"
 	local sblk_range="100,200,300,400,500,600,700,800,900,1000"
 
@@ -27,10 +27,9 @@  test() {
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	nvme dsm "/dev/${nvmedev}" --namespace-id 1 --ad \
+	nvme dsm "/dev/${ns}" --ad \
 		--slbs "${sblk_range}" --blocks "${nblk_range}"
 
 	_nvme_disconnect_subsys
diff --git a/tests/nvme/021 b/tests/nvme/021
index 358e209d0458..7ee1f078cd60 100755
--- a/tests/nvme/021
+++ b/tests/nvme/021
@@ -20,16 +20,15 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup --blkdev file
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	if ! nvme list 2>> "$FULL" | grep -q "${nvmedev}n1"; then
+	if ! nvme list 2>> "$FULL" | grep -q "/dev/${ns}"; then
 		echo "ERROR: device not listed"
 	fi
 
diff --git a/tests/nvme/023 b/tests/nvme/023
index abbb35a0b580..d8f17ae7a8ea 100755
--- a/tests/nvme/023
+++ b/tests/nvme/023
@@ -20,17 +20,15 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	if ! nvme smart-log "/dev/${nvmedev}" --namespace-id 1 \
-		>> "$FULL" 2>&1; then
+	if ! nvme smart-log "/dev/${ns}" >> "$FULL" 2>&1; then
 		echo "ERROR: smart-log bdev-ns failed"
 	fi
 
diff --git a/tests/nvme/024 b/tests/nvme/024
index 3ee18822e26b..a5121940a543 100755
--- a/tests/nvme/024
+++ b/tests/nvme/024
@@ -20,19 +20,18 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup --blkdev file
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns ${def_subsys_uuid})
 
-	if ! nvme smart-log "/dev/${nvmedev}" --namespace-id 1 \
-		>> "$FULL" 2>&1; then
+	if ! nvme smart-log "/dev/${ns}" >> "$FULL" 2>&1; then
 		echo "ERROR: smart-log file-ns failed"
 	fi
+
 	_nvme_disconnect_subsys >> "$FULL" 2>&1
 
 	_nvmet_target_cleanup
diff --git a/tests/nvme/025 b/tests/nvme/025
index 3cd62d0b4e5e..3f9a615e542e 100755
--- a/tests/nvme/025
+++ b/tests/nvme/025
@@ -20,16 +20,15 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup --blkdev file
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	if ! nvme effects-log "/dev/${nvmedev}" >> "$FULL" 2>&1; then
+	if ! nvme effects-log "/dev/${ns}" >> "$FULL" 2>&1; then
 		echo "ERROR: effects-log failed"
 	fi
 
diff --git a/tests/nvme/026 b/tests/nvme/026
index 5d54b0ff3d28..28fd151d9a77 100755
--- a/tests/nvme/026
+++ b/tests/nvme/026
@@ -20,17 +20,15 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 
 	_nvmet_target_setup --blkdev file
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	if ! nvme ns-descs "/dev/${nvmedev}" --namespace-id 1 \
-		>> "$FULL" 2>&1; then
+	if ! nvme ns-descs "/dev/${ns}" >> "$FULL" 2>&1; then
 		echo "ERROR: ns-desc failed"
 	fi
 
diff --git a/tests/nvme/029 b/tests/nvme/029
index 8dbe49ba15cc..f3c79bf0451c 100755
--- a/tests/nvme/029
+++ b/tests/nvme/029
@@ -53,16 +53,12 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
 	local reset_nr_hugepages=false
 
 	_nvmet_target_setup
 
 	_nvme_connect_subsys
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
-	_check_uuid "${nvmedev}"
-
 	# nvme-cli may fail to allocate linear memory for rather large IO buffers.
 	# Increase nr_hugepages to allow nvme-cli to try the linear memory allocation
 	# from HugeTLB pool.
@@ -72,7 +68,7 @@  test() {
 		reset_nr_hugepages=true
 	fi
 
-	local dev="/dev/${nvmedev}n1"
+	local dev="/dev/$(_find_nvme_ns "${def_subsys_uuid}")"
 	test_user_io "$dev" 1 512 > "$FULL" 2>&1 || echo FAIL
 	test_user_io "$dev" 1 511 > "$FULL" 2>&1 || echo FAIL
 	test_user_io "$dev" 1 513 > "$FULL" 2>&1 || echo FAIL
diff --git a/tests/nvme/040 b/tests/nvme/040
index f00fc16b643f..bb9ed5ef57e9 100755
--- a/tests/nvme/040
+++ b/tests/nvme/040
@@ -23,15 +23,17 @@  test() {
 
 	local nvmedev
 	local fio_pid
+	local ns
 
 	_nvmet_target_setup
 
 	_nvme_connect_subsys
 	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
 	# start fio job
 	echo "starting background fio"
-	_run_fio_rand_io --filename="/dev/${nvmedev}n1" \
+	_run_fio_rand_io --filename="/dev/${ns}" \
 		--group_reporting --ramp_time=5 \
 		--time_based --runtime=1d &> /dev/null &
 	fio_pid=$!
diff --git a/tests/nvme/045 b/tests/nvme/045
index adc86b89ccc5..5c074be7e3a8 100755
--- a/tests/nvme/045
+++ b/tests/nvme/045
@@ -33,6 +33,7 @@  test() {
 	local new_ctrlkey
 	local ctrldev
 	local rand_io_size
+	local ns
 
 	hostkey="$(nvme gen-dhchap-key -n ${def_subsysnqn} 2> /dev/null)"
 	if [ -z "$hostkey" ] ; then
@@ -100,10 +101,10 @@  test() {
 
 	echo "${new_hostkey}" > "${hostkey_file}"
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
 	rand_io_size="$(_nvme_calc_rand_io_size 4m)"
-	_run_fio_rand_io --size="${rand_io_size}" --filename="/dev/${nvmedev}n1"
+	_run_fio_rand_io --size="${rand_io_size}" --filename="/dev/${ns}"
 
 	_nvme_disconnect_subsys "${subsysnqn}"
 	_nvmet_target_cleanup
diff --git a/tests/nvme/047 b/tests/nvme/047
index 7a2432a769e5..9bbe84d4f145 100755
--- a/tests/nvme/047
+++ b/tests/nvme/047
@@ -22,7 +22,7 @@  test() {
 
 	_setup_nvmet
 
-	local nvmedev
+	local ns
 	local rand_io_size
 
 	_nvmet_target_setup
@@ -30,18 +30,18 @@  test() {
 	_nvme_connect_subsys \
 		--nr-write-queues 1 || echo FAIL
 
-	nvmedev=$(_find_nvme_dev "${def_subsysnqn}")
+	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
 	rand_io_size="$(_nvme_calc_rand_io_size 4M)"
-	_run_fio_rand_io --filename="/dev/${nvmedev}n1" --size="${rand_io_size}"
+	_run_fio_rand_io --filename="/dev/${ns}" --size="${rand_io_size}"
 
-	_nvme_disconnect_subsys "${def_subsysnqn}" >> "$FULL" 2>&1
+	_nvme_disconnect_subsys >> "$FULL" 2>&1
 
 	_nvme_connect_subsys \
 		--nr-write-queues 1 \
 		--nr-poll-queues 1 || echo FAIL
 
-	_run_fio_rand_io --filename="/dev/${nvmedev}n1" --size="${rand_io_size}"
+	_run_fio_rand_io --filename="/dev/${ns}" --size="${rand_io_size}"
 
 	_nvme_disconnect_subsys >> "$FULL" 2>&1
 
diff --git a/tests/nvme/rc b/tests/nvme/rc
index 214744edf44e..e7a59093a867 100644
--- a/tests/nvme/rc
+++ b/tests/nvme/rc
@@ -797,6 +797,24 @@  _find_nvme_dev() {
 	done
 }
 
+_find_nvme_ns() {
+	local subsys_uuid=$1
+	local uuid
+	local ns
+
+	for ns in "/sys/block/nvme"* ; do
+		# ignore nvme channel block devices
+		if ! [[ "${ns}" =~ nvme[0-9]+n[0-9]+ ]]; then
+			continue
+		fi
+		[ -e "${ns}/uuid" ] || continue
+		uuid=$(cat "${ns}/uuid")
+		if [[ "${subsys_uuid}" == "${uuid}" ]]; then
+			echo "$(basename ${ns})"
+		fi
+	done
+}
+
 _find_nvme_passthru_loop_dev() {
 	local subsys=$1
 	local nsid