diff --git a/test/ftl/config/fio/randw-verify-depth128.fio.in b/test/ftl/config/fio/randw-verify-depth128.fio.in
index 442aa991c..ca3b3fb74 100644
--- a/test/ftl/config/fio/randw-verify-depth128.fio.in
+++ b/test/ftl/config/fio/randw-verify-depth128.fio.in
@@ -14,7 +14,7 @@ bs=4k
 filename=FTL_BDEV_NAME
 random_distribution=normal
 serialize_overlap=1
-io_size=5G
+io_size=256M
 
 [test]
 numjobs=1
diff --git a/test/ftl/config/fio/randw-verify-j2.fio.in b/test/ftl/config/fio/randw-verify-j2.fio.in
index 58cdd48cc..851f42d36 100644
--- a/test/ftl/config/fio/randw-verify-j2.fio.in
+++ b/test/ftl/config/fio/randw-verify-j2.fio.in
@@ -15,7 +15,7 @@ bs=4k
 filename=FTL_BDEV_NAME
 random_distribution=normal
 serialize_overlap=1
-io_size=1G
+io_size=256M
 
 [first_half]
 offset=0%
diff --git a/test/ftl/config/fio/randw-verify.fio.in b/test/ftl/config/fio/randw-verify.fio.in
index 8663de906..5a7dafe04 100644
--- a/test/ftl/config/fio/randw-verify.fio.in
+++ b/test/ftl/config/fio/randw-verify.fio.in
@@ -5,7 +5,7 @@ thread=1
 direct=1
 iodepth=1
 rw=randwrite
-size=4G
+size=256M
 verify=crc32c
 do_verify=1
 verify_dump=0