diff --git a/Makefile.am b/Makefile.am
index d8aaafd2..e5610344 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -142,6 +142,7 @@ EXTRA_DIST = \
 	test/test-par1.conf \
 	test/test-par2.conf \
 	test/test-par3.conf \
+	test/test-parz.conf \
 	test/test-par4.conf \
 	test/test-par5.conf \
 	test/test-par6.conf \
@@ -271,6 +272,7 @@ RENAME = $(srcdir)/test/test-par6-rename.conf
 PAR1 = $(srcdir)/test/test-par1.conf
 PAR2 = $(srcdir)/test/test-par2.conf
 PAR3 = $(srcdir)/test/test-par3.conf
+PARZ = $(srcdir)/test/test-parz.conf
 PAR4 = $(srcdir)/test/test-par4.conf
 PAR5 = $(srcdir)/test/test-par5.conf
 PAR6 = $(srcdir)/test/test-par6.conf
@@ -563,8 +565,10 @@ endif
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(CONF) status
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) --test-io-advise-none -c $(PAR1) sync -F --test-io-cache 1
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) --test-io-advise-sequential -c $(PAR1) sync -F --test-io-stats
+	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) --test-io-advise-flush -c $(PAR1) sync -F --test-io-cache 1
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) --test-io-advise-flush-window -c $(PAR1) sync -F
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) --test-io-advise-discard-window -c $(PAR1) sync -F
+	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) --test-io-advise-direct -c $(PAR1) sync -F
 #### CHANGE LINKS ####
 # Use a different size ("22" instead of "1") to ensure to recognize the file different
 # even if it gets the same timestamp in case subsecond timestamp is no available
@@ -776,6 +780,12 @@ endif
 	mv bench/disk4/a/7* bench/disk4/b/
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(CONF) sync
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(CONF) check
+#### SNAPRAIDIGNORE
+	echo "a*" > bench/disk1/a/.snapraidignore
+	echo "b*" > bench/disk1/.snapraidignore
+	echo "c/" > bench/disk1/.snapraidignore
+	echo "/d/" > bench/disk1/.snapraidignore
+	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(CONF) sync
 if !HAVE_MEMORY_CHECKER
 #### RECOVER 1 ####
 	$(MSG) Delete one disk, fix and check with PAR1
@@ -809,6 +819,20 @@ if !HAVE_MEMORY_CHECKER
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(PAR3) fix -l test.log
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(CONF) check
 	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(CONF) sync
+#### RECOVER Z ####
+	$(MSG) Compute PARZ - keeping PAR1 and PAR2 as they are
+	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(PARZ) fix -d 3-parity -l test.log
+	$(MSG) Delete three disks, fix and check with PARZ
+	rm -r bench/disk3
+	mkdir bench/disk3
+	rm -r bench/disk4
+	mkdir bench/disk4
+	rm -r bench/disk5
+	mkdir bench/disk5
+	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) --test-expect-recoverable -c $(PARZ) check -l test.log
+	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(PARZ) fix -l test.log
+	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(CONF) check
+	$(TESTENV) ./snapraid$(EXEEXT) $(CHECKFLAGS) -c $(CONF) sync
 #### RECOVER 4 ####
 	$(MSG) Delete four disks, fix and check with PAR4
 	rm -r bench/disk3
diff --git a/TODO b/TODO
index 970b2e2b..b2bc6023 100644
--- a/TODO
+++ b/TODO
@@ -7,6 +7,8 @@ This is the list of TODO items for SnapRAID.
 
 * Integration with MergeFS ?
 
+* Evaluate use of syscall getdents64() instead of readdir(): https://linux.die.net/man/2/getdents64
+
 * Check Reliability Test 
 https://github.com/linuxhw/SMART
 https://github.com/linuxhw/EnterpriseDrive
diff --git a/cmdline/snapraid.c b/cmdline/snapraid.c
index b9c8ae4e..b7a5255a 100644
--- a/cmdline/snapraid.c
+++ b/cmdline/snapraid.c
@@ -101,10 +101,12 @@ void test(int argc, char* argv[])
 	int i;
 	char buffer[ESC_MAX];
 
-	/* special testing code for quoting */
+	/* special testing code */
 	if (argc < 2 || strcmp(argv[1], "test") != 0)
 		return;
 
+	lock_init();
+
 	assert(strcmp(strpolish(strcpy(buffer, "\r \n\xFF")), "    ") == 0);
 	assert(strcmp(strtrim(strcpy(buffer, " trim trim \n\r")), "trim trim") == 0);
 	assert(strcmp(strlwr(strcpy(buffer, " LoWer\n\r")), " lower\n\r") == 0);
@@ -486,8 +488,14 @@ void test(int argc, char* argv[])
 	assert(strcmp(esc_shell("test_2024-01-01.log", buffer), "test_2024-01-01.log") == 0);
 #endif
 
+	random_seed(0);
+	assert(random_u8() == 0xAF);
+	assert(random_u64() == 0x6E789E6AA1B965F4ULL);
+
 	printf("Everything OK\n");
 
+	lock_done();
+
 	exit(EXIT_SUCCESS);
 }
 
diff --git a/cmdline/state.c b/cmdline/state.c
index 9a3557a9..79e612e7 100644
--- a/cmdline/state.c
+++ b/cmdline/state.c
@@ -1655,7 +1655,7 @@ static void state_map(struct snapraid_state* state)
 
 	/* recommend number of parities */
 	if (!state->opt.no_warnings) {
-		/* intentionally use log_fatal() instead of log_error() to give more visibility at the warning */
+		/* LCOV_EXCL_START */
 		if (diskcount >= 36 && state->level < 6) {
 			log_error(EUSER, "WARNING! For %u disks, it's recommended to use six parity levels.\n", diskcount);
 		} else if (diskcount >= 29 && state->level < 5) {
@@ -1667,6 +1667,7 @@ static void state_map(struct snapraid_state* state)
 		} else if (diskcount >= 5 && state->level < 2) {
 			log_error(EUSER, "WARNING! For %u disks, it's recommended to use two parity levels.\n", diskcount);
 		}
+		/* LCOV_EXCL_STOP */
 	}
 }
 
diff --git a/cmdline/support.c b/cmdline/support.c
index 205d358e..f61e39ee 100644
--- a/cmdline/support.c
+++ b/cmdline/support.c
@@ -98,6 +98,11 @@ void lock_done(void)
 
 static uint64_t random_state = 1;
 
+void random_seed(uint64_t seed)
+{
+	random_state = seed;
+}
+
 void random_reseed(void)
 {
 	random_state = tick();
@@ -138,6 +143,7 @@ uint64_t random_u64(void)
 
 int is_hw(int err)
 {
+	/* LCOV_EXCL_START */
 	if (err == EIO)
 		return 1;
 #ifdef EFSCORRUPTED
@@ -164,11 +170,13 @@ int is_hw(int err)
 	if (err == EHWPOISON) /* hardware memory error */
 		return 1;
 #endif
+	/* LCOV_EXCL_STOP */
 	return 0;
 }
 
 void log_fatal_errno(int err, const char* name)
 {
+	/* LCOV_EXCL_START */
 	if (err == EIO) {
 		log_fatal(err, "DANGER! Unexpected input/output error in disk %s. It isn't possible to continue.\n", name);
 #ifdef EFSCORRUPTED
@@ -202,10 +210,12 @@ void log_fatal_errno(int err, const char* name)
 	} else {
 		log_fatal(err, "WARNING! Without a working %s disk, it isn't possible to continue.\n", name);
 	}
+	/* LCOV_EXCL_STOP */
 }
 
 void log_error_errno(int err, const char* name)
 {
+	/* LCOV_EXCL_START */
 	if (err == EIO) {
 		log_fatal(err, "DANGER! Unexpected input/output error in disk %s.\n", name);
 #ifdef EFSCORRUPTED
@@ -232,6 +242,7 @@ void log_error_errno(int err, const char* name)
 	} else if (err == EHWPOISON) {
 		log_fatal(err, "DANGER! Unexpected memory error in disk %s.\n", name);
 #endif
+		/* LCOV_EXCL_STOP */
 	} else if (err == EACCES) {
 		log_error(err, "WARNING! Grant permission in the disk %s.\n", name);
 	} else if (err == ENOSPC) {
diff --git a/cmdline/support.h b/cmdline/support.h
index 624ae789..69fb90bd 100644
--- a/cmdline/support.h
+++ b/cmdline/support.h
@@ -56,7 +56,12 @@ void unlock_memory(void);
 /* random */
 
 /**
- * Reseed the random pseudo random number generator
+ * Seed the random pseudo random number generator
+ */
+void random_seed(uint64_t seed);
+
+/**
+ * Reseed the random pseudo random number generator with the tick count
  */
 void random_reseed(void);
 
diff --git a/cmdline/util.c b/cmdline/util.c
index 2395390c..860b3368 100644
--- a/cmdline/util.c
+++ b/cmdline/util.c
@@ -764,6 +764,7 @@ const char* hash_config_name(unsigned kind)
 	case HASH_MURMUR3 : return "murmur3";
 	case HASH_SPOOKY2 : return "spooky2";
 	case HASH_METRO : return "metro";
+	case HASH_MUSEAIR : return "museair";
 	default :
 		/* LCOV_EXCL_START */
 		return "unknown";
diff --git a/makecov.sh b/makecov.sh
index 4a0bbd99..eded9147 100755
--- a/makecov.sh
+++ b/makecov.sh
@@ -9,8 +9,22 @@ if ! ./configure --enable-coverage --enable-sde; then
 	exit 1
 fi
 
-if ! make lcov_reset check lcov_capture lcov_html; then
+if ! make lcov_reset; then
 	exit 1
 fi
 
+if ! make check; then
+	exit 1
+fi
 
+# Run commands on a real array to test smartctl
+sudo ./snapraid probe
+sudo ./snapraid up
+sudo ./snapraid smart
+sudo ./snapraid probe
+sudo ./snapraid devices
+sudo ./snapraid down
+
+if ! make lcov_capture lcov_html; then
+	exit 1
+fi
diff --git a/test/test-par1.conf b/test/test-par1.conf
index 3b9bf8eb..a13c8d61 100644
--- a/test/test-par1.conf
+++ b/test/test-par1.conf
@@ -1,4 +1,5 @@
 # Test configuration file
+hashsize 16
 blocksize 1
 parity bench/parity.0,bench/parity.1,bench/parity.2,bench/parity.3
 content bench/content
diff --git a/test/test-parz.conf b/test/test-parz.conf
new file mode 100644
index 00000000..0f8db9cf
--- /dev/null
+++ b/test/test-parz.conf
@@ -0,0 +1,17 @@
+blocksize 1
+parity bench/parity.0,bench/parity.1,bench/parity.2,bench/parity.3
+2-parity bench/2-parity.0,bench/2-parity.1,bench/2-parity.2,bench/2-parity.3
+z-parity bench/z-parity.0,bench/z-parity.1,bench/z-parity.2,bench/z-parity.3
+content bench/content
+content bench/1-content
+content bench/2-content
+content bench/3-content
+disk disk1 bench/disk1/
+disk disk2 bench/disk2/
+disk disk3 bench/disk3/
+disk disk4 bench/disk4/
+disk disk5 bench/disk5/
+disk disk6 bench/disk6/
+include *.hidden
+exclude *.unrecoverable
+