zpool status -k shows kind of vdevs: ssd, hdd or mixed.

cmd/zpool/zpool_main.c

@@ -340,7 +340,7 @@ get_usage(zpool_help_t idx) {
 	case HELP_SCRUB:
 		return (gettext("\tscrub [-s] <pool> ...\n"));
 	case HELP_STATUS:
-		return (gettext("\tstatus [-gLPvxD] [-T d|u] [pool] ... "
+		return (gettext("\tstatus [-gkLPvxD] [-T d|u] [pool] ... "
 		    "[interval [count]]\n"));
 	case HELP_UPGRADE:
 		return (gettext("\tupgrade\n"
@@ -1538,6 +1538,7 @@ typedef struct status_cbdata {
 	boolean_t	cb_explain;
 	boolean_t	cb_first;
 	boolean_t	cb_dedup_stats;
+	boolean_t	cb_kind;
 	boolean_t	cb_print_status;
 	vdev_cmd_data_list_t	*vcdl;
 } status_cbdata_t;
@@ -1601,8 +1602,13 @@ print_status_config(zpool_handle_t *zhp, status_cbdata_t *cb, const char *name,
 		zfs_nicenum(vs->vs_write_errors, wbuf, sizeof (wbuf));
 		zfs_nicenum(vs->vs_checksum_errors, cbuf, sizeof (cbuf));
 		(void) printf(" %5s %5s %5s", rbuf, wbuf, cbuf);
+	} else {
+		(void) printf("                  ");
 	}
 
+	if (cb->cb_kind)
+		(void) printf(" %4s", kind_mark(nv));
+
 	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
 	    &notpresent) == 0) {
 		verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
@@ -6042,9 +6048,9 @@ status_callback(zpool_handle_t *zhp, void *data)
 			cbp->cb_namewidth = 10;
 
 		(void) printf(gettext("config:\n\n"));
-		(void) printf(gettext("\t%-*s  %-8s %5s %5s %5s\n"),
+		(void) printf(gettext("\t%-*s  %-8s %5s %5s %5s%s\n"),
 		    cbp->cb_namewidth, "NAME", "STATE", "READ", "WRITE",
-		    "CKSUM");
+		    "CKSUM", cbp->cb_kind ? " KIND" : "");
 		print_status_config(zhp, cbp, zpool_get_name(zhp), nvroot, 0,
 		    B_FALSE);
 
@@ -6104,10 +6110,11 @@ status_callback(zpool_handle_t *zhp, void *data)
 }
 
 /*
- * zpool status [-c CMD] [-gLPvx] [-T d|u] [pool] ... [interval [count]]
+ * zpool status [-c CMD] [-gkLPvx] [-T d|u] [pool] ... [interval [count]]
  *
  *	-c CMD	For each vdev, run command CMD
  *	-g	Display guid for individual vdev name.
+ *	-k      Display kind of device, e.g. solid-state or mixed.
  *	-L	Follow links when resolving vdev path name.
  *	-P	Display full path for vdev name.
  *	-v	Display complete error logs
@@ -6128,14 +6135,17 @@ zpool_do_status(int argc, char **argv)
 	char *cmd = NULL;
 
 	/* check options */
-	while ((c = getopt(argc, argv, "c:gLPvxDT:")) != -1) {
+	while ((c = getopt(argc, argv, "c:gkLPvxDT:")) != -1) {
 		switch (c) {
 		case 'c':
 			cmd = optarg;
 			break;
 		case 'g':
 			cb.cb_name_flags |= VDEV_NAME_GUID;
 			break;
+		case 'k':
+			cb.cb_kind = B_TRUE;
+			break;
 		case 'L':
 			cb.cb_name_flags |= VDEV_NAME_FOLLOW_LINKS;
 			break;

man/man8/zpool.8

@@ -159,7 +159,7 @@ zpool \- configures ZFS storage pools
 
 .LP
 .nf
-\fBzpool status\fR [\fB-c\fR \fBCMD\fR] [\fB-gLPvxD\fR] [\fB-T\fR d | u] [\fIpool\fR] ... [\fIinterval\fR [\fIcount\fR]]
+\fBzpool status\fR [\fB-c\fR \fBCMD\fR] [\fB-gkLPvxD\fR] [\fB-T\fR d | u] [\fIpool\fR] ... [\fIinterval\fR [\fIcount\fR]]
 .fi
 
 .LP
@@ -2108,7 +2108,7 @@ Sets the specified property for \fInewpool\fR. See the “Properties” section
 .sp
 .ne 2
 .na
-\fBzpool status\fR [\fB-c\fR \fBCMD\fR] [\fB-gLPvxD\fR] [\fB-T\fR d | u] [\fIpool\fR] ... [\fIinterval\fR [\fIcount\fR]]
+\fBzpool status\fR [\fB-c\fR \fBCMD\fR] [\fB-gkLPvxD\fR] [\fB-T\fR d | u] [\fIpool\fR] ... [\fIinterval\fR [\fIcount\fR]]
 .ad
 .sp .6
 .RS 4n
@@ -2142,6 +2142,15 @@ in parallel for each vdev for performance.
 Display vdev GUIDs instead of the normal device names. These GUIDs can be used innplace of device names for the zpool detach/offline/remove/replace commands.
 .RE
 
+.sp
+.ne 2
+.na
+\fB\fB-k\fR\fR
+.ad
+.RS 12n
+Display the kind of device a pool or vdev is based on: ssd, hdd or file.  Mixed mirror vdevs that have both ssd (or file) and hdd members are marked "mix".  A pool is considered mixed if all members are at least mixed, i.e. no pure hdd.
+.RE
+
 .sp
 .ne 2
 .na