Phill
Here is a before of my /dev directory
crw-rw---- 1 root tty 7, 129 Mar 9 19:23 vcsa1
crw-rw---- 1 root tty 7, 128 Mar 9 19:23 vcsa
crw-rw---- 1 root tty 7, 1 Mar 9 19:23 vcs1
crw-rw---- 1 root tty 7, 0 Mar 9 19:23 vcs
crw------- 1 root root 248, 0 Mar 9 19:23 usbmon0
crw-rw---- 1 root disk 21, 2 Mar 9 19:23 sg2
crw-rw---- 1 root disk 21, 1 Mar 9 19:23 sg1
crw-rw---- 1 root disk 21, 0 Mar 9 19:23 sg0
crw-rw---- 1 root disk 21, 8 Mar 9 19:23 sg8
crw-rw---- 1 root disk 21, 7 Mar 9 19:23 sg7
crw-rw---- 1 root disk 21, 6 Mar 9 19:23 sg6
crw-rw---- 1 root disk 21, 5 Mar 9 19:23 sg5
crw-rw---- 1 root disk 21, 4 Mar 9 19:23 sg4
crw-rw---- 1 root disk 21, 3 Mar 9 19:23 sg3
crw------- 1 root root 247, 1 Mar 9 19:23 hidraw1
crw------- 1 root root 247, 2 Mar 9 19:23 hidraw2
crw-rw---- 1 root lp 99, 0 Mar 9 19:23 parport0
crw------- 1 root root 10, 232 Mar 9 19:23 kvm
crw------- 1 root root 250, 0 Mar 9 19:23 watchdog0
crw------- 1 root root 10, 130 Mar 9 19:23 watchdog
drwxr-xr-x 4 root root 220 Mar 9 19:23 input
brw-rw---- 1 root disk 8, 0 Mar 9 19:23 sda
brw-rw---- 1 root disk 8, 3 Mar 9 19:23 sda3
brw-rw---- 1 root disk 8, 2 Mar 9 19:23 sda2
brw-rw---- 1 root disk 8, 1 Mar 9 19:23 sda1
crw-rw---- 1 root tty 7, 133 Mar 9 19:23 vcsa5
crw-rw---- 1 root tty 7, 132 Mar 9 19:23 vcsa4
crw-rw---- 1 root tty 7, 131 Mar 9 19:23 vcsa3
crw-rw---- 1 root tty 7, 130 Mar 9 19:23 vcsa2
crw-rw---- 1 root tty 7, 5 Mar 9 19:23 vcs5
crw-rw---- 1 root tty 7, 3 Mar 9 19:23 vcs3
crw-rw---- 1 root tty 7, 2 Mar 9 19:23 vcs2
drwxr-xr-x 20 root root 3540 Mar 9 19:23 .
crw-rw---- 1 root tty 7, 134 Mar 9 19:23 vcsa6
crw-rw---- 1 root tty 7, 6 Mar 9 19:23 vcs6
crw-rw---- 1 root tty 7, 4 Mar 9 19:23 vcs4
drwxr-xr-x 2 root root 3460 Mar 9 19:23 char
dr-xr-xr-x. 1 root root 204 Mar 9 19:25 …
crw-rw-rw- 1 root tty 5, 2 Mar 9 19:29 ptmx
Then I run this one command
smartctl -a -d 3ware,0 /dev/twl0
and I get the devices listed below
crw–w---- 1 root tty 4, 62 Mar 9 19:23 tty62
crw-rw---- 1 root tty 7, 129 Mar 9 19:23 vcsa1
crw-rw---- 1 root tty 7, 128 Mar 9 19:23 vcsa
crw-rw---- 1 root tty 7, 1 Mar 9 19:23 vcs1
crw-rw---- 1 root tty 7, 0 Mar 9 19:23 vcs
crw------- 1 root root 248, 0 Mar 9 19:23 usbmon0
crw-rw---- 1 root disk 21, 2 Mar 9 19:23 sg2
crw-rw---- 1 root disk 21, 1 Mar 9 19:23 sg1
crw-rw---- 1 root disk 21, 0 Mar 9 19:23 sg0
crw-rw---- 1 root disk 21, 8 Mar 9 19:23 sg8
crw-rw---- 1 root disk 21, 7 Mar 9 19:23 sg7
crw-rw---- 1 root disk 21, 6 Mar 9 19:23 sg6
crw-rw---- 1 root disk 21, 5 Mar 9 19:23 sg5
crw-rw---- 1 root disk 21, 4 Mar 9 19:23 sg4
crw-rw---- 1 root disk 21, 3 Mar 9 19:23 sg3
crw------- 1 root root 247, 1 Mar 9 19:23 hidraw1
crw------- 1 root root 247, 2 Mar 9 19:23 hidraw2
crw-rw---- 1 root lp 99, 0 Mar 9 19:23 parport0
crw------- 1 root root 10, 232 Mar 9 19:23 kvm
crw------- 1 root root 250, 0 Mar 9 19:23 watchdog0
crw------- 1 root root 10, 130 Mar 9 19:23 watchdog
drwxr-xr-x 4 root root 220 Mar 9 19:23 input
brw-rw---- 1 root disk 8, 0 Mar 9 19:23 sda
brw-rw---- 1 root disk 8, 3 Mar 9 19:23 sda3
brw-rw---- 1 root disk 8, 2 Mar 9 19:23 sda2
brw-rw---- 1 root disk 8, 1 Mar 9 19:23 sda1
crw-rw---- 1 root tty 7, 133 Mar 9 19:23 vcsa5
crw-rw---- 1 root tty 7, 132 Mar 9 19:23 vcsa4
crw-rw---- 1 root tty 7, 131 Mar 9 19:23 vcsa3
crw-rw---- 1 root tty 7, 130 Mar 9 19:23 vcsa2
crw-rw---- 1 root tty 7, 5 Mar 9 19:23 vcs5
crw-rw---- 1 root tty 7, 3 Mar 9 19:23 vcs3
crw-rw---- 1 root tty 7, 2 Mar 9 19:23 vcs2
crw-rw---- 1 root tty 7, 134 Mar 9 19:23 vcsa6
crw-rw---- 1 root tty 7, 6 Mar 9 19:23 vcs6
crw-rw---- 1 root tty 7, 4 Mar 9 19:23 vcs4
drwxr-xr-x 2 root root 3460 Mar 9 19:23 char
dr-xr-xr-x. 1 root root 204 Mar 9 19:25 …
crw-rw-rw- 1 root tty 5, 2 Mar 9 19:39 ptmx
crw------- 1 root root 244, 9 Mar 9 19:39 twl9
crw------- 1 root root 244, 8 Mar 9 19:39 twl8
crw------- 1 root root 244, 7 Mar 9 19:39 twl7
crw------- 1 root root 244, 6 Mar 9 19:39 twl6
crw------- 1 root root 244, 5 Mar 9 19:39 twl5
crw------- 1 root root 244, 4 Mar 9 19:39 twl4
crw------- 1 root root 244, 3 Mar 9 19:39 twl3
crw------- 1 root root 244, 2 Mar 9 19:39 twl2
crw------- 1 root root 244, 15 Mar 9 19:39 twl15
crw------- 1 root root 244, 14 Mar 9 19:39 twl14
crw------- 1 root root 244, 13 Mar 9 19:39 twl13
crw------- 1 root root 244, 12 Mar 9 19:39 twl12
crw------- 1 root root 244, 11 Mar 9 19:39 twl11
crw------- 1 root root 244, 10 Mar 9 19:39 twl10
crw------- 1 root root 244, 1 Mar 9 19:39 twl1
crw------- 1 root root 244, 0 Mar 9 19:39 twl0
drwxr-xr-x 20 root root 3860 Mar 9 19:39 .
and I get this output also if I try to run twl1, 2,3 etc I get nothing so not sure why I get an output for twl0 and nothing else.
[root@rockstor dev]# smartctl -a -d 3ware,0 /dev/twl0
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-4.3.3-1.el7.elrepo.x86_64] (local build)
Copyright © 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Western Digital RE4 (SATA 6Gb/s)
Device Model: WDC WDxxxxxxxxxxxxxxxxx
Serial Number: WD-WCCxxxxxxxxx
LU WWN Device Id: 5 00xxxx xxxxxxxx
Firmware Version: 01.01K02
User Capacity: 2,000,398,934,016 bytes [2.00 TB]
Sector Size: 512 bytes logical/physical
Rotation Rate: 7200 rpm
Device is: In smartctl database [for details use: -P show]
ATA Version is: ATA8-ACS (minor revision not indicated)
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Wed Mar 9 19:41:43 2016 EST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x82) Offline data collection activity
was completed without error.
Auto Offline Data Collection: Enabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: (25200) seconds.
Offline data collection
capabilities: (0x7b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 275) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x70bd) SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 167 161 021 Pre-fail Always - 6641
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 109
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 088 088 000 Old_age Always - 8891
10 Spin_Retry_Count 0x0032 100 100 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 109
183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 108
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 1
194 Temperature_Celsius 0x0022 117 086 000 Old_age Always - 33
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 0
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
No self-tests have been logged. [To run self-tests, use: smartctl -t]
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
Hope this helps