Setup:

$ ls -l /dev/disk/by-id/wwn-0x5000xxxx
lrwxrwxrwx 9 root 2020-10-31 15:15 /dev/disk/by-id/wwn-0x5000xxxx -> ../../sda
$ cat /etc/smartd.conf
/dev/disk/by-id/wwn-0x5000xxxx -d ignore
DEVICESCAN -a

Expected result:

Device with specified id is ignored.

Actual result:

Device (/dev/sda in this example) is not ignored.

Analysis:

This issue seems to be similar to #313.

Duplicate detection (is_duplicate_dev_idinfo) relies on populated dev_idinfo, and that is done in ATADeviceScan. But "-d ignore" bypasses any scanning altogether, thus duplicate detection is unable to deduce that /dev/sda and /dev/disk/by-id/wwn-0x5000xxxx are actually the same device.

There is another duplicate detection function (is_duplicate_device), but it relies on dev_names being exactly equal. I attempted to fix the issue by checking if dev_name is a symbolic link and resolving the link to actual file in such cases - seems to work correctly.

Please find attached for your consideration a patch that implements symlink resolution for device names (apply with patch --input=resolve_device_symlinks.patch in source directory).

I have 2 DELL PERC 6/i controllers on different servers. Only difference is that first is connected to SATA drives and second - to SAS. While there is no problems at all with SAS drive, SATA is not working w/o -T permissive:

Output from controller with SAS drives:

smartctl 5.39 2009-09-22 r2922M [x86_64-unknown-linux-gnu] (local build) Copyright (C) 2002-9 by Bruce Allen, ​http://smartmontools.sourceforge.net

Creating /dev/megaraid_sas_ioctl_node = 17 Got MegaRAID inquiry.. FUJITSU MAX3073RC D206 Device: FUJITSU MAX3073RC Version: D206 Serial number: DQA3P6700JF9 Device type: disk Transport protocol: SAS Local Time is: Wed Sep 23 17:29:54 2009 EDT Device supports SMART and is Enabled Temperature Warning Disabled or Not Supported SMART Health Status: OK

Current Drive Temperature: 29 C [SKIP]

Output from controller with SATA drives: [root@var-dev smartmontools]# ./smartctl /dev/sda -d megaraid,0 -i -a smartctl 5.39 2009-09-22 r2922 [x86_64-unknown-linux-gnu] (local build) Copyright (C) 2002-9 by Bruce Allen, ​http://smartmontools.sourceforge.net

Creating /dev/megaraid_sas_ioctl_node = 17 Got MegaRAID inquiry.. ATA WDC WD5000AACS-01B01 /dev/sda [megaraid_disk_00] [SAT]: Device open changed type from 'megaraid' to 'sat'

START OF INFORMATION SECTION

Model Family: Western Digital Caviar Green family Device Model: WDC WD5000AACS-00ZUB0 Serial Number: WD-WCASU7381205 Firmware Version: 01.01B01 User Capacity: 500,107,862,016 bytes Device is: In smartctl database [for details use: -P show] ATA Version is: 8 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Wed Sep 23 14:31:46 2009 PDT SMART support is: Available - device has SMART capability. SMART support is: Enabled

Rejecting SMART/ATA command to controller Rejecting SMART/ATA command to controller Error SMART Status command failed Please get assistance from ​http://smartmontools.sourceforge.net/ A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options.

Trying -T permissive, and, bingo, it works!

smartctl 5.39 2009-09-22 r2922 [x86_64-unknown-linux-gnu] (local build) Copyright (C) 2002-9 by Bruce Allen, ​http://smartmontools.sourceforge.net

Creating /dev/megaraid_sas_ioctl_node = 17 Got MegaRAID inquiry.. ATA WDC WD5000AACS-01B01 /dev/sda [megaraid_disk_00] [SAT]: Device open changed type from 'megaraid' to 'sat'

START OF INFORMATION SECTION

Model Family: Western Digital Caviar Green family Device Model: WDC WD5000AACS-00ZUB0 Serial Number: WD-WCASU7381205 Firmware Version: 01.01B01 User Capacity: 500,107,862,016 bytes Device is: In smartctl database [for details use: -P show] ATA Version is: 8 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Wed Sep 23 14:32:31 2009 PDT SMART support is: Available - device has SMART capability. SMART support is: Enabled

Rejecting SMART/ATA command to controller Rejecting SMART/ATA command to controller Error SMART Status command failed Please get assistance from ​http://smartmontools.sourceforge.net/

START OF READ SMART DATA SECTION

SMART overall-health self-assessment test result: PASSED

General SMART Values: Offline data collection status: (0x84) Offline data collection activity

was suspended by an interrupting command from host. 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.

[SKIP]

smartctl does not use the 9 bit value from the directory properly and instead reads the value 256 as zero

Steps to reproduce: smartctl -l devstat /dev/sdX on any drive that has a directory such as this

0x04       GPL     R/O    256  Device Statistics log

Expected behavior: print device statistics patched version shown

#smartctl -l devstat /dev/sdd
smartctl 6.7 2017-11-06 r4602 [x86_64-linux-4.9.16-gentoo] (local build)
Copyright (C) 2002-17, Bruce Allen, Christian Franke, www.smartmontools.org

Device Statistics (GP Log 0x04)
Page  Offset Size        Value Flags Description
0x01  =====  =               =  ===  == General Statistics (rev 1) ==
0x01  0x008  4               6  ---  Lifetime Power-On Resets
0x01  0x010  4             913  ---  Power-on Hours
....

Actual Behavior

#smartctl -l devstat /dev/sdd
smartctl 6.7 2017-11-06 r4602 [x86_64-linux-4.9.16-gentoo] (local build)
Copyright (C) 2002-17, Bruce Allen, Christian Franke, www.smartmontools.org

Device Statistics (GP/SMART Log 0x04) not supported

fix: included patch, enable already existing code to parse >8bit values in GetNumLogSectors? when reading gplog devstat logs.