smart.disk.discovery uses the generic device type returned by smartctl --scan, although smartctl --scan-open detects a more appropriate SAT access method.

This causes Zabbix to retrieve only limited SCSI SMART information from SATA drives behind a controller.

Example

Dell/Intel SATA SSDs behind a Dell PERC controller.

smartctl --scan reports:

{{/dev/sda -d scsi # /dev/sda, SCSI device
/dev/sdb -d scsi # /dev/sdb, SCSI device
/dev/bus/0 -d megaraid,0 # /dev/bus/0 [megaraid_disk_00], SCSI device
/dev/bus/0 -d megaraid,1 # /dev/bus/0 [megaraid_disk_01], SCSI device}}

Zabbix consequently discovers:

{{

{ "\{#NAME}

": "sda scsi",
"{#DISKTYPE}": "ssd",
"{#MODEL}": "",
"{#SN}": "PHYS7310027M480BGN",
"{#PATH}": "/dev/sda",
"{#RAIDTYPE}": "scsi",
"{#ATTRIBUTES}": ""
}}}

and subsequently queries the device using scsi:

smart.disk.get[/dev/sda,"scsi"]

This only returns a limited data set, for example:

{{

{ "disk_type": "ssd", "firmware_version": "", "model_name": "", "percentage_used": 0, "power_on_time": 0, "serial_number": "PHYS7310027M480BGN", "temperature": 26 }

}}

However, smartctl --scan-open correctly detects the devices as SAT:

{{/dev/sda -d sat # /dev/sda [SAT], ATA device
/dev/sdb -d sat # /dev/sdb [SAT], ATA device
/dev/bus/0 -d sat+megaraid,0 # /dev/bus/0 [megaraid_disk_00] [SAT], ATA device
/dev/bus/0 -d sat+megaraid,1 # /dev/bus/0 [megaraid_disk_01] [SAT], ATA device}}

Using either automatic detection or explicitly specifying SAT:

{{smartctl -a /dev/sda
smartctl -a -d sat /dev/sda}}

provides the complete ATA SMART information, including:

• model and firmware
• power-on hours
• ATA SMART attributes
• reallocated/pending/uncorrectable sectors
• SSD endurance information
• host reads/writes
• CRC errors
• power cycles / unsafe shutdowns

For example, the actual device reports:

{{Device Model: SSDSC2KB480G7R
Firmware Version: SCV1DL5C
Power_On_Hours: 75754
Percent_Life_Remaining: 67}}

while the Zabbix query using scsi reports empty model/firmware and zero power-on time.

Expected behavior

SMART discovery should use the most appropriate access method detected by smartmontools.

Using smartctl --scan-open, or performing equivalent device-type autodetection during discovery, would allow Agent2 to distinguish SATA devices behind SAT from actual SCSI/SAS devices.

For this example the resulting discovery should use:

{{

{#RAIDTYPE} = "sat"}}

instead of:

{{{#RAIDTYPE}

= "scsi"}}

and correspondingly preserve sat+megaraid,N where detected.

This is relevant because the device type selected during discovery is later reused by smart.disk.get[]; selecting scsi therefore permanently restricts the SMART information available to the official template.