chinhvc / smartctl-monitoring-disks

Research about S.M.A.R.T tool to monitor disk status

smartctl-monitoring-disks

Research about S.M.A.R.T tool to monitor disk status

sudo smartctl -a /dev/sdb
smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.10.102.1-microsoft-standard-WSL2] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Vendor:               Msft
Product:              Virtual Disk
Revision:             1.0
Compliance:           SPC-3
User Capacity:        274,877,906,944 bytes [274 GB]
Logical block size:   512 bytes
Physical block size:  4096 bytes
LU is thin provisioned, LBPRZ=0
>> Terminate command early due to bad response to IEC mode page
A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options.

Solution

for ((i=1; i<=n; i++)); 
do 
	sudo smartctl -a /dev/sdb | awk 'NR>4' | sed -e '/^>>/,$d'| jq -Rs 'split("\n") | map(split(":") | map(gsub(" "; "")) | select(length > 1) | {(.[0]): .[1]}) | add'; 
done

Explaination

sudo smartctl -a /dev/sdb | awk 'NR>4' | sed -e '/^>>/,$d':

• sudo smartctl -a /dev/sdb: This command uses smartctl to retrieve information about the specified device /dev/sdb.
• awk 'NR>4': Filters the output from smartctl, displaying only lines starting from line number 5 and onwards (NR>4 means "number of records greater than 4").
• sed -e '/^>>/,$d': Uses sed to remove all lines from the line that starts with >> until the end of the output. It discards any error-related messages captured by smartctl.

jq -Rs 'split("\n") | map(split(":") | map(gsub(" "; "")) | select(length > 1) | {(.[0]): .[1]}) | add':

• jq -Rs: Invokes jq in raw input mode (-R) to read input as a single string (-s), rather than a stream of JSON objects.

• 'split("\n") | map(split(":") | map(gsub(" "; "")) | select(length > 1) | {(.[0]): .[1]}) | add': This is a series of jq filters to manipulate and process the string input. Breaking it down:

  • split("\n"): Splits the input string into an array based on newline characters.
  • map(split(":") | map(gsub(" "; "")) | select(length > 1) | {(.[0]): .[1]}): For each line (now an array element):
  • split(":"): Splits each line into an array using the colon : as a separator.
  • map(gsub(" "; "")): Removes any spaces from the resulting array elements.
  • select(length > 1): Filters out array elements with a length less than or equal to 1.
  • {(.[0]): .[1]}: Constructs objects with key-value pairs, taking the first and second elements of the array as key and value, respectively.
  • add: Merges all the resulting objects into a single JSON object.

This whole command sequence takes the output from smartctl, processes it to extract key-value pairs separated by :, removes spaces, filters the valid pairs, and constructs a JSON object with these pairs.

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