Use Broadcom's MegaCLI to check array's disk health.

disk_check.sh

#!/usr/bin/env bash
#
# disk_check
#
# Use Broadcom's MegaCLI to check array's disk health. Log results.
# Emit email if failed disk(s) found.
#
# Author: M. Krinitz <mjk235 [at] nyu [dot] edu>
# Date: 7-JUL-2025
# License: MIT

# --- Variables ---
megacli="/opt/MegaRAID/MegaCli/MegaCli64"
log_file="/var/log/disk_check.log"
email_recipients=""

# --- Main ---
host=$(hostname)
timestamp=$(date +"%Y-%m-%d %H:%M:%S")

# Check if 'MegaCLI' utility exists. Exit if not.
if [ ! -x "$megacli" ]; then
  printf "%s - Error: MegaCli utility not found at %s. Exiting.\n" \
      "$timestamp" "$megacli" >> "$log_file"
  exit 1
fi

# Capture output and status of 'MegaCLI' utility.
megacli_output=$($megacli -showsummary -aall 2>&1)
megacli_status=$?

# Check exit status of 'megacli' utility.
if [ $megacli_status -ne 0 ]; then
  printf "%s - Error: MegaCli utility failed to execute. Output: %s\n" \
      "$timestamp" "$megacli_output" >> "$log_file"
  exit 1
fi

# Check for failed disk(s) in 'MegaCLI' output.
if printf "%s" "$megacli_output" | grep -q 'Failed'; then
  # Failed disk(s) found.
  # Emit email using default handling of plain text in 'mail'.
  printf "%s\n" "Failed disk(s) found on: $host@$timestamp." \
      "Replace the blinking red disk(s) in the front and/or back of the array." \
      "For more details, SSH to $host and run: $megacli -pdlist -aall" \
  | mail -s "ALERT: Failed Disk(s) on $host" "$email_recipients"

  # Log the event.
  printf "%s - Disk check on %s. Failed: Yes. Email sent to %s.\n" \
      "$timestamp" "$host" "$email_recipients" >> "$log_file"
    
else
    # No failed disk found.
    # Log the event.
    printf "%s - Disk check on %s. Failed: No.\n" \
        "$timestamp" "$host" >> "$log_file"
fi

# Exits status 0 if disk status check completes successfully.
exit 0