Smartctl Open Device Dev Sda Failed Dell | Or Megaraid Controller Please Try Adding 39d Megaraid N 39 Extra Quality !!top!!

PD LIST : ======= EID:Slt DID State DG Size Intf Med 16:0 0 Onln 0 1.818 TB SATA HDD 16:1 1 Onln 0 1.818 TB SATA HDD Here, DID column gives 0 and 1 as physical drive numbers. Sometimes helpful for direct-attached drives, but less so behind RAID. Try:

#!/bin/bash LOGICAL_DEV="/dev/sda" MAX_DISKS=32 # Adjust based on max expected drives for N in $(seq 0 $((MAX_DISKS-1))); do echo "Checking $LOGICAL_DEV -d megaraid,$N" smartctl -H -d megaraid,$N $LOGICAL_DEV > /dev/null 2>&1 if [ $? -eq 0 ]; then echo "Disk $N exists. Health status:" smartctl -H -d megaraid,$N $LOGICAL_DEV | grep "SMART overall-health" echo "---" else # No more disks found break fi done PD LIST : ======= EID:Slt DID State DG

smartctl open device: /dev/sda failed: DELL or MegaRAID controller, please try adding -d megaraid,N This message appears because smartctl (part of the smartmontools package) expects to communicate directly with a physical disk. However, a RAID controller presents a (e.g., /dev/sda , /dev/sdb ) to the operating system. The OS sees only the logical array, not the individual physical disks behind the controller. To get S.M.A.R.T. data from each physical drive, you must bypass this virtualization using the -d megaraid,N flag. -eq 0 ]; then echo "Disk $N exists

SMART Health Status: OK smartctl -A -d megaraid,1 /dev/sda Test background self-check on disk 3 smartctl -t short -d megaraid,2 /dev/sda View all S.M.A.R.T. info for disk 0 smartctl -a -d megaraid,0 /dev/sda What if you have multiple logical drives? If your controller presents multiple logical drives ( /dev/sda , /dev/sdb , /dev/sdc ), then /dev/sda may contain physical disks with IDs 0,1,2 and /dev/sdb may contain physical disks with IDs 3,4,5. The N value is controller-wide , not per logical drive. So you can usually access all physical disks through any logical device, but safest is to use the logical drive that belongs to the same RAID group. When in doubt, try all N on /dev/sda . The OS sees only the logical array, not

The article explains the error, why it happens, how to fix it, and includes best practices for monitoring RAID drives behind Dell PERC / MegaRAID controllers. Introduction If you manage servers with hardware RAID controllers—especially Dell PowerEdge servers with PERC (PowerEdge RAID Controller) or any system using a Broadcom (formerly LSI) MegaRAID controller—you have likely encountered a frustrating error when trying to check disk health with smartctl :