To fix the communication block, you must rewrite your instruction using the device type parameter: -d megaraid,N . The variable acts as a unique target coordinate matching the physical slot or Device ID managed by the hardware backplane.
Before running smartctl , you need to know which physical drive (N) you want to query. Use storcli or megacli to list the devices. sudo storcli /c0 /eall /sall show Use code with caution.
Note: If /dev/sda doesn't work, try a generic device node like /dev/sg0 or /dev/sg1 . 3. Read S.M.A.R.T. Data for a Specific Drive
When smartctl cannot retrieve data (e.g., due to "ATA return descriptor not supported"), the RAID controller's management tools are indispensable. To fix the communication block, you must rewrite
If you are unsure of the correct N and do not have administrative tools available, you can script a loop to test possible IDs. For example, to test all IDs from 0 to 30 on /dev/sda :
By using the -d megaraid,N flag, you can bypass the abstraction layer and perform crucial health monitoring on your Dell PERC-managed drives.
smartctl -a -d megaraid,4 /dev/sda
To find the logical drive number, you can use the megacli command, which is a utility provided by LSI (now part of Broadcom) for managing MegaRAID controllers.
/dev/sda -d megaraid,0 # /dev/sda, Physical Disk 0 /dev/sda -d megaraid,1 # /dev/sda, Physical Disk 1 /dev/sda -d megaraid,2 # /dev/sda, Physical Disk 2
Thus, the error message is actually : it tells you exactly what to do—add the -d megaraid,N option. Use storcli or megacli to list the devices
The output includes a column labeled DID —that is the (DID) you need to use for the N parameter.
If you are working with SSDs behind a PERC controller, a more precise command that often works better for SATA-to-SAS translation is: smartctl -a -d sat+megaraid,N /dev/sda Use code with caution.
Replace 0 with the specific slot sequence discovered in earlier tasks. including device temperature
If successful, you will bypass the initial controller failure blocks and pull standard diagnostic metrics, including device temperature, power-on hours, reallocated sector counts, and drive health status. Making the Configuration Permanent