Retrieving SMART status from a SDA disk attached to a MegaRAID card

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Today I realised that manually checking the smart status of a disk required a bit more.

[root@box ~]# smartctl -a -d megaraid,0 /dev/sda
smartctl 5.43 2016-09-28 r4347 [x86_64-linux-2.6.32-696.16.1.el6.x86_64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net

Vendor:               SEAGATE
Product:              ST3146356SS
Revision:             HS10
User Capacity:        146,815,733,760 bytes [146 GB]
Logical block size:   512 bytes
Logical Unit id:      -----
Serial number:        ----
Device type:          disk
Transport protocol:   SAS
Local Time is:        Thu Mar 15 05:18:57 2018 CDT
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     32 C
Drive Trip Temperature:        68 C
Elements in grown defect list: 15
Vendor (Seagate) cache information
  Blocks sent to initiator = 3694557980
  Blocks received from initiator = 4259977977
  Blocks read from cache and sent to initiator = 2859908284
  Number of read and write commands whose size <= segment size = 1099899109
  Number of read and write commands whose size > segment size = 0
Vendor (Seagate/Hitachi) factory information
  number of hours powered up = 65098.07
  number of minutes until next internal SMART test = 23

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:   105645673        6         0  105645679   105645679      65781.538           0
write:         0        0        38        38         45      48511.618           7
verify: 48452245        7         0  48452252   48452259      43540.092           7

Non-medium error count:       48

SMART Self-test log
Num  Test              Status                 segment  LifeTime  LBA_first_err [SK ASC ASQ]
     Description                              number   (hours)
# 1  Background long   Completed                  16       1                 - [-   -    -]
# 2  Background short  Completed                  16       0                 - [-   -    -]

In order to retrieve this detail you need to use -d megaraid,n where n is the disk id number. Try 0, 1, 2, 3, etc. Or use the megaraidCLI to get a list of all the disks. I dunno I thought it was worth mentioning at least. It always pays to check this if customer is having weird I/O troubles. Quite a lot of detail is provided about errors the disk encounters. So looking here, even if SMART OK. Gives you an idea if any test failing for disk.