On Feb 3, 2016, at 17:10, Warren Young wrote: > smartctl can see through several different types of RAID controller to the underlying physical disks via its -d option. This is what I have: # smartctl --all /dev/sda smartctl 5.43 2012-06-30 r3573 [i686-linux-2.6.32-573.12.1.el6.i686] (local build) Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net Vendor: IBM Product: ServeRAID M5110e Revision: 3.19 User Capacity: 1,494,996,746,240 bytes [1.49 TB] Logical block size: 512 bytes Logical Unit id: 0x60050760408e81b018be601809efd11c Serial number: 001cd1ef091860be18b0818e40600705 Device type: disk Local Time is: Wed Feb 3 17:13:34 2016 EST Device does not support SMART Error Counter logging not supported Device does not support Self Test logging I guess I am stuck since it says it doesn’t support SMART. Or is there some way to get some status from this “disk” to see if it’s really the root cause of my performance issues. I think I would have seen something in /var/log/messages if there was a critical issue. Alfred