[CentOS] Strange performance issue on CentOS 6.7 server

Thu Feb 4 00:30:34 UTC 2016
James Hogarth <james.hogarth at gmail.com>

On 3 Feb 2016 22:24, "Alfred von Campe" <alfred at von-campe.com> wrote:
> 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.

Severely degraded hardware RAID performance can often be caused by things
like a failed cache battery.

There is usually some sort of tool to interrogate the device to check
things like cache behaviour.