More info from the log to the USB problem:

Jun 17 10:06:45 pmh kernel: usb 2-1.4: reset high speed USB device number 4 using ehci_hcd
Jun 17 10:06:45 pmh kernel: usb 2-1: USB disconnect, device number 2
Jun 17 10:06:45 pmh kernel: usb 2-1.1: USB disconnect, device number 3
Jun 17 10:06:45 pmh kernel: usb 2-1.4: USB disconnect, device number 4
Jun 17 10:06:45 pmh kernel: usb 2-1.4: device descriptor read/all, error -19


Andras


Begin forwarded message:

Date: Tue, 17 Jun 2014 10:25:36 +0200
From: Andras Horvath <[log in to unmask]>
To: [log in to unmask]
Subject: DELL server and hw Raid problem with latest 6.5 kernel


Hi Everyone,

I've got the following server:

DELL Poweredge T110 II
01:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2008 [Falcon] (rev 03)
System is SL 6.5 64 bit with hw raid 1 setup, so array is seen as sda

I'm having problem with the latest kernel version for some time now. The previous kernel version boots fine and everything works just well, but the latest kernel (v2.6.32-431.17.1.el6.x86_64) cannot boot and Grub says something like "trying to reach blocks outside of partition" and that's all the message there is and boot hangs.

All the former kernel versions worked fine. Could there have been a change in the modules handling the raid controller?

I've got another issue as well that regards the previous kernel that I'm using now (v2.6.32-431.11.2.el6.x86_64) instead of the latest one. The USB devices seem to lose connection from time to time (UPS and USB disks). And when this happens, they cannot be used anymore. A full reboot is needed before I can connect and use an external USB disk for example. Without reboot, the device just doesn't show up in /dev. I found error messages in the log as below:

kernel: usb 2-1.1: ctrl urb status -75 received
kernel: usb 2-1: clear tt 1 (8030) error -110


Has anyone encountered issues like that? I'd appreciate opinions on how to track further down the problem.

Thanks!

Andras