[Xen-API] ATA Kernel Warnings

[Amit More <amore@xxxxxxxxx>]

Hi All,

I have a bunch of Dell PowerEdge 2950 servers with TEAC DV-28E-V DVD ROM 
running XCP 1.1. My kernel logs are filled with the following messages. 

2014.01.10 - 13:17:22   vmhost1 Warning kernel   kernel: ata1: device not ready 
(errno=-16), forcing hardreset
2014.01.10 - 13:17:17   vmhost1 Warning kernel   kernel: ata1: link is slow to 
respond, please be patient (ready=0)
2014.01.10 - 13:17:12   vmhost1 Error   kernel   kernel: ata1.00: status: { 
DRDY ERR }
2014.01.10 - 13:17:12   vmhost1 Error   kernel   kernel: res 
51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
2014.01.10 - 13:17:12   vmhost1 Error   kernel   kernel: ata1.00: cmd 
a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
2014.01.10 - 13:17:12   vmhost1 Error   kernel   kernel: ata1.00: exception 
Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
2014.01.10 - 13:17:12   vmhost1 Warning kernel   kernel: ata1.00: qc timeout 
(cmd 0xa0)

I also have other Dell PowerEdge systems with non TEAC DV-28E-V DVD ROM running 
XCP 1.1 and those systems are not reporting any of the above kernel warnings. 
Looking into the issue I found that there is a bug in XenServer 5.6 running on 
systems with TEAC DV-28E-V DVD ROM. The bug report can be found at 
http://support.citrix.com/article/CTX126919. Though this bug is not causing my 
Dom0 CPU to overload, I suspect ATA kernel warnings are related to this bug. 

There is a driver update that was released by Citrix. I believe that the 
updated driver is included in XCP 1.1. This can be confirmed by executing 
"modinfo ata_generic" command. This leaves me wondering if the ATA kernel 
warnings are related to the bug mentioned above. 

Any insights would be greatly appreciated.

Thanks in Advance,
Amit 
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