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I installed Debian 6 on HP server with hardware RAID 5 configured.

RAID Controller Info

04:03.0 RAID bus controller [0104]: Compaq Computer Corporation Smart Array 64xx [0e11:0046] (rev 01)

Kernel version

Kernel: 3.2.0-0.bpo.4-amd64 #1 SMP Debian 3.2.39-2~bpo60+1 x86_64 GNU/Linux

At beginning boot I get message:

root@gamma:~# dmesg | grep Emask

[   22.880110] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen<br>
[   22.880188]          res 40/00:02:00:24:00/00:00:00:00:00/a0 Emask 0x4 (timeout)<br>
[   64.832076] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen?<br>
[   64.832155]          res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)<br>
[   82.816095] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen<br>
[   82.816169]          res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)

After about 3 messages, the booting starts normally.

share|improve this question
    
Hmmm...I had the very same messages on my system months ago, and the reason was faulty cabling. I kid you not. Note that connecting harddisks to a controller establishes a bus system which can mean that even if you have 3 HDDs connected (let's say the 2 last ones be connected to same controller) and #3 (slave) has faulty cabling, it can show you an error on that channel's master. It's because the bad cable may inhibit the "data flow" (remember that on an IDE system, data of both master and slave connector would go thru the very same cable leads - unless there's an interruption!) –  syntaxerror Oct 12 '13 at 20:01
    

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