failed command: READ DMA

[   50.641091] ata17.00: irq_stat 0x40000001
[   50.641092] ata17.00: failed command: READ DMA
[   50.641095] ata17.00: cmd c8/00:02:02:00:00/00:00:00:00:00/e0 tag 14 dma 1024 in
[   50.641095]          res 51/04:02:02:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[   50.641095] ata17.00: status: { DRDY ERR }
[   50.641096] ata17.00: error: { ABRT }
[   50.641231] ata17.00: configured for UDMA/133 (device error ignored)
[   50.641241] ata17: EH complete
[   50.641281] ata17.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[   50.641282] ata17.00: irq_stat 0x40000001
[   50.641283] ata17.00: failed command: READ DMA
[   50.641285] ata17.00: cmd c8/00:02:02:00:00/00:00:00:00:00/e0 tag 17 dma 1024 in
[   50.641285]          res 51/04:02:02:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[   50.641286] ata17.00: status: { DRDY ERR }
[   50.641287] ata17.00: error: { ABRT }
[   50.641422] ata17.00: configured for UDMA/133 (device error ignored)
[   50.641432] ata17: EH complete
[   50.641472] ata17.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[   50.641472] ata17.00: irq_stat 0x40000001
[   50.641474] ata17.00: failed command: READ DMA
[   50.641476] ata17.00: cmd c8/00:02:02:00:00/00:00:00:00:00/e0 tag 20 dma 1024 in
[   50.641476]          res 51/04:02:02:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[   50.641476] ata17.00: status: { DRDY ERR }
[   50.641477] ata17.00: error: { ABRT }
[   50.641613] ata17.00: configured for UDMA/133 (device error ignored)
[   50.641624] sd 16:0:0:0: [sdg]  
[   50.641624] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[   50.641625] sd 16:0:0:0: [sdg]  
[   50.641625] Sense Key : Aborted Command [current] [descriptor]
[   50.641626] Descriptor sense data with sense descriptors (in hex):
[   50.641629]         72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00 
[   50.641630]         00 00 00 02 
[   50.641630] sd 16:0:0:0: [sdg]  
[   50.641631] Add. Sense: No additional sense information
[   50.641631] sd 16:0:0:0: [sdg] CDB: 
[   50.641633] Read(10): 28 00 00 00 00 02 00 00 02 00
[   50.641635] ata17: EH complete
[   50.641678] ata17.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[   50.641679] ata17.00: irq_stat 0x40000001
[   50.641680] ata17.00: failed command: READ DMA
[   50.641682] ata17.00: cmd c8/00:04:04:00:00/00:00:00:00:00/e0 tag 23 dma 2048 in
[   50.641682]          res 51/04:04:04:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[   50.641683] ata17.00: status: { DRDY ERR }
[   50.641683] ata17.00: error: { ABRT }
[   50.641816] ata17.00: configured for UDMA/133 (device error ignored)
[   50.641826] ata17: EH complete
[   50.641871] ata17.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[   50.641871] ata17.00: irq_stat 0x40000001
[   50.641873] ata17.00: failed command: READ DMA
[   50.641875] ata17.00: cmd c8/00:04:04:00:00/00:00:00:00:00/e0 tag 24 dma 2048 in
[   50.641875]          res 51/04:04:04:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[   50.641876] ata17.00: status: { DRDY ERR }
[   50.641876] ata17.00: error: { ABRT }
[   50.642011] ata17.00: configured for UDMA/133 (device error ignored)
[   50.642022] ata17: EH complete
[   50.642067] ata17.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[   50.642067] ata17.00: irq_stat 0x40000001
[   50.642068] ata17.00: failed command: READ DMA
[   50.642071] ata17.00: cmd c8/00:04:04:00:00/00:00:00:00:00/e0 tag 25 dma 2048 in
[   50.642071]          res 51/04:04:04:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[   50.642071] ata17.00: status: { DRDY ERR }

[   50.642072] ata17.00: error: { ABRT }

在启动时刷出大量这样的错误日志，确认是硬盘坏掉了，最终是能启动起来，但是要刷大约120秒的这样的信息，这个盘并非是系统盘，使用来做raid5，当做存储用的，我的意思是希望在boot时并不来检测这样的信息，把系统盘加载完了就行了，不知道有没有什么方法

在网上搜了一些信息，都没有能解决，大多数的说法是acpi引起的，比如：问题

http://ubuntuforums.org/showthread.php?t=1034762&page=2和http://ubuntuforums.org/showthread.php?t=1034762这个帖子，他的解决方法是在/etc/modprobe.d里加一个options.conf文件，里面内容为options libata noacpi=1

问题得到解决，我尝试了，并没有改变，仍然要刷120秒左右

比如这个帖子http://ubuntuforums.org/showthread.php?t=1853783是通过在启动项里加参数来解决的：

 /etc/default/grub里

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off pci=noacpi"

然后运行update-grub，更行一下grub，尝试后，刷此类信息的时间到时缩短了，这是在ubuntu下的结果，在opensuse下不行，会在boot时卡住了。

我猜想boot时和udev有关吧，但是没有任何的头绪，哎~~~~~~

要如何才能在boot时并不来检测这样的信息，把系统盘加载完了就行了呢？？？？

这里留个记号，待以后有机会了再来解决这个问题了