Johny Mail list wrote:
2007/7/3, Tejun Heo <htejun@xxxxxxxxx>:
Brad Campbell wrote:
> Johny Mail list wrote:
>> Hello list,
>> I have a little question about software RAID on Linux.
>> I have installed Software Raid on all my SC1425 servers DELL by
>> believing that the md raid was a strong driver.
>> And recently i make some test on a server and try to view if the RAID
>> hard drive power failure work fine, so i power up my server and after
>> booting and the prompt appear I disconnected the power cable of my
>> SATA hard drive. Normaly the MD should eleminate the failure hard
>> drive of the logical drive it build, and the server continue to work
>> fine like nothing happen. Oddly the server stop to respond and i get
>> this messages :
>> ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
>> ata4.00: cmd e7/00:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x0 data 0
>> res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4
(timeout)
>> ata4: port is slow to respond, please be patient (Status 0xd0)
>> ata4: port failed to respond (30sec, Status 0xd0)
>> ata4: soft resetting port
>>
>> After that my system is frozen.
How hard is it frozen? Can you blink the Numlock LED?
I believe he said it was ICH5 (different post/thread).
My observation on ICH5 is that if one unplugs a drive,
then the chipset/cpu locks up hard when toggling SRST
in the EH code.
Specifically, it locks up at the instruction
which restores SRST back to the non-asserted state,
which likely corresponds to the chipset finally actually
sending a FIS to the drive.
A hard(ware) lockup, not software.
That's why Intel says ICH5 doesn't do hotplug.
Cheers
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