[no subject]

On Mar 1, 2004, at 9:31 AM, Jason Vinson wrote:

> Hi Danny,
>
> hdparm did report dma on, so i used d0 to turn it off on both drives, 
> but it immediately hangs upon the mkraid if i do this, so i'm thinking 
> that's not a good idea  ;)
>
> I am going to show my greenness here, but how do i run bad blocks on 
> the drives?  Are you recommending using dd to write zero's to the 
> platters?
>
> Jason
>
>
> On Mar 1, 2004, at 7:24 AM, Danny Cox wrote:
>
>> Hi, Jason!
>>
>> On Sun, 2004-02-29 at 20:54, Jason Vinson wrote:
>>> I looked in the BIOS and I don't see a setting for toggling DMA.
>>>
>>> But here's what I see from dmesg:
>>>
>>> (this is my onboard ide controller)
>>> ide0: BM-DMA at 0xfc00-0xfc07, BIOS settings: hda:DMA, hdb:DMA
>>> ide1: BM-DMA at 0xfc08-0xfc0f, BIOS settings: hdc:DMA, hdd:DMA
>>>
>>> (and these are the Promise IDE channels)
>>> ide2: BM-DMA at 0xdf50-0xdf57, BIOS settings: hde:pio, hdf:pio
>>> ide3: BM-DMA at 0xdf58-0xdf5f, BIOS settings: hdg:pio, hdh:pio
>>>
>>> hde and hdg are my potential RAID devices, and they are set to pio.  
>>> So
>>> is pio conflicting with DMA somehow, or should this not be affected 
>>> by
>>> DMA at all? And isn't there a way to turn off DMA via hdparm, or will
>>> that not work here?
>>
>> 	That's just the kernel reporting how the BIOS was set up.  There are
>> probably messages just after that which show what else the driver set
>> up.  Use "hdparm /dev/hde" and see if DMA is 0 or 1.  If necessary,
>> sometime during bootup, add "hdparm -d1 /dev/hd{e,g}" to force DMA on.
>>
>> 	But your previous post showed the drives complaining about errors.  
>> On
>> second glance, I see that 'dma_intr' is being called, confirming that
>> DMA is being used on hde at least.  The UncorrectableError is the main
>> culprit here.  Try running badblocks on the whole drive (smoke 'em if 
>> ya
>> got 'em, it'll take a wee bit ;-), and see what it says.
>>
>> 	HTH!
>>
>> -- 
>> kernel, n.: A part of an operating system that preserves the
>> medieval traditions of sorcery and black art.
>>
>> Danny
>>
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