[CentOS] Re: Anaconda doesn't support raid10

[Ruslan Sivak]

Feizhou wrote:
> Ruslan Sivak wrote:
>> Feizhou wrote:
>>> Ross S. W. Walker wrote:
>>>> Hey look at me! I'm top-posting!!! Nanny-nanny-poo-poo
>>>>
>>>> Come get me Trolls!
>>>
>>> Please do not top post. :)
>>>
>> He was probably hinting at me for top posting.  Unfortunately, 
>> sometimes I write from the blackberry, which only allows top 
>> posting.  Take it up with RIM.
>
> Hence the smiley.
>
I know you meant it in a joking way.  I'm kinda pissed at RIM though for 
not letting me reply properly on my blackberry. 
>>>
>>>> SATA drives typically do 60-70MBs, interleaved you
>>>> should see 120-140MB/s on sequential. Random IO on SATA
>>>> usually sucks too badly to even talk about...
>>>
>>> Eh? It cannot be worse than PATA drives now can it?
>>> _______________________________________________
>>
>> Probably not, but is SATA really much worse then SCSI or SAS?  I did 
>> some testing on a dell PE 2950 of 750GB SATA's vs SAS and SCSI 
>> drives, and the SATA drives seem to be faster at least at first 
>> glance.  I don't have good numbers from the  SCSI tests, but at least 
>> for sequantial, I'm getting a better speed off the SATAs.
>
> sequential will be better than SCSI due to the packing on those 
> platters which make up for the lack in rpm. NCQ should even up the 
> random ability of SATA disks versus SCSI drives but that support has 
> only become available lately on Linux and you also need the right 
> hardware (besides the right disks).
How would I know if my system is using NCQ?  I think my drives and card 
should support it.

Russ