[CentOS] Re: software raid

[Feizhou]

John R Pierce wrote:
> 
>> One drawback is software raid wants a single ide device on each ide 
>> channel.
>> This means buying an ide card (if you want more than two devices) 
>> which doesn't
>> always play well with the rest of the system (4+ ide devices).  Some 
>> mainboards
>> might have more than two ide channels, but I just opted for the cheap 
>> ide card.
> 
> thats easy.  SATA.  one device per channel.  you can get 8 ports or more 
> of SATA on a PCI-X or PCI-Express x4 card.   parallel IDE is dead.
> 
> except, I've never heard of any such limitation, other than the 
> potential performance bottleneck.

One drive going down on a IDE channel can take the whole channel due to 
the controller being confused or what not. This is why you get RAID 
(real and fake) boards with 4 or more channels on which to connect a 
single IDE drive.