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Big point why dont use a ide pci (onboard) raid controller like highpoint , promise

H

Hardware

Golden Member
Its just the pci bus has a max 133mb/s bandwidth and with a raid0/1 with fast disks the raidcontroller just kills your pci bus!
Just in my example when im doing some hdd traffic my system is choppy
abit kt7a-r onboard highpoint 370
Its just nonsens to use a 100mb/s device on a 133mb/s bus
 
You don't get STR rates exceeding 38MB/s on ANY drive. Even a combined transfer rate from two drives is not going to exceed 80MB/s. There is still 53MB of bandwidth left over on the PCI bus.
 
You know whats funny?

This dude probably is just running his HD's in PIO mode.

Try enabling DMA, and I betcha your choppiness problems go away.
 
Well 133mb/s is max transfer usually your usable bandwidth should be about 100mb/s
add in like me a bandwidth choking soundcard (sblive) , tv tuner , and ethernet 10mb/s and you get the point!
Is a big problem the raid stuff isnt connected on the southbridge (only on pci)
 
I think you're pointing the finger at the wrong thing. All 32-bit PCI cards are going to be confined to the 133MByte/sec limitation
that you refer to. This includes 32-bit PCI SCSI RAID cards. So to categorically blame the choppiness on the lack of bandwidth
of the 32-bit PCI bus doesn't hold water. If this were the case then everybody running a SCSI RAID array using 15krpm drives
would be complaining.

I think your problem is either drivers or a misconfiguration. Are you sure you're running your drives in DMA mode? What
operating system are you running? Are you having interrupt conflicts?

(Now, there are other reasons why the on-board IDE RAID controllers are inferior but it doesn't involve PCI bandwidth. It's
because they have no dedicated processor. Without one, the system CPU is required to compute XORs for higher RAID levels.
Ever wonder why you don't see onboard Promise/AMI IDE RAID controllers advertising more than just RAID-0 or RAID-1?)
 
the 133mb/s is combines for all pci slot and stuff like ide raid

so 160mb/s scsi cards on a 32bit pci card are marketing only like the new ata133 drives
the pci bus is just too old
*confirmed*
 
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