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SubjectRe: 3Ware Hard Bus Hang 2.4.18 > 220 MB/S
On Wed, Feb 27, 2002 at 10:48:25AM -0700, Andreas Dilger wrote:
> On Feb 27, 2002 10:25 -0700, Jeff V. Merkey wrote:
> > Running 4 3Ware 7810 Adapters with the updated 48 bit LBA firmware
> > for the 78110, and attached to 8 Maxtor 160 GB hard disks on each card
> > (32 drives total) striping Raid 0m across 5.6 terabytes of disk, I am
> > seeing about 216-224 MB/S total throughput on writes to local
> > arrays on 2.4.18.
> Have you done any kind of variations on this configuration to see when
> or where the maximum throughput happens? Daniel and I were speculating
> about where the 3ware limits are. Specs say 100MB/s per adapter (for
> both 6000 and 7000 series), you would probably hit max bandwidth with
> 2 adapters. The drives themselves are not a limiting factor, unless
> you are down to striping across only 2 drives instead of all 8. I take
> it you are using the hardware RAID instead of software MD RAID?

Single adapter can push 130 MB/S with 8 drives striped at RAID 0
(hardware RAID not software). With 2 adapters with 8 drives, the
max rate of 216 MB/S is achieved. Adding additional adapters
on the same PCI bus hits the wall at 238+- MB/S. I have not tried
putting the two other 3Ware's on the 66 Mhz bus, but in theory, this
would result in 350 MB/S total throughput from what I am seeing
with the Gigabit ethernet adapter.

> > The system is also running an Intel Gigabit Ethernet Card at
> > 116-122 MB/S with full network traffic and writing this traffic to
> > the 3Ware arrays. All this hardware is running on a Serverworks
> > HE chipset with a SuperMicro motherboard and dual 933 Mhz PIII
> > processors.
> Does this board have multiple PCI busses? Is the GigE card on a
> different bus than the 3ware cards?

The Gigabit adapter is running on the 66 Mhz bus. When combined with
SCI I am able to push 238 MB/S through the SCI to the 3Ware adapters
and out to disk. At present, I have modified the SCI drivers and I am
DMA'ing directly into Linus buffer cache from the SCI disk data.

Very very fast. The 3Ware adapters are barfing when the BH count
gets too high. I have no idea why.


> Cheers, Andreas
> --
> Andreas Dilger
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