Re: Linux SATA RAID FAQ

[Alan Cox]

On Sad, 2004-08-14 at 01:31, J. Ryan Earl wrote:
> On the brightside, md raid5 is often faster than hardware raid5.  At 
> least on the 7000 and 8000 series of 3ware hardware; the 9000 series 
> looks promising though.  I haven't seen megaraid SATA numbers, and I 
> don't know what happened to the SX8.

Be cautious what you measure. One of he problems until you reach PCI-X
is PCI bandwidth. Thus software md5 can look good but the moment its
combined with other PCI activity goes down the pan entirely.

> When the libata Marvell drivers come out, you'll have a cheap upgrade 
> path for PCI-X boards if you want fast md raid: 

Agreed. PCI-X will change a lot of this for boxes that are not very
cpu/memory limited.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/