Paul Goldman wrote:
> Thanks.
>
> The board recognizes the drives when they are not configured as a Raid
> array. In fact, I am running currently on one of the drives as the C: drive
> with the other the D:. I am running Windows 2003 Small Business Server. If I
> can't get this thing to go with hardware Raid, I may configure as software
> Raid.
>
> What is the performance implications of changing from SATA1 and SATA2? Also,
> I didn't notice any jumpers. Do all SATA hard drives have jumpers?
>
There is little performance impact. Consider for example.
1) Typical hard drive sustained transfer rate - 70MB/sec
2) SATA1 - 150MB/sec (theoretical limit, with overheads)
3) SATA2 - 300MB/sec (theoretical limit, with overheads)
What would be affected, is the burst transfer rate. When small
chunks of data are transferred, they are stored in the cache RAM
on the drive controller board, and are then written out to the media.
Once the size of transfer exceeds the cache, then the transfer
is limited by the media rate (the 70MB/sec number).
So only relatively small bursts will not be seeing "300MB/sec" transfer
rates. Long transfers, will be limited by the media (head to disk),
and neither cable rate is an issue in that case.
The fastest SATA drive right now, is the Velociraptor, at 120MB/sec
near the beginning of the disk. So that is the fastest sustained
transfer rate.
Not all drives have jumpers to "Force 150" a drive. With a Hitachi
drive, you'd use Hitachi Feature Tool, to perform a change to force
a particular rate. And then communication with the drive is only
guaranteed, if the drive is connected to a 300MB/sec capable
interface. (You could, for example, use a SATA 150MB/sec motherboard,
flip the Hitachi drive to 300MB/sec mode, and then lose communications with
it. Then need a SATA 300MB/sec motherboard, to flip it back.)
Many other drives have the forcing jumper, so it is easier to deal
with. A Seagate document, mentions that it is mainly VIA chipsets
and their SATA 150MB/sec interfaces, that require the "Force 150"
jumper to work. Many other 150MB/sec interfaces will auto-negotiate
just fine, and work without jumper changes.
(See page 11)
http://www.seagate.com/staticfiles/m...n_guide_en.pdf
Check the reviews on Newegg, as they do note that 1TB drives and
some interfaces, don't play nice. And as far as I know, there isn't
an excuse for it. You could always switch to smaller drives, like
4x500 rather than 2x1TB.
http://www.newegg.com/Product/Produc...82E16822148278
Paul