Vinum & U320 SCSI, slower than UDMA100 IDE ?

[Chad Leigh -- Shire.Net LLC]

On Nov 27, 2003, at 5:44 AM, Sander Smeenk wrote:

> Hi,
>
> I recently installed a Dual P4 2.8ghz with FBSD 4.9 and made a RAID10
> array of the 4 scsi disks available. The idea was that this would be
> faster to read from than normal IDE disks. As a test I took the
> company's web/ directory, which is 1.6gb in size and has 22082 files.
>

<snip>

> I know it's not the most sophisticated test, but at least it shows that
> on the IDE disk, this 'test' took 24 seconds to complete. On the RAID10
> array it took a whopping 73 seconds to complete.
>
> I would understand if the RAID10 array was as fast as IDE, or faster,
> but i'm a bit amazed by these results. The RAID10 array was built on 4x
> 36.7gb Ultra320 SCSI disks, connected to an Adaptec 39320D Ultra320 
> SCSI
> adapter, which is a PCI-X card, configured in a PCI-X slot.
>

Try creating the same vinum set using 4 ATA100 disks and see what 
happens when compared to your UeberSCSI vinum set...

Chad