Slow Backup Performance using USB Device

  • 7002664
  • 17-Feb-2009
  • 27-Apr-2012


Novell NetWare 6.5
Novell Open Enterprise Server (NetWare based)
CA BrightStor ARCserve Backup 11.1


Maxtor USB Drive

Slow Backup Performance using USB Device as target


Novell includes 3 different USB drivers with Netware.  The three drivers included are:


These drivers represent the three industry USB standards.

OHCI - Open Host Controller Interface (standard by Compaq)
UHCI - Universal Host Controller Interface (standard by Intel)
EHCI - Extended Host Controller Interface (Universal 2.0 USB Standard)

The USB 2.0 HCD implementation is the Extended Host Controller Interface (EHCI). Only EHCI can support high-speed transfers.

However, depending on hardware, different results can be obtained using any one of the 3 included drivers.  If performance is slow using a USB device on Netware, try using a different USB driver.

To change the USB driver, find out which driver is loaded by typing m *.CAD at the console.
Then load Toolbox in order to copy it to the c:\nwserver directory while the server is up. To do that make sure to have the driver somewhere on the server and type the following commands at the server console, following each by pressing the Enter key:
cd c:\
cd nwserver
cd drivers
copy sys:uhcidrv.cad c:\nwserver\drivers

Naturally replace the sys:uhcidrv.cad with the correct path and file name for the driver in question. Once that has been copied, restart the server.