User`s manual

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Chapter J - Using Microsoft Windows NT
J.4.3 Using the Hot-Plug Function with RAID Host Drives
In order to be able to use the Hot-Plug function under Windows NT, it is necessary to i n-
stall the so-called filter driver GDTF.SYS in addition to the GDTX.SYS driver. (Note: The
Hot-Plug function is carried out with the monitoring program GDTMON. GDTF.SYS and
GDTMON.EXE are part of the GDT Windows NT disk).
To do so, Windows NT must have already been set up and the GDT controller installed.
I. Switch to the main group Windows NT Setup.
II. From Options select Add/Remove SCSI Adapters.
III. Remove the current GDT Cache and Disk Array Controller driver with the Remove option.
IV. Then choose Add and Other to integrate the driver for the GDT controller.
V. Now insert the GDT driver disk Windows NT. Select GDT Cache and Disk Array Controller .
Choose Install and then New .
VI. After both drivers (GDTX.SYS and GDTF.SYS) have been read, close this application and
exit WindowsNT.
At the next Windows NT boot, GDTMON.EXE can be loaded and the Hot-Plug function b e-
comes available.
J.4.4 Installation of a new GDTX.SYS Driver Version
If it should become necessary to install a new version of the GDTX.SYS driver, the proc e-
dure is exactly the same as described in section J.4.3. The new driver is activated after exi t-
ing Windows NT and rebooting the system.
J.5 Installation of a Removable Hard Disk
Removable hard disks (e.g. SyQuest, or magneto optical devices, MODs) are controlled by
the GDT controller in two fundamentally different modes:
Mode 1:
The removable hard disk is treated like a normal hard disk. The data passes through
the cache of the GDT controller and the media needs to be initialized with GDTSETUP.
Mode 2:
The removable hard disk is handled as a Raw Device. This means that the removable
device is directly controlled by Windows NT without any further interaction of the contro l-
ler. Consequently, the data is not cached by the GDT cache and the media does not need to
be initialized with GDTSETUP. The advantage of mode 1 lies in a decisively better perfor m-
ance due to caching. On the other hand, the relatively complicated procedure of media
changing presents a disadvantage. The opposite is true when adopting mode 2: The media
change is easy and the media are compatible with other disk controllers (e.g. NCR). The
performance is rather low since the data cannot be cached on the GDT co ntroller.
To install a removable hard disk as a Raw Device, the media must not be initialized with
GDTSETUP and the device must be set to a SCSI-ID equal to or greater than 2. In addition,
the parameters of the GDT driver GDTX.SYS need to be configured differently in the Wi n-
dows NT Registry
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\gdtx\Parameters\Device
To do so, follow these instructions: