2. What are jumpers for SCSI ID on GVP card?

You mean the host adapter? Traditionally, the host adapter has the SCSI ID 7 which typically cannot be changed. For the drive, the SCSI ID can be selected with the A0..A2 jumpers.

3. What are these jumpers under Quantum ProDrive LPS 50MB:

SS: Seek test (do not set jumper, only for testing)
WS: Wait spin. If jumpered, the drive starts delayed to avoid a breakdown of the power during startup.
EP: Enable parity. Allows usage on older systems which do not generate a parity signal. If jumpered, the parity is tested.

I mean these: http://amiga.resource.cx/exp/impact2000hc8
J4 -    SCSI drive
J10-J12 -    SCSI ID

Would you explain more about A0-A2 jumpers?

Thomas was referring to the jumpers labelled A0-A2 on the drive in your attached picture. With the jumper on A2 your drive is currently set to ID = 4. No worries about that however the manual for the GVP card states that the drive should be set to ID = 0 (no jumpers on A0-A2) and resistor packs removed, which they are.

I'm not sure why there are SCSI ID jumpers on the GVP card. It should autoconfig as ID=7. I would just leave those jumpers empty and try it.

J4 is shown as "Autobooting" but the manual describes nothing else for it.

Maximum size, IIRC, I think is 4GB but that assumes up to date GVP ROMs and OS 3.1 or maybe even OS 3.5 minimum. Your LPS 50MB drive should be fine.

Peter

I'm not sure why there are SCSI ID jumpers on the GVP card. It should autoconfig as ID=7. I would just leave those jumpers empty and try it.

There are SCSI ID jumpers because there are situations where you don't want to use the default ID of 7.

You can for example create a network of computers using SCSI and each host adaptor would need a unique ID. SCSI is a bit like commodore serial bus and IEEE where each device can talk to any other device and there is nothing special about the computer initiating a request.

But if you just have a hard drive and a host adaptor then 0 for the hard drive and 7 for the host adaptor is the standard.

I have this GVP Impact A500 HD8+ Series II

I ques it is prety much same card but for A500.

I have 4gb hard drive connected to it.

I have spend countless hours to tryint to get working old SCSI drive and tryin to get them work with my Trump Card Pro. I ended up to bought Buddha IDE controller.

I you want to keep SCSI, I would suggest you to get this :

http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=1264

I you want to keep SCSI, I would suggest you to get this :

http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=1264

+1

Using HDtoolbox or something else?

Just bought 2940UW but it can't find my Quantum ProDrive LPS 50MB SCSI, stuck in Scanning SCSI ID after pressing Ctrl+A

Finding working SCSI disk for amiga can be a painfull experience,

You really should buy that amigakit SD2SCSI adapter, if you want to get something wich has some future.

I have "endless" source of used scsi disks because of my job and I can say that anything wich is even remotely modern will not work with old amiga scsi controllers.

You will end up to have some 5-10 scsi disks wich don't work with your amiga. You should look something wich has 4gb max capasity and 50 pin connector. Most of them are alreday broken when you get them.