ts_categorize-isolate.dita@ 105293

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1	<?xml version='1.0' encoding='UTF-8'?>
2	<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
3	<topic xml:lang="en-us" id="ts_categorize-isolate">
4	<title>Categorizing and Isolating Problems</title>
5
6	<body>
7	<p>
8	More often than not, a virtualized guest behaves like a physical
9	system. Any problems that a physical machine would encounter, a
10	virtual machine will encounter as well. If, for example,
11	Internet connectivity is lost due to external issues, virtual
12	machines will be affected just as much as physical ones.
13	</p>
14	<p>
15	If a true <ph conkeyref="vbox-conkeyref-phrases/product-name"/> problem is encountered, it helps to
16	categorize and isolate the problem first. Here are some of the
17	questions that should be answered before reporting a problem:
18	</p>
19	<ul>
20	<li>
21	<p>
22	Is the problem specific to a certain guest OS? Or a specific
23	release of a guest OS? Especially with Linux guest related
24	problems, the issue may be specific to a certain
25	distribution and version of Linux.
26	</p>
27	</li>
28	<li>
29	<p>
30	Is the problem specific to a certain host OS? Problems are
31	usually not host OS specific, because most of the
32	<ph conkeyref="vbox-conkeyref-phrases/product-name"/> code base is shared across all supported
33	platforms, but especially in the areas of networking and USB
34	support, there are significant differences between host
35	platforms. Some GUI related issues are also host specific.
36	</p>
37	</li>
38	<li>
39	<p>
40	Is the problem specific to certain host hardware? This
41	category of issues is typically related to the host CPU.
42	Because of significant differences between VT-x and AMD-V,
43	problems may be specific to one or the other technology. The
44	exact CPU model may also make a difference because different
45	CPUs support different features, which may affect certain
46	aspects of guest CPU operation.
47	</p>
48	</li>
49	<li>
50	<p>
51	Is the problem specific to guest SMP? That is, is it related
52	to the number of virtual CPUs (VCPUs) in the guest? Using
53	more than one CPU usually significantly affects the internal
54	operation of a guest OS.
55	</p>
56	</li>
57	<li>
58	<p>
59	Is the problem specific to the Guest Additions? In some
60	cases, this is obvious, such as a shared folders problem. In
61	other cases such as display problems, it may be less
62	obvious. If the problem is Guest Additions specific, is it
63	also specific to a certain version of the Guest Additions?
64	</p>
65	</li>
66	<li>
67	<p>
68	Is the problem specific to a certain environment? Some
69	problems are related to a particular environment external to
70	the VM. This usually involves network setup. Certain
71	configurations of external servers such as DHCP or PXE may
72	expose problems which do not occur with other, similar
73	servers.
74	</p>
75	</li>
76	<li>
77	<p>
78	Is the problem a regression? Knowing that an issue is a
79	regression usually makes it significantly easier to find the
80	solution. In this case, it is crucial to know which version
81	is affected and which is not.
82	</p>
83	</li>
84	</ul>
85	</body>
86
87	</topic>

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