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1 <?xml version='1.0' encoding='UTF-8'?>
2 <!DOCTYPE sections SYSTEM "/dtd/book.dtd">
3
4 <!-- The content of this document is licensed under the CC-BY-SA license -->
5 <!-- See http://creativecommons.org/licenses/by-sa/1.0 -->
6
7 <!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-install-hppa-disk.xml,v 1.5 2004/07/26 09:04:42 dertobi123 Exp $ -->
8
9 <sections>
10 <section>
11 <title>Introduction to Block Devices</title>
12 <subsection>
13 <title>Block Devices</title>
14 <body>
15
16 <p>
17 We'll take a good look at disk-oriented aspects of Gentoo Linux
18 and Linux in general, including Linux filesystems, partitions and block devices.
19 Then, once you're familiar with the ins and outs of disks and filesystems,
20 you'll be guided through the process of setting up partitions and filesystems
21 for your Gentoo Linux installation.
22 </p>
23
24 <p>
25 To begin, we'll introduce <e>block devices</e>. The most famous block device is
26 probably the one that represents the first SCSI HD in a Linux system, namely
27 <path>/dev/sda</path>.
28 </p>
29
30 <p>
31 The block devices above represent an abstract interface to the disk. User
32 programs can use these block devices to interact with your disk without worrying
33 about whether your drives are IDE, SCSI or something else. The program can
34 simply address the storage on the disk as a bunch of contiguous,
35 randomly-accessible 512-byte blocks.
36 </p>
37
38 </body>
39 </subsection>
40 <subsection>
41 <title>Partitions and Slices</title>
42 <body>
43
44 <p>
45 Although it is theoretically possible to use a full disk to house your Linux
46 system, this is almost never done in practice. Instead, full disk block devices
47 are split up in smaller, more manageable block devices. On most systems,
48 these are called <e>partitions</e>. Other architectures use a similar technique,
49 called <e>slices</e>.
50 </p>
51
52 </body>
53 </subsection>
54 </section>
55 <section>
56 <title>Designing a Partitioning Scheme</title>
57 <subsection>
58 <title>How Many and How Big?</title>
59 <body>
60
61 <p>
62 The number of partitions is highly dependent on your environment. For instance,
63 if you have lots of users, you will most likely want to have your
64 <path>/home</path> separate as it increases security and makes backups easier.
65 If you are installing Gentoo to perform as a mailserver, your
66 <path>/var</path> should be separate as all mails are stored inside
67 <path>/var</path>. A good choice of filesystem will then maximise your
68 performance. Gameservers will have a separate <path>/opt</path> as most gaming
69 servers are installed there. The reason is similar for <path>/home</path>:
70 security and backups.
71 </p>
72
73 <p>
74 As you can see, it very much depends on what you want to achieve. Separate
75 partitions or volumes have the following advantages:
76 </p>
77
78 <ul>
79 <li>
80 You can choose the best performing filesystem for each partition or volume
81 </li>
82 <li>
83 Your entire system cannot run out of free space if one defunct tool is
84 continuously writing files to a partition or volume
85 </li>
86 <li>
87 If necessary, file system checks are reduced in time, as multiple checks can
88 be done in parallel (although this advantage is more with multiple disks than
89 it is with multiple partitions)
90 </li>
91 <li>
92 Security can be enhanced by mounting some partitions or volumes read-only,
93 nosuid (setuid bits are ignored), noexec (executable bits are ignored) etc.
94 </li>
95 </ul>
96
97 <p>
98 However, multiple partitions have one big disadvantage: if not configured
99 properly, you might result in having a system with lots
100 of free space on one partition and none on another.
101 </p>
102
103 </body>
104 </subsection>
105 </section>
106 <section>
107 <title>Using fdisk on HPPA to Partition your Disk</title>
108 <body>
109
110 <p>
111 Use <c>fdisk</c> to create the partitions you want:
112 </p>
113
114 <pre caption="Partitioning the disk">
115 # <i>fdisk /dev/sda</i>
116 </pre>
117
118 <p>
119 PALO needs a special partition to work. You have to create a partition of at
120 least 16Mb at the beginning of your disk. The partition type must be of type
121 <e>f0</e> (Linux/PA-RISC boot).
122 </p>
123
124 <impo>
125 If you ignore this and continue without a special PALO partition, your system
126 will stop loving you and fail to start. Also, if your disk is larger than 2Gb,
127 make sure that the boot partition is in the first 2Gb of your disk. PALO is
128 unable to read a kernel after the 2Gb limit.
129 </impo>
130
131 <p>
132 Now that your partitions are created, you can now continue with <uri
133 link="#filesystems">Creating Filesystems</uri>.
134 </p>
135
136 </body>
137 </section>
138 <section id="filesystems">
139 <title>Creating Filesystems</title>
140 <subsection>
141 <title>Introduction</title>
142 <body>
143
144 <p>
145 Now that your partitions are created, it is time to place a filesystem on them.
146 If you don't care about what filesystem to choose and are happy with what we use
147 as default in this handbook, continue with <uri
148 link="#filesystems-apply">Applying a Filesystem to a Partition</uri>.
149 Otherwise read on to learn about the available filesystems...
150 </p>
151
152 </body>
153 </subsection>
154 <subsection>
155 <title>Filesystems?</title>
156 <body>
157
158 <p>
159 Several filesystems are available. Ext2, ext3, XFS and reiserfs are found stable on
160 the HPPA architecture. The others are very experimental.
161 </p>
162
163 <p>
164 <b>ext2</b> is the tried and true Linux filesystem but doesn't have metadata
165 journaling, which means that routine ext2 filesystem checks at startup time can
166 be quite time-consuming. There is now quite a selection of newer-generation
167 journaled filesystems that can be checked for consistency very quickly and are
168 thus generally preferred over their non-journaled counterparts. Journaled
169 filesystems prevent long delays when you boot your system and your filesystem
170 happens to be in an inconsistent state.
171 </p>
172
173 <p>
174 <b>ext3</b> is the journaled version of the ext2 filesystem, providing metadata
175 journaling for fast recovery in addition to other enhanced journaling modes like
176 full data and ordered data journaling. ext3 is a very good and reliable
177 filesystem. It has an additional hashed b-tree indexing option that enables
178 high performance in almost all situations. In short, ext3 is an excellent
179 filesystem.
180 </p>
181
182 <p>
183 <b>ReiserFS</b> is a B*-tree based filesystem that has very good overall
184 performance and greatly outperforms both ext2 and ext3 when dealing with small
185 files (files less than 4k), often by a factor of 10x-15x. ReiserFS also scales
186 extremely well and has metadata journaling. As of kernel 2.4.18+, ReiserFS is
187 solid and usable as both general-purpose filesystem and for extreme cases such
188 as the creation of large filesystems, the use of many small files, very large
189 files and directories containing tens of thousands of files.
190 </p>
191
192 <p>
193 <b>XFS</b> is a filesystem with metadata journaling which comes with a robust
194 feature-set and is optimized for scalability. We only recommend using this
195 filesystem on Linux systems with high-end SCSI and/or fibre channel storage and
196 an uninterruptible power supply. Because XFS aggressively caches in-transit data
197 in RAM, improperly designed programs (those that don't take proper precautions
198 when writing files to disk and there are quite a few of them) can lose a good
199 deal of data if the system goes down unexpectedly.
200 </p>
201
202 <p>
203 <b>JFS</b> is IBM's high-performance journaling filesystem. It has recently
204 become production-ready and there hasn't been a sufficient track record to
205 comment positively nor negatively on its general stability at this point.
206 </p>
207
208 </body>
209 </subsection>
210 <subsection id="filesystems-apply">
211 <title>Applying a Filesystem to a Partition</title>
212 <body>
213
214 <p>
215 To create a filesystem on a partition or volume, there are tools available for
216 each possible filesystem:
217 </p>
218
219 <table>
220 <tr>
221 <th>Filesystem</th>
222 <th>Creation Command</th>
223 </tr>
224 <tr>
225 <ti>ext2</ti>
226 <ti><c>mke2fs</c></ti>
227 </tr>
228 <tr>
229 <ti>ext3</ti>
230 <ti><c>mke2fs -j</c></ti>
231 </tr>
232 <tr>
233 <ti>reiserfs</ti>
234 <ti><c>mkreiserfs</c></ti>
235 </tr>
236 <tr>
237 <ti>xfs</ti>
238 <ti><c>mkfs.xfs</c></ti>
239 </tr>
240 <tr>
241 <ti>jfs</ti>
242 <ti><c>mkfs.jfs</c></ti>
243 </tr>
244 </table>
245
246 <p>
247 For instance, to have the boot partition (<path>/dev/sda2</path> in our
248 example) in ext2 and the root partition (<path>/dev/sda4</path> in our example)
249 in ext3 (as in our example), you would use:
250 </p>
251
252 <pre caption="Applying a filesystem on a partition">
253 # <i>mke2fs /dev/sda2</i>
254 # <i>mke2fs -j /dev/sda4</i>
255 </pre>
256
257 <p>
258 Now create the filesystems on your newly created partitions (or logical
259 volumes).
260 </p>
261
262 </body>
263 </subsection>
264 <subsection>
265 <title>Activating the Swap Partition</title>
266 <body>
267
268 <p>
269 <c>mkswap</c> is the command that is used to initialize swap partitions:
270 </p>
271
272 <pre caption="Creating a Swap signature">
273 # <i>mkswap /dev/sda3</i>
274 </pre>
275
276 <p>
277 To activate the swap partition, use <c>swapon</c>:
278 </p>
279
280 <pre caption="Activating the swap partition">
281 # <i>swapon /dev/sda3</i>
282 </pre>
283
284 <p>
285 Create and activate the swap now.
286 </p>
287
288 </body>
289 </subsection>
290 </section>
291 <section>
292 <title>Mounting</title>
293 <body>
294
295 <p>
296 Now that your partitions are initialized and are housing a filesystem, it is
297 time to mount those partitions. Use the <c>mount</c> command. Don't forget to
298 create the necessary mount directories for every partition you created. As an
299 example we mount the root and boot partition:
300 </p>
301
302 <pre caption="Mounting partitions">
303 # <i>mount /dev/sda4 /mnt/gentoo</i>
304 # <i>mkdir /mnt/gentoo/boot</i>
305 # <i>mount /dev/sda2 /mnt/gentoo/boot</i>
306 </pre>
307
308 <note>
309 If you want your <path>/tmp</path> to reside on a separate partition, be sure to
310 change its permissions after mounting: <c>chmod 1777 /mnt/gentoo/tmp</c>. This
311 also holds for <path>/var/tmp</path>.
312 </note>
313
314 <p>
315 We will also have to mount the proc filesystem (a virtual interface with the
316 kernel) on <path>/proc</path>. But first we will need to place our files on the partitions.
317 </p>
318
319 <p>
320 Continue with <uri link="?part=1&amp;chap=5">Installing the Gentoo
321 Installation Files</uri>.
322 </p>
323
324 </body>
325 </section>
326 </sections>

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