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1 swift 1.1 <?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 neysx 1.3 <!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-install-ppc64-disk.xml,v 1.2 2004/08/19 07:58:56 swift Exp $ -->
8 swift 1.1
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 IDE drive in a Linux system, namely
27     <path>/dev/hda</path>. If your system uses SCSI drives, then your first hard
28     drive would be <path>/dev/sda</path>. Serial ATA drives are also
29     <path>/dev/sda</path> even if they are IDE drives.
30     </p>
31    
32     <p>
33     The block devices above represent an abstract interface to the disk. User
34     programs can use these block devices to interact with your disk without worrying
35     about whether your drives are IDE, SCSI or something else. The program can
36     simply address the storage on the disk as a bunch of contiguous,
37     randomly-accessible 512-byte blocks.
38     </p>
39    
40     </body>
41     </subsection>
42     <subsection>
43     <title>Partitions and Slices</title>
44     <body>
45    
46     <p>
47     Although it is theoretically possible to use a full disk to house your Linux
48     system, this is almost never done in practice. Instead, full disk block devices
49     are split up in smaller, more manageable block devices. On most systems,
50     these are called <e>partitions</e>. Other architectures use a similar technique,
51     called <e>slices</e>.
52     </p>
53    
54     </body>
55     </subsection>
56     </section>
57     <section>
58     <title>Designing a Partitioning Scheme</title>
59     <subsection>
60     <title>Default Partitioning Scheme</title>
61     <body>
62    
63     <p>
64     If you are not interested in drawing up a partitioning scheme for your system,
65     you can use the partitioning scheme we use throughout this book:
66     </p>
67    
68     <table>
69     <tr>
70     <th>Partition</th>
71     <th>Filesystem</th>
72     <th>Size</th>
73     <th>Description</th>
74     </tr>
75     <tr>
76     <ti><path>/dev/sda1</path></ti>
77     <ti>Partition map</ti>
78     <ti>31.5k</ti>
79     <ti>Partition map</ti>
80     </tr>
81     <tr>
82     <ti><path>/dev/sda2</path></ti>
83     <ti>(bootstrap)</ti>
84     <ti>800k</ti>
85     <ti>Apple_Bootstrap</ti>
86     </tr>
87     <tr>
88     <ti><path>/dev/sda3</path></ti>
89     <ti>(swap)</ti>
90     <ti>512M</ti>
91     <ti>Swap partition</ti>
92     </tr>
93     <tr>
94     <ti><path>/dev/sda4</path></ti>
95     <ti>ext3</ti>
96     <ti>Rest of the disk</ti>
97     <ti>Root partition</ti>
98     </tr>
99     </table>
100    
101     <note>
102     There are some partitions named like this: <path>Apple_Driver43,
103     Apple_Driver_ATA, Apple_FWDriver, Apple_Driver_IOKit,
104     Apple_Patches</path>. If you are not planning to use MacOS 9 you can
105     delete them, because MacOS X and Linux don't need them.
106     </note>
107    
108     <p>
109     If you are interested in knowing how big a partition should be, or even how
110     many partitions you need, read on. Otherwise continue now with
111     <uri link="#mac-fdisk">Apple G5: Using mac-fdisk to Partition your
112     Disk</uri> or <uri link="#fdisk">IBM pSeries: using fdisk to Partition
113     your Disk</uri>
114     </p>
115    
116     </body>
117     </subsection>
118     <subsection>
119     <title>How Many and How Big?</title>
120     <body>
121    
122     <p>
123     The number of partitions is highly dependent on your environment. For instance,
124     if you have lots of users, you will most likely want to have your
125     <path>/home</path> separate as it increases security and makes backups easier.
126     If you are installing Gentoo to perform as a mailserver, your
127     <path>/var</path> should be separate as all mails are stored inside
128     <path>/var</path>. A good choice of filesystem will then maximise your
129     performance. Gameservers will have a separate <path>/opt</path> as most gaming
130     servers are installed there. The reason is similar for <path>/home</path>:
131     security and backups.
132     </p>
133    
134     <p>
135     As you can see, it very much depends on what you want to achieve. Separate
136     partitions or volumes have the following advantages:
137     </p>
138    
139     <ul>
140     <li>
141 neysx 1.3 You can choose the best performing filesystem for each partition or volume
142 swift 1.1 </li>
143     <li>
144     Your entire system cannot run out of free space if one defunct tool is
145     continuously writing files to a partition or volume
146     </li>
147     <li>
148     If necessary, file system checks are reduced in time, as multiple checks can
149     be done in parallel (although this advantage is more with multiple disks than
150     it is with multiple partitions)
151     </li>
152     <li>
153     Security can be enhanced by mounting some partitions or volumes read-only,
154     nosuid (setuid bits are ignored), noexec (executable bits are ignored) etc.
155     </li>
156     </ul>
157    
158     <p>
159     However, multiple partitions have one big disadvantage: if not configured
160     properly, you might result in having a system with lots
161     of free space on one partition and none on another.
162     </p>
163    
164     </body>
165     </subsection>
166     </section>
167     <section id="mac-fdisk">
168     <title>Default: Using mac-fdisk (Apple G5) Partition your Disk</title>
169     <body>
170    
171     <p>
172     At this point, create your partitions using <c>mac-fdisk</c>:
173     </p>
174    
175     <pre caption="Starting mac-fdisk">
176 swift 1.2 # <i>mac-fdisk /dev/sda</i>
177 swift 1.1 </pre>
178    
179     <p>
180     First delete the partitions you have cleared previously to make room for your
181     Linux partitions. Use <c>d</c> in <c>mac-fdisk</c> to delete those partition(s).
182     It will ask for the partition number to delete.
183     </p>
184    
185     <p>
186     Second, create an <e>Apple_Bootstrap</e> partition by using <c>b</c>. It will
187     ask for what block you want to start. Enter the number of your first free
188     partition, followed by a <c>p</c>. For instance this is <c>1p</c>.
189     </p>
190    
191     <note>
192     This partition is <e>not</e> a "boot" partition. It is not used by Linux at all;
193     you don't have to place any filesystem on it and you should never mount it. PPC
194     users don't need a an extra partition for <path>/boot</path>.
195     </note>
196    
197     <p>
198     Now create a swap partition by pressing <c>c</c>. Again <c>mac-fdisk</c> will
199     ask for what block you want to start this partition from. As we used <c>1</c>
200     before to create the Apple_Bootstrap partition, you now have to enter
201     <c>2p</c>. When you're asked for the size, enter <c>512M</c> (or whatever size
202     you want -- 512MB is recommended though). When asked for a name, enter <c>swap</c>
203     (mandatory).
204     </p>
205    
206     <p>
207     To create the root partition, enter <c>c</c>, followed by <c>3p</c> to select
208     from what block the root partition should start. When asked for the size, enter
209     <c>3p</c> again. <c>mac-fdisk</c> will interpret this as "Use all available
210     space". When asked for the name, enter <c>root</c> (mandatory).
211     </p>
212    
213     <p>
214     To finish up, write the partition to the disk using <c>w</c> and <c>q</c> to
215     quit <c>mac-fdisk</c>.
216     </p>
217    
218     <p>
219     Now that your partitions are created, you can now continue with <uri
220     link="#filesystems">Creating Filesystems</uri>.
221     </p>
222    
223     </body>
224     </section>
225     <section id="fdisk">
226     <title>IBM pSeries: using fdisk to Partition your Disk</title>
227     <subsection>
228     <body>
229    
230     <p>
231     The following parts explain how to create the example partition layout
232     described previously, namely:
233     </p>
234    
235     <table>
236     <tr>
237     <th>Partition</th>
238     <th>Description</th>
239     </tr>
240     <tr>
241     <ti><path>/dev/sda1</path></ti>
242     <ti>PPC PReP Boot partition</ti>
243     </tr>
244     <tr>
245     <ti><path>/dev/sda2</path></ti>
246     <ti>Swap partition</ti>
247     </tr>
248     <tr>
249     <ti><path>/dev/sda3</path></ti>
250     <ti>Root partition</ti>
251     </tr>
252     </table>
253    
254     <p>
255     Change your partition layout according to your own will.
256     </p>
257    
258     </body>
259     </subsection>
260     <subsection>
261     <title>Viewing the Current Partition Layout</title>
262     <body>
263    
264     <p>
265     <c>fdisk</c> is a popular and powerful tool to split your disk into
266     partitions. Fire up <c>fdisk</c> on your disk (in our example, we
267     use <path>/dev/sda</path>):
268     </p>
269    
270     <pre caption="Starting fdisk">
271     # <i>fdisk /dev/sda</i>
272     </pre>
273    
274     <p>
275     Once in <c>fdisk</c>, you'll be greeted with a prompt that looks like
276     this:
277     </p>
278    
279     <pre caption="fdisk prompt">
280     Command (m for help):
281     </pre>
282    
283     <p>
284     Type <c>p</c> to display your disk's current partition configuration:
285     </p>
286    
287     <pre caption="An example partition configuration">
288     Command (m for help): p
289    
290     Disk /dev/sda: 30.7 GB, 30750031872 bytes
291     141 heads, 63 sectors/track, 6761 cylinders
292     Units = cylinders of 8883 * 512 = 4548096 bytes
293    
294     Device Boot Start End Blocks Id System
295     /dev/hdb1 1 12 53266+ 83 Linux
296     /dev/hdb2 13 233 981571+ 82 Linux swap
297     /dev/hdb3 234 674 1958701+ 83 Linux
298     /dev/hdb4 675 6761 27035410+ 5 Extended
299     /dev/hdb5 675 2874 9771268+ 83 Linux
300     /dev/hdb6 2875 2919 199836 83 Linux
301     /dev/hdb7 2920 3008 395262 83 Linux
302     /dev/hdb8 3009 6761 16668918 83 Linux
303    
304     Command (m for help):
305     </pre>
306    
307     <p>
308     This particular disk is configured to house seven Linux filesystems
309     (each with a corresponding partition listed as "Linux") as well as a
310     swap partition (listed as "Linux swap").
311     </p>
312    
313     </body>
314     </subsection>
315     <subsection>
316     <title>Removing all Partitions</title>
317     <body>
318    
319     <p>
320     We will first remove all existing partitions from the disk. Type
321     <c>d</c> to delete a partition. For instance, to delete an existing
322     <path>/dev/sda1</path>:
323     </p>
324    
325     <note>If you don't want to delete all partitions just delete those you
326     want to delete. At this point the author recommends a backup of your
327     data to avoid the lose of it.
328     </note>
329    
330     <pre caption="Deleting a partition">
331     Command (m for help): <i>d</i>
332     Partition number (1-4): <i>1</i>
333     </pre>
334    
335     <p>
336     The partition has been scheduled for deletion. It will no longer show up
337     if you type <c>p</c>, but it will not be erased until your changes have
338     been saved. If you made a mistake and want to abort without saving your
339     changes, type <c>q</c> immediately and hit enter and your partition will
340     not be deleted.
341     </p>
342    
343     <p>
344     Now, assuming that you do indeed want to wipe out all the partitions on
345     your system, repeatedly type <c>p</c> to print out a partition listing
346     and then type <c>d</c> and the number of the partition to delete it.
347     Eventually, you'll end up with a partition table with nothing in it:
348     </p>
349    
350     <pre caption="An empty partition table">
351     Disk /dev/sda: 30.7 GB, 30750031872 bytes
352     141 heads, 63 sectors/track, 6761 cylinders
353     Units = cylinders of 8883 * 512 = 4548096 bytes
354    
355     Device Boot Start End Blocks Id System
356    
357     Command (m for help):
358     </pre>
359    
360     <p>
361     Now that the in-memory partition table is empty, we're ready to create
362     the partitions. We will use a default partitioning scheme as discussed
363     previously. Of course, don't follow these instructions to the letter if
364     you don't want the same partitioning scheme!
365     </p>
366    
367     </body>
368     </subsection>
369     <subsection>
370     <title>Creating the PPC PReP boot partition</title>
371     <body>
372    
373     <p>
374     We first create a small PReP boot partition. Type <c>n</c> to create a new
375     partition, then <c>p</c> to select a primary partition, followed by
376     <c>1</c> to select the first primary partition. When prompted for the
377     first cylinder, hit enter. When prompted for the last cylinder, type
378     <c>+7M</c> to create a partition 7 Mbyte in size. After you've done
379     this, type <c>t</c> to set the partition type, <c>1</c> to select the
380     partition you just created and then type in <c>41</c> to set the
381     partition type to "PPC PReP Boot".
382     </p>
383    
384     <note>
385     The PReP partition has to be smaller than 8 MByte!
386     </note>
387    
388     <pre caption="Crating to PReP boot partition">
389     Command (m for help): <i>p</i>
390    
391     Disk /dev/sda: 30.7 GB, 30750031872 bytes
392     141 heads, 63 sectors/track, 6761 cylinders
393     Units = cylinders of 8883 * 512 = 4548096 bytes
394    
395     Device Boot Start End Blocks Id System
396    
397     Command (m for help): <i>n</i>
398     Command action
399     e extended
400     p primary partition (1-4)
401     <i>p</i>
402     Partition number (1-4): <i>1</i>
403     First cylinder (1-6761, default 1):
404     Using default value 1
405     Last cylinder or +size or +sizeM or +sizeK (1-6761, default
406     6761): <i>+8M</i>
407    
408     Command (m for help): <i>t</i>
409     Selected partition 1
410     Hex code (type L to list codes): <i>41</i>
411     Changed system type of partition 1 to 41 (PPC PReP Boot)
412    
413     Command (m for help):
414     </pre>
415    
416     <p>
417     Now, when you type <c>p</c>, you should see the following partition
418     printout:
419     </p>
420    
421     <pre caption="Created boot partition">
422     Command (m for help): <i>p</i>
423    
424     Disk /dev/sda: 30.7 GB, 30750031872 bytes
425     141 heads, 63 sectors/track, 6761 cylinders
426     Units = cylinders of 8883 * 512 = 4548096 bytes
427    
428     Device Boot Start End Blocks Id System
429     /dev/hdb1 1 3 13293 41 PPC PReP Boot
430    
431     Command (m for help):
432     </pre>
433     </body>
434     </subsection>
435     <subsection>
436     <title>Creating the Swap Partition</title>
437     <body>
438    
439     <p>
440     Let's now create the swap partition. To do this, type <c>n</c> to create
441     a new partition, then <c>p</c> to tell fdisk that you want a primary
442     partition. Then type <c>2</c> to create the second primary partition,
443 swift 1.2 <path>/dev/sda2</path> in our case. When prompted for the first
444 swift 1.1 cylinder, hit enter. When prompted for the last cylinder, type
445     <c>+512M</c> to create a partition 512MB in size. After you've done
446     this, type <c>t</c> to set the partition type, <c>2</c> to select the
447     partition you just created and then type in <c>82</c> to set the
448     partition type to "Linux Swap". After completing these steps, typing
449     <c>p</c> should display a partition table that looks similar to this:
450     </p>
451    
452     <pre caption="Partition listing after creating a swap partition">
453     Command (m for help): <i>p</i>
454    
455     Disk /dev/sda: 30.7 GB, 30750031872 bytes
456     141 heads, 63 sectors/track, 6761 cylinders
457     Units = cylinders of 8883 * 512 = 4548096 bytes
458    
459     Device Boot Start End Blocks Id System
460     /dev/hdb1 1 3 13293 41 PPC PReP Boot
461     /dev/hdb2 4 117 506331 82 Linux swap
462    
463     Command (m for help):
464     </pre>
465    
466     </body>
467     </subsection>
468     <subsection>
469     <title>Creating the Root Partition</title>
470     <body>
471    
472     <p>
473     Finally, let's create the root partition. To do this, type <c>n</c> to
474     create a new partition, then <c>p</c> to tell fdisk that you want a
475     primary partition. Then type <c>3</c> to create the third primary
476     partition, <path>/dev/sda3</path> in our case. When prompted for the
477     first cylinder, hit enter. When prompted for the last cylinder, hit
478     enter to create a partition that takes up the rest of the remaining
479     space on your disk. After completing these steps, typing <c>p</c> should
480     display a partition table that looks similar to this:
481     </p>
482    
483     <pre caption="Partition listing after creating the root partition">
484     Command (m for help): p
485    
486     Disk /dev/sda: 30.7 GB, 30750031872 bytes
487     141 heads, 63 sectors/track, 6761 cylinders
488     Units = cylinders of 8883 * 512 = 4548096 bytes
489    
490     Device Boot Start End Blocks Id System
491     /dev/hdb1 1 3 13293 41 PPC PReP Boot
492     /dev/hdb2 4 117 506331 82 Linux swap
493     /dev/hdb3 118 6761 29509326 83 Linux
494    
495     Command (m for help):
496     </pre>
497     </body>
498     </subsection>
499     <subsection>
500     <title>Saving the Partition Layout</title>
501     <body>
502    
503     <p>
504     To save the partition layout and exit <c>fdisk</c>, type <c>w</c>.
505     </p>
506    
507     <pre caption="Save and exit fdisk">
508     Command (m for help): <i>w</i>
509     </pre>
510    
511     <p>
512     Now that your partitions are created, you can now continue with <uri
513     link="#filesystems">Creating Filesystems</uri>.
514     </p>
515    
516     </body>
517     </subsection>
518     <subsection>
519     <title>Filesystems?</title>
520     <body>
521    
522     <note>
523     Several filesystems are available. Ext2 and ext3 are found stable on the
524     PPC64 architecture, reiserfs and xfs are in experimental stage. jfs is
525     unsupported.
526     </note>
527    
528     <p>
529     <b>ext2</b> is the tried and true Linux filesystem but doesn't have metadata
530     journaling, which means that routine ext2 filesystem checks at startup time can
531     be quite time-consuming. There is now quite a selection of newer-generation
532     journaled filesystems that can be checked for consistency very quickly and are
533     thus generally preferred over their non-journaled counterparts. Journaled
534     filesystems prevent long delays when you boot your system and your filesystem
535     happens to be in an inconsistent state.
536     </p>
537    
538     <p>
539     <b>ext3</b> is the journaled version of the ext2 filesystem, providing metadata
540     journaling for fast recovery in addition to other enhanced journaling modes like
541     full data and ordered data journaling. ext3 is a very good and reliable
542     filesystem. It has an additional hashed b-tree indexing option that enables
543     high performance in almost all situations. In short, ext3 is an excellent
544     filesystem.
545     </p>
546    
547     <p>
548     <b>ReiserFS</b> is a B*-tree based filesystem that has very good overall
549     performance and greatly outperforms both ext2 and ext3 when dealing with small
550     files (files less than 4k), often by a factor of 10x-15x. ReiserFS also scales
551     extremely well and has metadata journaling. As of kernel 2.4.18+, ReiserFS is
552     solid and usable as both general-purpose filesystem and for extreme cases such
553     as the creation of large filesystems, the use of many small files, very large
554     files and directories containing tens of thousands of files.
555     </p>
556    
557     <p>
558     <b>XFS</b> is a filesystem with metadata journaling that is fully supported
559     under Gentoo Linux's xfs-sources kernel. It comes with a robust feature-set and
560     is optimized for scalability. We only recommend using this filesystem on Linux
561     systems with high-end SCSI and/or fibre channel storage and a uninterruptible
562     power supply. Because XFS aggressively caches in-transit data in RAM, improperly
563     designed programs (those that don't take proper precautions when writing files
564     to disk and there are quite a few of them) can lose a good deal of data if the
565     system goes down unexpectedly.
566     </p>
567    
568     <p>
569     <b>JFS</b> is IBM's high-performance journaling filesystem. It has recently
570     become production-ready and there hasn't been a sufficient track record to
571     comment positively nor negatively on its general stability at this point.
572     </p>
573    
574     </body>
575     </subsection>
576     <subsection id="filesystems-apply">
577     <title>Applying a Filesystem to a Partition</title>
578     <body>
579    
580     <p>
581     To create a filesystem on a partition or volume, there are tools available for
582     each possible filesystem:
583     </p>
584    
585     <table>
586     <tr>
587     <th>Filesystem</th>
588     <th>Creation Command</th>
589     </tr>
590     <tr>
591     <ti>ext2</ti>
592     <ti><c>mke2fs</c></ti>
593     </tr>
594     <tr>
595     <ti>ext3</ti>
596     <ti><c>mke2fs -j</c></ti>
597     </tr>
598     <tr>
599     <ti>reiserfs</ti>
600     <ti><c>mkreiserfs</c></ti>
601     </tr>
602     <tr>
603     <ti>xfs</ti>
604     <ti><c>mkfs.xfs</c></ti>
605     </tr>
606     <tr>
607     <ti>jfs</ti>
608     <ti><c>mkfs.jfs</c></ti>
609     </tr>
610     </table>
611    
612     <p>
613     For instance, to have the root partition (<path>/dev/sda4</path> in our example)
614     in ext3 (as in our example), you would use:
615     </p>
616    
617     <pre caption="Applying a filesystem on a partition">
618     # <i>mke2fs -j /dev/sda4</i>
619     </pre>
620    
621     <p>
622     Now create the filesystems on your newly created partitions (or logical
623     volumes).
624     </p>
625    
626     </body>
627     </subsection>
628     <subsection>
629     <title>Activating the Swap Partition</title>
630     <body>
631    
632     <p>
633     <c>mkswap</c> is the command that is used to initialize swap partitions:
634     </p>
635    
636     <pre caption="Creating a Swap signature">
637     # <i>mkswap /dev/sda3</i>
638     </pre>
639    
640     <p>
641     To activate the swap partition, use <c>swapon</c>:
642     </p>
643    
644     <pre caption="Activating the swap partition">
645     # <i>swapon /dev/sda3</i>
646     </pre>
647    
648     <p>
649     Create and activate the swap now.
650     </p>
651    
652     </body>
653     </subsection>
654     </section>
655     <section>
656     <title>Mounting</title>
657     <body>
658    
659     <p>
660     Now that your partitions are initialized and are housing a filesystem, it is
661     time to mount those partitions. Use the <c>mount</c> command. Don't forget to
662     create the necessary mount directories for every partition you created. As an
663     example we create a mount-point and mount the root and boot partition:
664     </p>
665    
666     <pre caption="Mounting partitions">
667     # <i>mkdir /mnt/gentoo</i>
668     # <i>mount /dev/sda4 /mnt/gentoo</i>
669     </pre>
670    
671     <note>
672     If you want your <path>/tmp</path> to reside on a separate partition, be sure to
673     change its permissions after mounting: <c>chmod 1777 /mnt/gentoo/tmp</c>. This
674     also holds for <path>/var/tmp</path>.
675     </note>
676    
677     <p>
678     Finally we have to create the <path>/dev</path> files in our new home, which is
679     needed during the bootloader installation. This could be done by "bind"-mapping
680     the <path>/dev</path>-filesystem from the LiveCD:
681     </p>
682    
683     <pre caption="Bind-mounting the /dev-filesystem">
684     # <i>mkdir /mnt/gentoo/dev</i>
685     # <i>mount -o bind /dev /mnt/gentoo/dev</i>
686     </pre>
687    
688     <p>
689     We will also have to mount the proc filesystem (a virtual interface with the
690     kernel) on <path>/proc</path>. But first we will need to place our files on the partitions.
691     </p>
692    
693     <p>
694     Continue with <uri link="?part=1&amp;chap=5">Installing the Gentoo
695     Installation Files</uri>.
696     </p>
697    
698     </body>
699     </section>
700     </sections>

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