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1<?xml version='1.0' encoding='UTF-8'?> 1<?xml version='1.0' encoding='UTF-8'?>
2<!DOCTYPE sections SYSTEM "/dtd/book.dtd"> 2<!DOCTYPE sections SYSTEM "/dtd/book.dtd">
3 3
4<!-- The content of this document is licensed under the CC-BY-SA license --> 4<!-- The content of this document is licensed under the CC-BY-SA license -->
5<!-- See http://creativecommons.org/licenses/by-sa/2.5 --> 5<!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
6 6
7<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-install-alpha-disk.xml,v 1.22 2006/08/30 22:52:28 nightmorph Exp $ --> 7<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-install-alpha-disk.xml,v 1.23 2006/11/02 20:49:38 nightmorph Exp $ -->
8 8
9<sections> 9<sections>
10 10
11<version>7.0</version> 11<version>7.1</version>
12<date>2006-08-30</date> 12<date>2006-11-02</date>
13 13
14<section> 14<section>
15<title>Introduction to Block Devices</title> 15<title>Introduction to Block Devices</title>
16<subsection> 16<subsection>
17<title>Block Devices</title> 17<title>Block Devices</title>
18<body> 18<body>
19 19
20<p> 20<p>
21We'll take a good look at disk-oriented aspects of Gentoo Linux 21We'll take a good look at disk-oriented aspects of Gentoo Linux
22and Linux in general, including Linux filesystems, partitions and block devices. 22and Linux in general, including Linux filesystems, partitions and block devices.
23Then, once you're familiar with the ins and outs of disks and filesystems, 23Then, once you're familiar with the ins and outs of disks and filesystems,
24you'll be guided through the process of setting up partitions and filesystems 24you'll be guided through the process of setting up partitions and filesystems
25for your Gentoo Linux installation. 25for your Gentoo Linux installation.
26</p> 26</p>
27 27
650partitions. 650partitions.
651</note> 651</note>
652 652
653<p> 653<p>
654<b>ext2</b> is the tried and true Linux filesystem but doesn't have metadata 654<b>ext2</b> is the tried and true Linux filesystem but doesn't have metadata
655journaling, which means that routine ext2 filesystem checks at startup time can 655journaling, which means that routine ext2 filesystem checks at startup time can
656be quite time-consuming. There is now quite a selection of newer-generation 656be quite time-consuming. There is now quite a selection of newer-generation
657journaled filesystems that can be checked for consistency very quickly and are 657journaled filesystems that can be checked for consistency very quickly and are
658thus generally preferred over their non-journaled counterparts. Journaled 658thus generally preferred over their non-journaled counterparts. Journaled
659filesystems prevent long delays when you boot your system and your filesystem 659filesystems prevent long delays when you boot your system and your filesystem
660happens to be in an inconsistent state. 660happens to be in an inconsistent state.
661</p> 661</p>
662 662
663<p> 663<p>
664<b>ext3</b> is the journaled version of the ext2 filesystem, providing metadata 664<b>ext3</b> is the journaled version of the ext2 filesystem, providing metadata
665journaling for fast recovery in addition to other enhanced journaling modes like 665journaling for fast recovery in addition to other enhanced journaling modes
666full data and ordered data journaling. ext3 is a very good and reliable 666like full data and ordered data journaling. It uses a hashed B*-tree index that
667filesystem. 667enables high performance in almost all situations. In short, ext3 is a very
668</p> 668good and reliable filesystem.
669
670<p> 669</p>
670
671<p>
671<b>ReiserFS</b> is a B*-tree based filesystem that has very good overall 672<b>ReiserFS</b> is a B*-tree based filesystem that has very good overall
672performance and greatly outperforms both ext2 and ext3 when dealing with small 673performance and greatly outperforms both ext2 and ext3 when dealing with small
673files (files less than 4k), often by a factor of 10x-15x. ReiserFS also scales 674files (files less than 4k), often by a factor of 10x-15x. ReiserFS also scales
674extremely well and has metadata journaling. As of kernel 2.4.18+, ReiserFS is 675extremely well and has metadata journaling. ReiserFS is solid and usable as
675solid and usable as both general-purpose filesystem and for extreme cases such 676both general-purpose filesystem and for extreme cases such as the creation of
676as the creation of large filesystems, the use of many small files, very large 677large filesystems, very large files and directories containing tens of
677files and directories containing tens of thousands of files. 678thousands of small files.
678</p> 679</p>
679 680
680<p> 681<p>
681<b>XFS</b> is a filesystem with metadata journaling which comes with a robust 682<b>XFS</b> is a filesystem with metadata journaling which comes with a robust
682feature-set and is optimized for scalability. We only recommend using this 683feature-set and is optimized for scalability. We only recommend using this
683filesystem on Linux systems with high-end SCSI and/or fibre channel storage and 684filesystem on Linux systems with high-end SCSI and/or fibre channel storage and
684an uninterruptible power supply. Because XFS aggressively caches in-transit data 685an uninterruptible power supply. Because XFS aggressively caches in-transit data
685in RAM, improperly designed programs (those that don't take proper precautions 686in RAM, improperly designed programs (those that don't take proper precautions
686when writing files to disk and there are quite a few of them) can lose a good 687when writing files to disk and there are quite a few of them) can lose a good
687deal of data if the system goes down unexpectedly. 688deal of data if the system goes down unexpectedly.
688</p> 689</p>
689 690
690<p> 691<p>
691<b>JFS</b> is IBM's high-performance journaling filesystem. It has recently 692<b>JFS</b> is IBM's high-performance journaling filesystem. It has recently
692become production-ready and there hasn't been a sufficient track record to 693become production-ready and there hasn't been a sufficient track record to

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