Creating an EXT3 filesystem in .NET

Development ANSI/AIM Code 128 in .NET Creating an EXT3 filesystem
Creating an EXT3 filesystem
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As mentioned at the end of the Creating Filesystems section, the same utility is used under the covers to create both EXT2 and EXT3 filesystems; it is simply invoked differently by the mkfs wrapper command. Therefore, the same options are available when creating an EXT3 filesystem. The easiest way to create an EXT3 filesystem is to use the mkfs wrapper command, specifying ext3 as the type of filesystem that you want to create. Listing 3-7 shows the output of the mkfs command when creating an EXT3 filesystem with default settings. Note that the output
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3 Partitions, Filesystems, and Files
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of this command is exactly the same as that shown when creating an EXT2 filesystem in the previous section, with the exception of the following line:
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Creating journal (8192 blocks): done
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This line indicates that a journal was created for the new partition, and that it is therefore an EXT3 partition.
Listing 3-7: Creating an EXT3 Filesystem
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bible:~ # mkfs t ext3 /dev/hda5 mke2fs 1.34 (25-Jul-2003) Filesystem label= OS type: Linux Block size=1024 (log=0) Fragment size=1024 (log=0) 49152 inodes, 196024 blocks 9801 blocks (5.00%) reserved for the super user First data block=1 24 block groups 8192 blocks per group, 8192 fragments per group 2048 inodes per group Superblock backups stored on blocks: 8193, 24577, 40961, 57345, 73729 Writing inode tables: done Creating journal (8192 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 36 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. bible:~ #
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When creating an EXT2 or EXT3 filesystem manually, you should write down the location of the superblock backups that were created as part of the filesystem. A good place to write these is on a label that you then attach to the top of the disk. You may need to know this information if the primary superblock on your filesystem ever becomes corrupted. For information about how and when to use these superblock backups, see the section Common EXT2 and EXT3 mount options later in this chapter.
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Upgrading an EXT2 filesystem to an EXT3 filesystem
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Because EXT2 and EXT3 filesystems share the same internal structure (with the exception of whether or not a journal exists), you can easily convert an existing EXT2 filesystem to an EXT3 filesystem to take advantage of the journaling capabilities of the latter. You may want to do this if you decided to play things safe and created all of your filesystems as EXT2 filesystems when you installed SUSE on your system, or if you are upgrading an older, existing Linux system that uses EXT2 filesystems to the latest revision of SUSE Linux. Either way, converting
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an existing EXT2 filesystem to EXT3 is a painless operation involving two steps: using the tune2fs command to add an EXT3 journal to each existing EXT2 filesystem that you want to upgrade and then updating your system s filesystem table (/etc/fstab) to identify the upgraded partition(s) as EXT3 filesystems rather than EXT2 filesystems. The structure of the /etc/fstab file is explained in detail later in this chapter in the section Automatically mounting filesystems. Upgrading an EXT2 filesystem to an EXT3 filesystem is a completely safe operation to perform on any existing EXT2 filesystem. The EXT3 filesystem was designed with this sort of upgrade in mind and is a truly impressive piece of work.
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Caution As mentioned earlier, you should not upgrade EXT2 filesystems to EXT3 filesystems in certain circumstances, specifically if your EXT2 filesystem holds data files such as Oracle database files that have their own built-in journaling mechanism. Running two journaling mechanisms on the same file may cause data corruption or may cause your database system to crash.
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Listing 3-8 shows the output from using the tune2fs command to upgrade an existing EXT2 filesystem to an EXT3 filesystem. When this command completes, simply bring up the file /etc/fstab in your favorite text editor, search for the line related to each partition that you upgraded, and change the value ext2 to ext3. After saving the file, you can reboot your system to take advantage of the journaling capabilities of your new EXT3 filesystems.
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