Using the tune2fs utility for file-system tuning in .NET

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Using the tune2fs utility for file-system tuning
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You can use the tune2fs utility to tune various aspects of a ext2 file system However, you should never apply the ext2 utilities on a mounted ext2 and always back up your data whenever you are modifying anything belonging to a file system In this section, I discuss how to use the tune2fs utility (which is part of the e2fsprogs package) to tune an unmounted ext2 file system called /dev/hda7 If you use one or more of the settings discussed below, don t forget to change the partition name (/dev/hda7) to the appropriate name First, run the following command to determine what tune2fs shows as the current settings for the unmounted /dev/hda7:
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/sbin/tune2fs -l /dev/hda7
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The output should be something similar to the following:
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tune2fs 119, 13-Jul-2000 Filesystem volume name: Last mounted on: Filesystem UUID: Filesystem magic number: Filesystem revision #: Filesystem features: Filesystem state: Errors behavior: Filesystem OS type: Inode count: Block count: Reserved block count: Free blocks: Free inodes: First block: Block size: Fragment size: for EXT2 FS 05b, 95/08/09 <none> <not available> 5d06c65b-dd11-4df4-9230-a10f2da783f8 0xEF53 1 (dynamic) filetype sparse_super clean Continue Linux 1684480 13470471 673523 13225778 1674469 1 1024 1024
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Blocks per group: Fragments per group: Inodes per group: Inode blocks per group: Last mount time: Last write time: Mount count: Maximum mount count: Last checked: Check interval: Next check after: Reserved blocks uid: Reserved blocks gid: First inode: Inode size:
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8192 8192 1024 128 Thu Feb 15 17:51:19 Thu Feb 15 17:51:51 1 20 Thu Feb 15 17:50:23 15552000 (6 months) Tue Aug 14 18:50:23 0 (user root) 0 (group root) 11 128
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The settings discussed in the following list are bolded above The is Errors behavior setting dictates how the kernel behaves when errors are detected on the file system There are three possible values for this setting: continue, remount-ro (read only), and panic The default setting is to continue even if there is an error The Mount count setting is the number of time you have mounted this file system The Maximum mount count setting means that after the maximum number of read/write mode mounts (in this case, 20) the file system is subject to an fsck checking session during the next boot cycle The Last checked setting shows the last date at which an fsck check was performed The Check interval setting shows the time difference for two consecutive fsck sessions The check interval is only used if the maximum read/write mount count is not reached during the interval In other words, if you don t unmount the file system for 6 months, then even though the mount count will be only 2, the fsck check will be forced because the file system exceeded the check interval The next fsck check date is shown in Next check after setting The Reserved blocks uid and Reserved blocks gid settings show which user and group has ownership of the reserved portion of this file system By default, the reserved portion is to be used by superuser (UID = 0, GID = 0) On an unmounted file system such as /dev/hda7, you can change the maximum read/write mount count setting to be something more suitable for your needs by using the -c option with tune2fs For example, /sbin/tune2fs -c 1 /dev/hda7 will force an fsck check on the file system every time you boot the system You can also use the -i option to change the time-based fsck check enforcement schedule
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For example, the /sbin/tune2fs --i7d /dev/hda7 command ensures that fsck checks are enforced if the file system is remounted in read/write mode after a week Similarly, the /sbin/tune2fs --i0 /dev/hda7 command disables the time-based fsck checks
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