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ext4

网络第四扩展文件系统

ext4

ext4

ext4

第四扩展文件系统

在 Linux 客户机操作系统中，分区格式化为第四扩展文件系统 (ext4) 时不显示分区信息格式化为 ext4 的分区可能不会在 [VMwa…

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One of the first visible differences in ext4 is the increased support for file system volumes, file sizes, and subdirectory limits.

ext4 的一个明显差别就是它支持更大的文件系统、文件和子目录。

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Delayed allocation Ext4 can delay allocating disk space until the last moment, which can improve performance .

延迟分配 Ext4 能够尽量延迟磁盘空间的分配，这能够提高性能。

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Ext4 implements this through a new system call that preallocates and initializes a file of a given size .

ext4 通过一个新的系统调用来实现这个目的，这个调用将按照特定的大小预分配并初始化文件。

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Extents in ext4 adopt a layered approach to efficiently represent small files as well as extent trees to efficiently represent large files .

ext4 的区段采用分层的方法高效地表示小文件，并且使用区段树高效地表示大文件。

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The time range has also be extended with two additional bits to increase the lifetime by another 500 years .

ext4 给时间范围添加了两个位，从而让时间寿命再延长 500 年。

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For this reason , ext4 was designed to be both forward and backward (to an extent) compatible (see Figure 1 ).

为此，ext4 被设计为在 extent 方面具有向后和向前兼容性（参见图 1 ）。

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Ext4 marks unused groups of blocks within the inode table to allow the fsck process to skip them entirely to speed the check process .

ext4 将未使用的块组标记到 inode 表中，并让 fsck 进程忽略它们以加快检查速度。

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But even as ext4 addresses scalability and reliability , it provides a number of enhancements for improved performance .

但是，ext4 不仅解决了伸缩性和可靠性，它还提供各种改善性能的方法。

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Ext4 has spent a great deal of time addressing possible scenarios with journal corruption that can lead to data corruption .

Ext4 文件系统就花费了大量的时间来对付可能导致数据丢失的各种日志损坏问题。

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As file systems scale to the massive sizes possible with ext4, greater reliability concerns will certainly follow.

ext4 文件系统可能会扩展得比较大，这将导致可靠性问题。

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Ext4 adds support for online defragmentation , which should improve overall performance .

Ext4 支持在线磁盘整理，这能够改善总体性能。

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Ext4 is so scalable that the maximum file system would consume one million 1-terabyte (TB ) disks.

ext4 的伸缩性如此之大，以致最大的文件系统所用的磁盘空间将达到 100万 TB 。

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Ext4 supports file systems of up to 1 exabyte in size (1000 petabytes).

ext4 支持的最大文件系统为 1EB （1000PB ）。

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Amazingly, timestamps in the extended file system arena prior to ext4 were seconds based.

令人惊讶的是，ext4 之前的扩展文件系统的时间戳都是以秒为单位的。

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Finally , the subdirectory limit was extended with ext4, from 32KB directories deep to virtually unlimited .

最后，ext4 也扩展了子目录的容量，将其从 32KB 扩展到无穷大。

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So if you restore a backup created when you were on EXT4, it will restore as EXT4.

所以如果你创建一个备份恢复，当你上 EXT4 ，它就会恢复为 ext4 。

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Ext4 permits exabyte file systems that can support larger numbers of files , larger files, and deeper directory structures .

Ext4 允许使用 exabyte 文件系统，这种系统支持的文件数量更多、体积更大、目录结构更深。

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The fourth extended file system (ext4) file system was renamed from ext4dev to ext4, which means that it 's stable enough for regular use .

第4 扩展文件系统（Thefourthextendedfilesystem ）的名字 ext4 是由 ext4dev 改变而来的，这意味着它已经足够稳定，可以常规使用。

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Ext4 is forward compatible in that you can mount an ext3 file system as an ext4 file system .

ext4 与 ext3 是向前兼容的，这样就可以将 ext3 文件系统挂载为 ext4 文件系统。

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Btfs has been scrapped leaving Ext4 as the default filesystem , Upstart has seen some tweaks , and i686 is the lowest CPU denominator.

Btfs 已经取消作为默认文件系统，留下了 Ext4，Upstart 出现了一些微调，i686 则损耗最低的 CPU 。

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Fast-forward to today . We now have the fourth extended file system (ext4).

今天，我们已经拥有第4 个扩展文件系统（ext4 ）。

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For this reason , the minimum timestamp resolution in ext4 is 1 nanosecond .

因此，ext4 中时间戳的最小分辨率为 1 纳秒。

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Ext4 was implemented by a team of developers , led by Theodore Tso (the ext3 maintainer ), and was introduced in the 2. 6. 19 kernel.

ext4 是由 TheodoreTso （ext3 的维护者）领导的开发团队实现的，并引入到 2.6.19 内核中。

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You can also gradually migrate a file system from ext3 to ext4 online with a mass change .

通过大规模的改变可以逐渐将文件系统从 ext3 迁移到 ext4 。

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Most notably , ext4 supports file systems of 1 exabyte in size .

最值得一提的是，ext4 支持 1EB 的文件系统。

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