ext3到ext4的问题

[prisoner]

准备升级到9.04，请问下ext3会自动转换到ext4么？

[想入非非]

好像能够转换。。。但是不能转换回来

[vmmm]

重装比较好，先做好备份

[yilan198711]

我是重新刻盘

安装的…………

保险

[prisoner]

如果是要重装的话 我还是不升级好了。

[fudaming]

想知道怎么转换，正好做个小白，实验一下。

这两天看着不顺眼，打算重装了。

[luwen]

不会自动转换 引导区分区暂时不推荐转化的（如果转换，必须采用beta版的grub，不然不支持ext4）

[Alpha.Roc]

3.2. Migrate existing Ext3 filesystems to Ext4

You need to use the tune2fs and fsck tools in the filesystem, and that filesystem needs to be unmounted. Run:

tune2fs -O extents,uninit_bg,dir_index /dev/yourfilesystem

After running this command you MUST run fsck. If you don't do it, Ext4 WILL NOT MOUNT your filesystem. This fsck run is needed to return the filesystem to a consistent state. It WILL tell you that it finds checksum errors in the group descriptors - it's expected, and it's exactly what it needs to be rebuilt to be able to mount it as Ext4, so don't get surprised by them. Since each time it finds one of those errors it asks you what to do, always say YES. If you don't want to be asked, add the "-p" parameter to the fsck command, it means "automatic repair":

fsck -pf /dev/yourfilesystem

首先保证 unmount 你要转换的盘（最好进入recover mode 来 unmount），然后使用 tune2fs 转换分区。。

tune2fs -O extents,uninit_bg,dir_index /dev/yourfilesystem

转换完成后，再使用 fsck 检查磁盘，这步是必须的

fsck -pf /dev/yourfilesystem

fsck 检查时候会返回一些校验码错误——对此无须担心，只需选择 YES 进行修复。。上个命令使用 -p 开关开启了自动修复。。

[fudaming]

我的根整个就是一个分区，怎么转换根呢？usb启动？