工具与资源github.com
ntfs2btrfs：把 NTFS 文件系统原地转换为 Btrfs
Ntfs2btrfs does in-place conversion of NTFS filesystem to the open-source Btrfs
2022 — 2024，它一次次回到首页
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导读
ntfs2btrfs 是一个开源工具，可以在不复制数据的情况下将 NTFS 文件系统原地转换为 Btrfs。它出自 WinBtrfs 和 Quibble 的作者，让用户能把旧 Windows 分区直接迁移到开源文件系统。
为什么经久不衰：原地转换文件系统是少见且实用的能力，加上作者在 Windows 上实现 Btrfs 的系列项目，使其成为跨平台文件系统迁移的经典工具。
HN 评论精选
从 ext4 死忠转为 Btrfs 用户，实际使用体验良好，愿意信任发行版的默认选择
我以前属于'为什么要用 Btrfs'阵营，在 Fedora 上坚持只用 ext4。后来看到发行版持续默认提供 Btrfs，加上去重、校验和、快照等现代文件系统特性确实有吸引力，我就在新笔记本上试了。到目前为止没遇到任何问题。我已经到了没时间折腾配置的年纪，既然发行版愿意承担维护责任，我愿意信任他们。
basilgohar查看英文原文
I used to be in the "why BTRFS" camp and religiously would only install ext4 without LVM on Fedora for my laptops, desktops, and servers. When I saw so many subsequent releases persist in offering BTRFS by default, I decided to try it for a recent laptop install, because honestly, the appeal of deduplication, checksumming, snapshotting, and so many other features that modern FSes generally come with (e.g., ZFS), I just decided to jump the gun and went ahead and installed it. I can safely say it has not presented any problem with me thus far, and I am at the stage of my life where I realize that I don't have the time to fiddle as much with settings. If the distributions are willing to take that maintenance on their shoulders, I'm willing to trust them and deal with the consequences – at least I know I'm not alone.
作者亲身经历：原地转换和 btrfs 多盘阵列都踩过很多坑，建议直接复制数据到新卷
虽然这能把我的旧 NTFS 分区拖进 21 世纪，但我再也不会做原地转换了。几年前我从 ext3 转 btrfs，轻度使用几小时后就灾难性崩溃，试了几次都不行。最后我干脆把数据复制到新的 btrfs 卷。但之后又遇到一堆问题：很多想快照的东西得关掉 CoW、碎片整理实际上会解除共享的 extent、多盘阵列上 btrfs 的故障模式会让根文件系统变只读。我大概丢了三四个本应'有冗余'的文件系统才放弃。
drbawb查看英文原文
Although this would be an interesting way to drag some of my old NTFS filesystems kicking & screaming into the 21st century, I'd never do one of these in-place conversions again. I tried to go from ext3 to btrfs several years ago - and it would catastrophically fail after light usage. (W're talking less than a few hours of desktop-class usage. In retrospect I think it was `autodefrag/defragment` that would kill it.) I tried that conversion a few times and it never worked, I think I even tried to go from ext3->ext4->btrfs. This was on an Arch install so (presumably) it was the latest and greatest kernel & userspace available at the time. I eventually gave up (/ got sick of doing restores) and just copied the data into a fresh btrfs volume. That worked "great" up until I realized (a) I had to turn off CoW for a bunch of things I wanted to snapshot, (b) you can't actually defrag in practice because it unlinks shared extents and (c) btrfs on a multi-drive array has a failure mode that will leave your root filesystem readonly; which is just a footgun that shouldn't exist in a production-facing filesystem. - I should add that these were not particularly huge filesytems: the ext3 conversion fiasco was ~64G, and my servers were like ~200G and ~100G respectively. I also was doing "raid1"/"raid10" style setups, and not exercising the supposedly broken raid5/raid6 code in any way. I think I probably lost three or four filesystems which were supposed to be "redundant" before I gave up and switched to ZFS. Between (a) & (b) above btrfs just has very few advantages compared to ZFS. Really the only thing going for it was being available in mainline kernel builds. (Which, frankly, I don't consider that to be an advantage the way the GPL zealots on the LKML seem to think it is.)
质疑原地转换的必要性——如今硬盘便宜，备份重装更安全
原地转换 NTFS？你要么还信神，要么该查查现在硬盘多少钱了。认真问一句：为什么会有人做分区的原地转换？
Flocular查看英文原文
In-place conversion of NTFS? You either still believe in a god or need to google the price of harddrives these days. Honest question tho, why would anybody do in-place conversion of partitions?
指出作者是 WinBtrfs/Quibble 的同一人，整套工具理论上能让 Windows 原生跑在 Btrfs 上
这出自 WinBtrfs 和 Quibble 的作者——前者是 Windows NT 的 Btrfs 可安装文件系统，后者是引导程序。有了这一整套，理论上可以在 Btrfs 上原生启动和运行 Windows。
boricj查看英文原文
From the same person that made WinBtrfs and Quibble, a Windows NT Btrfs installable filesystem and bootloader. And yes, with all of that one can boot and run Windows natively on Btrfs, at least in theory.
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