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My understanding is that COW filesystems have really bad fragmentation if you're changing portions of large files -- for example, with virtual machine disk imag
by wch 14y ago
My understanding is that COW filesystems have really bad fragmentation if you're changing portions of large files -- for example, with virtual machine disk images.
- wch 14y agoActually, I just discovered that on btrfs, you can disable COW on a volume, or even on individual files. To do it on a per-file basis, you have to compile a small program available here: http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg14877.html http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg1... This makes btrfs suitable for virtual machine images.