-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 В Mon, 3 Aug 2015 16:48:24 +0200 "Carlos E. R." <robin.listas@telefonica.net> пишет:
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On 2015-08-03 16:44, Anton Aylward wrote:
On 08/03/2015 10:36 AM, Carlos E. R. wrote:
Can't that do snapshots like BtrFS, like ext4? No, or not currently. Actually, XFS shares some devs and features with btrfs.
I recall reading that XFS could do snapshots but required (a) not to mount via uuid and (b) a "freeze" option. I also recall that the freeze option became kernel sported and could even be used with ext3, but I don't recall where I read that.
The name is the same, but the feature is distinctly different.
The purpose is to create a backup of the filesystem into a different device. It is not a COW (copy on write).
Actually it is exactly what CoW is. It is btrfs which is not CoW - more appropriate name is "redirect on write" or "write anywhere" (which is how oldest implementation is called). There is no "copy" involved in btrfs write process. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlW/lVEACgkQR6LMutpd94xybQCgr5FzuGHPh90lZ+bUjesNOa+6 QiIAoLP7RcERcHe3wG6ExSAYLxmtSlIC =T620 -----END PGP SIGNATURE-----