On Sat, Mar 21, 2015 at 12:56:51PM +0100, Goffredo Baroncelli wrote: > > Hi all, > > these patches set reverts the commit 11689d2 "journald: turn off COW for > journal files on btrfs" which enables *unconditionally* the NOCOW flag for the > journal files. The reason was that the performances of the journal file format > are very bad on btrfs, and decrease during the time. Disabling the COW > behavior, the perfomances increase. > Unfortunately disabling the COW behavior leads to disable the BTRFS checksums, > which in turn prevents BTRFS to rebuild a corrupted file in a RAID > filesystem [3]. > > To avoid that I proposed a patch which introduces a configurable option to > disables the "turn off COW" behavior[1]. Lennart commented that instead he > prefer to set the NOCOW attribute via tmpfile.d snippets. > > A further patches set was proposed and accepted [2] to extend systemd-tmpfiles > to change the file attributes. > > This last patches set removes the "turn off COW" behavior (patch #1) and > introduces a new tmpfiles.d snippet which enable the NOCOW beahvior for the > journal files (patch #2). So a sysadmin can disable this setting overriding > this file configuration. Let's see what Lennart says. He's travelling currently so this will have to wait a while.
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