On Sat, 21.03.15 12:56, Goffredo Baroncelli (kreij...@libero.it) wrote:
From: Goffredo Baroncelli kreij...@inwind.it
Add +C attrib to the journal files directories. The journal file format
behaves bad on a BTRFS filesystem: the performances decrease during the
time.
To avoid this issue, this tmpfile.d snippet sets the NOCOW attribute to the
journal files directories, so newly created journal files inherit the NCOOW
attribute.
I think it would be good if much of this explanation would actually be
in the tmpfiles snippet.
Be aware that the NOCOW attribute disables the BTRFS checksums, prevent BTRFS
to rebuild a corrupted file in a RAIDx filesystem. However the perfomances
increase.
In a single disk filesystem (or a filesystem without redundancy) it is safe
to use the NOCOW flags.
---
tmpfiles.d/journal-nocow.conf | 19 +++
1 file changed, 19 insertions(+)
create mode 100644 tmpfiles.d/journal-nocow.conf
diff --git a/tmpfiles.d/journal-nocow.conf b/tmpfiles.d/journal-nocow.conf
new file mode 100644
index 000..8d9c1e8
--- /dev/null
+++ b/tmpfiles.d/journal-nocow.conf
@@ -0,0 +1,19 @@
+# This file is part of systemd.
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+# See tmpfiles.d(5) for details
+
+# set the journal file as NOCOW; make sense only for BTRFS
filesystem
This will not set the journal file as NOCOW, but will set the flag
for the directory as a whole. Please explain this more accurately.
+# WARNING: the NOCOW attribute disables the BTRFS checksums, prevent BTRFS
+# to rebuild a corrupted file in a RAIDx filesystem. It is suggested
+# to disables these setting in this kind of filesystem.
+# However in a single disk filesystem (or a filesystem without
+# redundancy) it is safe to use the NOCOW flag.
+# Setting the NOCOW flag the perfomances increase.
This is not correct english.
+
+h /var/log/journal/%m - - - - +C
+h /var/log/journal/remote - - - - +C
I think /var/log/journal itself should also get this treatment.
Lennart
--
Lennart Poettering, Red Hat
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