Hello,
we are using bacula on a virtual plattform (> 600 clients) and investiate
moderate swap usage issues / cache usage issues. It seems that during backup of
mysql datafiles (LVM Snapshot), the "cached" memory usage of the server
increases and thus bacula backup reads (only done one) are cached (...
polluting the rest of the vfs cache ?)
>From reading the source of src/findlib/bfile.c, bacula supports posix_fadvise
>for a long time now (2007), by those two code pices:
commit 4df486dd5b04cc16178efcb75eaf3dbd4be44b31
Author: Kern Sibbald <k...@sibbald.com>
Date: Thu May 24 19:58:07 2007 +0000
kes Add code to tell the OS that we no longer need a cached
file that we were reading. In findlib/bfile.c. Also,
only cache files that we are reading.
kes Tweak to bsmtp to eliminate compiler warnings on Win32.
kes Implement script to automatically generate cats and dll .def
files for Win32 dll.
kes Update README.mingw32 to include new .def file generation.
git-svn-id: https://bacula.svn.sourceforge.net/svnroot/bacula/trunk@4898
91ce42f0-d328-0410-95d8-f526ca767f89
bopen()
#if defined(HAVE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED)
if (bfd->fid != -1 && flags & O_RDONLY) {
int stat = posix_fadvise(bfd->fid, 0, 0, POSIX_FADV_WILLNEED);
Dmsg2(400, "Did posix_fadvise on %s stat=%d\n", fname, stat);
}
#endif
bclose()
#if defined(HAVE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
if (bfd->m_flags & O_RDONLY) {
fdatasync(bfd->fid); /* sync the file */
/* Tell OS we don't need it any more */
posix_fadvise(bfd->fid, 0, 0, POSIX_FADV_DONTNEED);
}
#endif
I checked that our bacula client was compiled with HAVE_POSIX_FADVISE (added
debug messages).
I also added more debugging code and it seems that during a normal backup run,
the code is never executed on bacula-fd as O_RDONLY is not set in the flags of
the originating bopen request.
Is this a bug or a feature ?
How can I prevent cache usage of bacula-fd on the client side at all ? Is there
a Flag in bacula-fd to force O_READONLY opening of backed up files ?
Regards,
Robert
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