Am 30.06.2022 um 21:07 schrieb Chris Woelkers - NOAA Federal:
Although I realize that this question is more about NFS than Apache it
still concerns my web server so here goes. This is at work so a bit of
history first, sorry for the novel length email in advance.
The set up I have was already in existence when I started my current
position. The web server, running Apache on top of Debian 8, was
directly connected to a storage server, also on Debian 8, via a
dedicated 10Gbps network link. The storage was accessed via NFS mounts,
different mounts for different areas in order to section them off within
the website with aliases. Not all of the website was stored on the
server, just the ones that used the most disk space.
Of course this was three years ago and Debian 8 went EOL. Before that
occurred it was my job to upgrade the servers to a later version of
Debian. In order to keep the distribution upgrades as far apart as
possible I went with Debian 11, upgrading on a path from 9 to 10 to 11.
During the upgrade all services were checked out for basic functionality
and no problems were seen.
Not long after the upgrade an interesting problem was apparent. Files
accessed over NFS were not downloading properly. The download would
start but then stop anywhere from 30% to 60%. These files were not large
with the smallest ones being just over 1MB. Any file stored on the web
server itself downloaded just fine, no matter the size. I checked just
about everything on that connection from the cable, which was only 1
foot in length so I got a longer one, to the NFS mount options. Changes
were made but they did not seem to make a difference and all file
transfer tests done within the OS itself worked fine with files up to
100MB tested.
The only thing I did not check until recently was the NFS version. The
mounts were automatically using NFSv4 which I considered, at this point
in its development, to be stable. However when I switched to NFSv3 the
problem went away. So after all that I seemed to have "solved" it by
dropping back to an older version of NFS.
So the questions I have for the community are: Has anyone seen a similar
issue and solved it? If so did you find another solution other than
reverting to NFSv3?
Try disabling sendfile and mmap:
https://httpd.apache.org/docs/2.4/en/mod/core.html#enablesendfile
https://httpd.apache.org/docs/2.4/en/mod/core.html#enablemmap
If that helps, check out, which of the two is the culprit.
Best regards,
Rainer
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