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doc/cephfs: add advice about kernel versions

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Signed-off-by: John Spray <john.spray@redhat.com>
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John Spray 2016-06-20 12:28:45 +01:00
parent 7554ef048d
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doc/cephfs/early-adopters.rst
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@ -41,6 +41,27 @@ When encountering bugs or performance issues, it is often instructive to
try using the other client, in order to find out whether the bug was
client-specific or not (and then to let the developers know).
Which kernel version?
---------------------
Because the kernel client is distributed as part of the linux kernel (not
as part of packaged ceph releases),
you will need to consider which kernel version to use on your client nodes.
Older kernels are known to include buggy ceph clients, and may not support
features that more recent Ceph clusters support.
Remember that the "latest" kernel in a stable linux distribution is likely
to be years behind the latest upstream linux kernel where Ceph development
takes place (including bug fixes).
As a rough guide, as of Ceph 10.x (Jewel), you should be using a least a
4.x kernel. If you absolutely have to use an older kernel, you should use
the fuse client instead of the kernel client.
This advice does not apply if you are using a linux distribution that
includes CephFS support, as in this case the distributor will be responsible
for backporting fixes to their stable kernel: check with your vendor.
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