On Tue, Jul 30, 2019 at 10:33 AM Massimo Sgaravatto
<massimo.sgaravatto@xxxxxxxxx> wrote:
>
> The documentation that I have seen says that the minimum requirements for clients to use upmap are:
>
> - CentOs 7.5 or kernel 4.5
> - Luminous version
Do you have a link for that?
This is wrong: CentOS 7.5 (i.e. RHEL 7.5 kernel) is right, but for
upstream kernels it is 4.13 (unless someone did a large backport that
I'm not aware of).
>
> But in general ceph admins could not have access to all clients to check these versions.
>
> In general: is there a table somewhere reporting the minimum "feature" version supported by upmap ?
>
> E.g. right now I am interested about 0x1ffddff8eea4fffb. Is this also good enough for upmap ?
Yeah, this is annoying. The missing feature bit has been merged into
5.3, so starting with 5.3 the kernel client will finally report itself
as luminous.
In the meantime, use this:
$ cat /tmp/detect_upmap.py
if int(input()) & (1 << 21):
print("Upmap is supported")
else:
print("Upmap is NOT supported")
$ echo 0x1ffddff8eea4fffb | python /tmp/detect_upmap.py
Upmap is supported
Thanks,
Ilya
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