[ceph-users] Luminous/Ubuntu 16.04 kernel recommendation ?

[Yoann Moulin]

Hello,

What is the best kernel for Luminous on Ubuntu 16.04 ?

Is linux-image-virtual-lts-xenial still the best one ? Or linux-virtual-hwe-16.04 will offer some improvement ?

Thanks,

[Kevin Olbrich]

Would be interested as well.

- Kevin

Post by Yoann Moulin
Hello,
What is the best kernel for Luminous on Ubuntu 16.04 ?
Is linux-image-virtual-lts-xenial still the best one ? Or
linux-virtual-hwe-16.04 will offer some improvement ?
Thanks,
--
Yoann Moulin
EPFL IC-IT
_______________________________________________
ceph-users mailing list
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

[Martin Emrich]

I have a machine here mounting a Ceph RBD from luminous 12.2.2 locally,
running linux-generic-hwe-16.04 (4.13.0-32-generic).

Works fine, except that it does not support the latest features: I had
to disable exclusive-lock,fast-diff,object-map,deep-flatten on the
image. Otherwise it runs well.

Regards,

Martin

Post by Kevin Olbrich
Would be interested as well.
- Kevin
Hello,
What is the best kernel for Luminous on Ubuntu 16.04 ?
Is linux-image-virtual-lts-xenial still the best one ? Or
linux-virtual-hwe-16.04 will offer some improvement ?
Thanks,
--
Yoann Moulin
EPFL IC-IT
_______________________________________________
ceph-users mailing list
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
<http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com>
_______________________________________________
ceph-users mailing list
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

[Ilya Dryomov]

On Thu, Feb 8, 2018 at 11:20 AM, Martin Emrich

Post by Martin Emrich
I have a machine here mounting a Ceph RBD from luminous 12.2.2 locally,
running linux-generic-hwe-16.04 (4.13.0-32-generic).
Works fine, except that it does not support the latest features: I had to
disable exclusive-lock,fast-diff,object-map,deep-flatten on the image.
Otherwise it runs well.

That kernel should support exclusive-lock. It doesn't hurt to disable
exclusive-lock if you don't need it though.

Thanks,

Ilya

[Martin Emrich]

Post by Ilya Dryomov
On Thu, Feb 8, 2018 at 11:20 AM, Martin Emrich

Post by Martin Emrich
I have a machine here mounting a Ceph RBD from luminous 12.2.2 locally,
running linux-generic-hwe-16.04 (4.13.0-32-generic).
Works fine, except that it does not support the latest features: I had to
disable exclusive-lock,fast-diff,object-map,deep-flatten on the image.
Otherwise it runs well.

That kernel should support exclusive-lock. It doesn't hurt to disable
exclusive-lock if you don't need it though.

Thanks, good to know... But indeed I do not need it in this case.

Cheers,

Martin

[Kevin Olbrich]

Post by Martin Emrich
I have a machine here mounting a Ceph RBD from luminous 12.2.2 locally,
running linux-generic-hwe-16.04 (4.13.0-32-generic).
Works fine, except that it does not support the latest features: I had to
disable exclusive-lock,fast-diff,object-map,deep-flatten on the image.
Otherwise it runs well.

I always thought that the latest features are built into newer kernels, are
they available on non-HWE 4.4, HWE 4.8 or HWE 4.10?
Also I am researching for the OSD server side.

- Kevin

[Ilya Dryomov]

Post by Kevin Olbrich

Post by Martin Emrich
I have a machine here mounting a Ceph RBD from luminous 12.2.2 locally,
running linux-generic-hwe-16.04 (4.13.0-32-generic).
Works fine, except that it does not support the latest features: I had to
disable exclusive-lock,fast-diff,object-map,deep-flatten on the image.
Otherwise it runs well.

I always thought that the latest features are built into newer kernels, are
they available on non-HWE 4.4, HWE 4.8 or HWE 4.10?

No, some of these features haven't made it to the kernel client yet.

Post by Kevin Olbrich
Also I am researching for the OSD server side.

For the OSDs, you should be fine with pretty much any kernel supported
by your distro.

Thanks,

Ilya

[Steffen Weißgerber]

Hello,

Post by Kevin Olbrich

Post by Martin Emrich
I have a machine here mounting a Ceph RBD from luminous 12.2.2 locally,
running linux-generic-hwe-16.04 (4.13.0-32-generic).
Works fine, except that it does not support the latest features: I had to
disable exclusive-lock,fast-diff,object-map,deep-flatten on the image.
Otherwise it runs well.

I always thought that the latest features are built into newer kernels, are
they available on non-HWE 4.4, HWE 4.8 or HWE 4.10?
Also I am researching for the OSD server side.

You'll find it in the kernel sources with

grep RBD_FEATURE /usr/src/linux/drivers/block/rbd.c

Post by Kevin Olbrich
- Kevin

Regards

Steffen