[lustre-discuss] 1.8 client on 3.13.0 kernel

[Patrick Farrell]

Lewis,

My own understanding is you are out of luck - the 1.8 client cannot realistically be brought forward to newer kernels.  Far too many changes over too long a period.

As far as version compatibility, I believe no newer clients will talk to servers running 1.8.  If any will, they would be very early 2.x versions, which won't support your desired kernel versions anyway.

Regards,
Patrick

________________________________________
From: lustre-discuss [lustre-discuss-bounces at lists.lustre.org] on behalf of Lewis Hyatt [lhyatt at gmail.com]
Sent: Tuesday, September 08, 2015 9:06 AM
To: lustre-discuss at lists.lustre.org
Subject: [lustre-discuss] 1.8 client on 3.13.0 kernel

Hello-

We have a working 1.8 lustre cluster with which we are very happy. The object
and metadata servers are running one of the recommended CentOS distributions
(5.4), but the clients are all Ubuntu 10.04 LTS, with kernel 2.6.32. It is not
feasible for us to change on the client side to a different distro other than
Ubuntu, but we are about to go to Ubuntu 14, with kernel 3.13.0, for reasons
unrelated to lustre. Unfortunately it seems that lustre 1.8 cannot be built on
this kernel, we can't even get through the configure process without a large
number of errors. The first one we hit is this:

checking for /lib/modules/3.13.0-63-generic/build/include/linux/autoconf.h... no

But various attempts to hack around the errors as they come up have not led to
much success. Is this something we can hope to achieve? I thought I saw some
threads about a series of patches to support this kernel in lustre 1.8 but I
haven't been able to find anything conclusive. We are really hoping it is
possible to upgrade our clients without touching the lustre servers, as we
don't want to disturb that production system which has been very reliable for
us, and we don't have much in-house expertise with lustre or CentOS. We were
able to build a newer lustre client on the 3.13 kernel, but it seems it is not
willing to interact with the 1.8 servers.

Thanks for any advice, much appreciated.

-Lewis
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