[lustre-discuss] Lustre and server upgrade

[Colin Faber]

Hi,

I believe in 2.10 sometime (someone correct me if I'm wrong) that the index
parameter was required and needs to be specified. On an existing system
this should already be set, but can you check the parameters line with
tunefs.lustre for correct index=N values across your storage nodes?

Also, with your "upgrade", was this a fresh install utilizing legacy
targets?

The last thing I can think of IIRC, there was on-disk format changes
between 2.5 and 2.12, these should be transparent to you, but it may be
some other issue is preventing successful upgrade, though the missing
module error really speaks to possible issues around how lustre was
installed and loaded on the system.

Cheers!

-cf


On Thu, Nov 18, 2021 at 12:24 PM STEPHENS, DEAN - US via lustre-discuss <
lustre-discuss at lists.lustre.org> wrote:

> I am by no means a Lustre expert and am seeking some help with our system.
> I am not able to get log file to post as the servers are in the closed area
> with no access to the Internet.
>
>
>
> Here is a bit of history of our system:
>
> The OSS and MDS nodes were RHEL6 and running a Luster server the kernel
> 2.6.32-431.23.3.el6_lustre.x86_64 and the Lustre version of 2.5.3. the
> client version was 2.10. That was in a working state.
>
> We upgraded the OSS ad MDS nodes to RHEL7 and installed Lustre server 2.12
> software and kernel.
>
> The attached 11 LUNs are showing up as /dev/sdb - /dev/sdl
>
> Right now, on the OSS nodes, if I use the command tunefs.luster /dev/sdb I
> get some data back saying that Lustre data has been found but at the bottom
> of the out put it shows “tunefs.lustre: Unable to mount /dev/sdb: No such
> device” and “Is the ldiskfs module available”
>
> When I do a “modprobe -v lustre” I do not see ldiskfs.ko as being loaded
> even though there is a ldiskfs.ko file in
> /lib/modules/3.10.0-1160.2.1.el7_lustre.x86_64/extra/lustre/fs directory. I
> am not sure how to get it to load in the modprobe command.
>
> I used “insmod
> /lib/modules/3.10.0-1160.2.1.el7_lustre.x86_64/extra/lustre/fs/ ldiskfs.ko”
> and re-ran the “tunefs.luster /dev/sdb” command with the same result.
>
> If I use the same command on the MDS nodes I get “no Lustre data found and
> /dev/sdb has not been formatted with mkfs.lustre”. I am not sure that is
> what is needed here as the MDS nodes do not really have the lustre data as
> it is the meta data server.
>
> I tried to use the command “tunefs.lustre --mgs --erase_params
> --mgsnode=<IP address>@tcp --writeconf --dryrun /dev/sdb” and get the error
> “/dev/sdb has not been formatted with mkfs.lustre”.
>
>
>
> I need some help and guidance and I can provide what may be needed though
> it will need to be typed out as I am not able to get actual log files from
> the system.
>
>
>
> Dean Stephens
>
> CACI
>
> Linux System Admin
>
>
>
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