[lustre-discuss] Lustre and server upgrade

[STEPHENS, DEAN - US]

One more thing that I have noticed using the llmount.sh script, the directories that were created by the script under /mnt have 000 set for the permissions. The ones that I have configure under /mnt/lustre are set to 750 permissions.

Is this something that needs to be fixed. I have these server being configure via puppet and that is how the /mnt/lustre directories are being created and the permissions set.

Dean


From: STEPHENS, DEAN - US
Sent: Friday, November 19, 2021 7:14 AM
To: Colin Faber <cfaber at gmail.com>
Cc: lustre-discuss at lists.lustre.org
Subject: RE: [lustre-discuss] Lustre and server upgrade

The other question that I have is how to clean up after the llmount.sh has been run? If I do a df on the server I see that mds1, osd1, and ost2 are still mounted to /mnt. Do I need to manually umount them since the llmount.sh completed successfully?

Also I have not done anything to my MDS node so some direction on what to do there will be helpful as well.

Dean

From: STEPHENS, DEAN - US
Sent: Friday, November 19, 2021 7:00 AM
To: Colin Faber <cfaber at gmail.com<mailto:cfaber at gmail.com>>
Cc: lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>
Subject: RE: [lustre-discuss] Lustre and server upgrade

Thanks for the help yesterday and I was able to install the Lustre kernel and software on a VM to include the test RPM.

This is what I did following these directions<https://wiki.lustre.org/Installing_the_Lustre_Software#Lustre_Servers_with_LDISKFS_OSD_Support>:
Installed the Lustre kernel and kernel-devel (the other RPMs listed were not in my luster-server repo)
Rebooted the VM
Installed kmod-lustre kmod-lustre-osd-ldiskfs lustre-osd-ldiskfs-mount lustre lustre-resource-agents lustre-tests
Ran modprobe -v lustre (did not show that it loaded kernel modules as it has done in the past)
Ran lustre_rmmod (got an error Module Luster in use)
Rebooted again
Ran llmount.sh and it looked like it completed successfully
Ran tunefs.lustre /dev/sdb (at the bottom of the output I am seeing tunefs.luster: Unable to mount /dev/sdb: Invalid argument and tunefs.luster: FATAL: failed to write local files and tunefs.luster: exiting with 22 (Invalid argument))

Any idea what the “invalid argument” is talking about?

Dean

From: Colin Faber <cfaber at gmail.com<mailto:cfaber at gmail.com>>
Sent: Thursday, November 18, 2021 3:34 PM
To: STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>>
Cc: lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>
Subject: Re: [lustre-discuss] Lustre and server upgrade

The VM will need a full install of all server packages, as well as the tests package to allow for this test.

On Thu, Nov 18, 2021 at 2:26 PM STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>> wrote:
I have not tried that but I can do that on a new VM that I can create. I assume that is all that I need is the lustre-tests RPM and associated dependencies and not the full blown lustre install?

Dean

From: Colin Faber <cfaber at gmail.com<mailto:cfaber at gmail.com>>
Sent: Thursday, November 18, 2021 2:22 PM
To: STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>>
Cc: lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>
Subject: Re: [lustre-discuss] Lustre and server upgrade

So that indicates that your installation is incomplete or something else is preventing lustre, ldiskfs, and possibly other modules from loading.  Have you been able to reproduce this behavior on a fresh rhel install with lustre 2.12.7? (i.e. llmount.sh failing)?

-cf


On Thu, Nov 18, 2021 at 2:20 PM STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>> wrote:
Thanks for the direction. I found it and installed lustre-tests.x86_64 and now I have the llmount but it was defaulted to /usr/lib64/lustre/tests/llmount.sh and when I ran it but it failed with:

Stopping clients: <hostname> /mnt/lustre (opts: -f)
Stopping clients: <hostname> /mnt/lustre2 (opts: -f)
Loading modules from /usr/lib64/lustre/tests/..
Detected 2 online CPUs by sysfs
Force libcfs to create 2 CPU partitions
Formatting mgs, mds, osts
Format mds1: /tmp/lustre-mdt1
Mkfs.lustre: Unable to mount /dev/loop0: No such device (even though /dev/loop0 is a thing)
Is the ldiskfs module loaded?

Mkfs.lustre FATAL: failed to write local files
Mkfs.lustre: exiting with 19 (no such device)

From: Colin Faber <cfaber at gmail.com<mailto:cfaber at gmail.com>>
Sent: Thursday, November 18, 2021 2:03 PM
To: STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>>
Cc: lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>
Subject: Re: [lustre-discuss] Lustre and server upgrade

This would be part of the lustre-tests RPM package and will install llmount.sh to /usr/lib/lustre/tests/llmount.sh I believe.

On Thu, Nov 18, 2021 at 1:45 PM STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>> wrote:
Not sure what you mean by “If you install the test suite”. I am not seeing a llmount.sh file on the server using “locate llmount.sh” at this point. What are the steps to install the test suite?

Dean

From: Colin Faber <cfaber at gmail.com<mailto:cfaber at gmail.com>>
Sent: Thursday, November 18, 2021 1:34 PM
To: STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>>
Cc: lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>
Subject: Re: [lustre-discuss] Lustre and server upgrade

Hm.. If you install the test suite does llmount.sh succeed? This should setup a single node cluster on whatever node you're running lustre on, I believe it will load modules as needed (IIRC), if this test succeeds, then you know that lustre is installed correctly (or correctly enough), if not, I'd focus on the installation as the target issue may be a redheirring

-cf


On Thu, Nov 18, 2021 at 1:01 PM STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>> wrote:
Thanks for the fast reply.
When I do the tunefs.lustre /dev/sdX command I get:
Target: <name>-OST0009
Index: 9

Target: <name>-OST0008
Index: 8
I spot checked some others and they seem to be good with the exception of one. It shows:

Target: <name>-OST000a
Index: 10

But since there are 11 LUNs attached that make sense to me.

As far as the upgrade it was a fresh install using the legacy targets as the OSS and MDS nodes are virtual machine with the LUN disks attached to them so that Red Hat sees them as /dev/sdX devices.

When I loaded Lustre on the server I did a yum install lustre and since we were pointed at the lustre-2.12 repo in our environment it picked up the following RPMs to install:
Luster-resource-agents-2.12.6-1.el7.x86_64
Kmod-lustre-2.12.6-1.el7.x86_64
Kmod-zfs-3.10.0-1160.2.1.el7_lustre.x86_64-09.7.13-1.el7.x86_64
Kmod-lustre-osd-zfs-2.12.6-1.el7.x86_64
Lustre-2.12.6-1.el7.x86_64
Kmod-spl-3.10.0-1160.2.1.el7_lustre.x86_64-09.7.13-1.el7.x86_64
Lustre-osd-zfs-mount-2.12.6-1.el7.x86_64
Lustre-osd-ldiskfs-mount-2.12.6-1.el7.x86_64

Dean

From: Colin Faber <cfaber at gmail.com<mailto:cfaber at gmail.com>>
Sent: Thursday, November 18, 2021 12:35 PM
To: STEPHENS, DEAN - US <dean.stephens at caci.com<mailto:dean.stephens at caci.com>>
Cc: lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>
Subject: Re: [lustre-discuss] Lustre and server upgrade


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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<mailto: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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