[lustre-discuss] [EXTERNAL] mdt and mgt are always in RO mode

[Ran Mo]

Thanks Rick a lot. You save me from keeping reinstalling Lustre/troubleshooting why it is in RO. :)

Sorry, I am new to Lustre. I am trying to setup and test two functions below.
1) Use Lustre's identity feature to create users on the client side, and require user to be authenticated at Lustre server n before allowing them to access the file system.
2) Enable the nodemap feature to enforce user data isolation; Create Tenant A and Tenant B, and ensure that each tenant can only mount and see data within their respective subdirectories of the file system.

For test 1), per research , looks like there is a need to install Lustre_id at client side but I just cannot find it.
For test 2), per research , ChatGPT asked me to create two sub directories (for examples, mkdir /mnt/mdt/{tenantA,tenantB}) under mount point of MDT (/mnt/mdt) on MDS server but since it is RO mode, I am not allowed to do so. That's where I have been stuck for test 2). (:

Not sure if you can share your ideas on these.

Environment:
3 Rocky8.10 VMs (MDS+MGS on server1, the other two are OSS). Two Ubuntu VMs (22.04) as client. All is running Lustre 2.15.7.

Thanks again.
Ran

________________________________
From: Mohr, Rick <mohrrf at ornl.gov>
Sent: Wednesday, August 6, 2025 2:16 AM
To: Ran Mo <HenryMo2012 at outlook.com>; lustre-discuss at lists.lustre.org <lustre-discuss at lists.lustre.org>
Subject: Re: [EXTERNAL] [lustre-discuss] mdt and mgt are always in RO mode

Ran,

This is normal.  The MGTs/MDTs/OSTs will always show up as read-only in the output from the "mount" command, even when the lustre file system is writable.

--Rick



On 8/5/25, 1:15 PM, "lustre-discuss on behalf of Ran Mo via lustre-discuss" <lustre-discuss-bounces at lists.lustre.org <mailto:lustre-discuss-bounces at lists.lustre.org> on behalf of lustre-discuss at lists.lustre.org <mailto:lustre-discuss at lists.lustre.org>> wrote:


Greenings,

I tried installed Lustre many time (both 2.15.6 and 2.15.7) but mdt and mgt are always under read only mode.
=====
[root at mds_node ~]# mount | grep nvme
/dev/nvme0n1p1 on /boot type xfs (rw,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota)
/dev/nvme0n2 on /mnt/mgt type lustre (ro,svname=MGS,nosvc,mgs,osd=osd-ldiskfs,user_xattr,errors=remount-ro)
/dev/nvme0n3 on /mnt/mdt type lustre (ro,svname=lustrefs-MDT0000,mgsnode=192.168.31.20 at tcp0:192.168.31.20 at tcp,osd=osd-ldiskfs,user_xattr,errors=remount-ro,_netdev)
[root at mds_node ~]#

I tried umount and mount and other methods, but unfortunately, cannot get it into RW mode.

Can you give me a hint please? Thanks,

Ran



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