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 <[email protected]>
Sent: Wednesday, August 6, 2025 2:16 AM
To: Ran Mo <[email protected]>; [email protected]
<[email protected]>
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"
<[email protected]
<mailto:[email protected]> on behalf of
[email protected] <mailto:[email protected]>> 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@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@tcp0:192.168.31.20@tcp,osd=osd-ldiskfs,user_xattr,errors=remount-ro,_netdev)
[root@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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