[lustre-discuss] MGT and MDT are ro | read only

[Andreas Dilger]

This is "normal" because the MDT and MGT mountpoints are not directly writable. 

However, it is also a source of confusion for users and has been fixed in 2.16 to show the
current state of the underlying filesystem. 
 
Cheers, Andreas

> On Oct 12, 2025, at 01:36, Philippe Weill via lustre-discuss <lustre-discuss at lists.lustre.org> wrote:
> 
> Hrllo
> 
> it's normal behaviour on 2.15 in lustre server
> 
> 
>> On 12/10/2025 09:18, Ihsan Ur Rahman via lustre-discuss wrote:
>> Hello lustre folks,
>> I have freshly installed lustre 2.15.7. when i do the mount | grep lustre. ong the MGS-MDS node.  I see the output below.
>> mount | grep lustre /dev/nvme0n1 on /mnt/mgs type lustre (ro,svname=MGS,nosvc,mgs,osd=osd-ldiskfs,user_xattr,errors=remount-ro) / dev/nvme1n1 on /mnt/mdt0 type lustre (ro,svname=lust-das-MDT0000,mgsnode=10.x.x.x at o2ib,osd=osd-ldiskfs,user_xattr,errors=remount- ro) /dev/nvme2n1 on /mnt/mdt1 type lustre (ro,svname=lust-das-MDT0001,mgsnode=10.x.x.x at o2ib,osd=osd- ldiskfs,user_xattr,errors=remount-ro).
>> MGS and MDS are on the same node.
>> is this behaviour normal OR requires attention.
>> i can create directory and files on the lustre and can mount the lustre on the clients nodes.
>> regards,
>> ihsan ur rahman
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> 
> --
> Weill Philippe -  Administrateur Systeme et Reseaux
> CNRS/UPMC/IPSL   LATMOS (UMR 8190)
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