[lustre-discuss] OST is not mounting

[Andreas Dilger]

The OST went read-only because that is what happens when the block device disappears underneath it. That is a behavior of ext4 and other local filesystems as well. 

If you look in the console logs you would see SCSI errors and the filesystem being remounted read-only. 

To have reliability in the face of such storage issues you need to use dm-multipath. 

Cheers, Andreas

> On Nov 5, 2023, at 09:13, Backer via lustre-discuss <lustre-discuss at lists.lustre.org> wrote:
> 
> - Why did OST become in this state after the write failure and was mounted RO.  The write error was due to iSCSI target going offline and coming back after a few seconds later.