[lustre-discuss] Recovering MDT failure

[Andreas Dilger]

On Apr 27, 2023, at 02:12, Ramiro Alba Queipo <ramiro.alba at upc.edu<mailto:ramiro.alba at upc.edu>> wrote:

Hi everybody,

I have lustre 2.15.0 using Oracle on servers and Ubuntu 20.04 at clients. I have one MDT on a raid 1 SSD and the two disk have failed, so all the data is apparently lost.

- Is there a remote posibility to access data on OSSTs without MDT?
- When I started this system I tried to backup MDT data without succes. I there any procedure to backup data which I got, but also to recover it which I did not achieve?

Any help/suggestion es very welcomed
Thanks in advance.

Regards

Depending on the file layout used, the files on the OSTs are "just files", if you can mount the OSTs as type ldiskfs (or ZFS if that is the way you configured it).  The default file layout is one OST stripe per file, so you could read those files, and the UID/GID/timestamps should be correct, but there will not be any filenames associated with the files.

Regards, Andreas
--
Andreas Dilger
Lustre Principal Architect
Whamcloud







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