[Lustre-discuss] Lost folders after changing MDS

Alastair Ferguson aferguson at cmcrc.com
Sat Feb 16 22:31:20 PST 2013

Thanks for the email Andreas - I actually sorted this one out. I recopied the MDS database and it worked. I think the unzipping process didn't finish properly the first time.

I now have a fully functional 95TB backup filesystem.

Alastair Ferguson
IT Manager
Capital Markets CRC Limited (CMCRC)
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On 16/02/2013, at 7:11 PM, "Dilger, Andreas" <andreas.dilger at intel.com> wrote:

> On 2013-02-14, at 9:46, "Alastair Ferguson" <aferguson at cmcrc.com<mailto:aferguson at cmcrc.com>> wrote:
> OK, so our old MDS had hardware issues so I configured a new MGS / MDS on a VM (this is a backup lustre filesystem and I wanted to separate the MGS / MDS from OSS of the previous), and then did this
> When you write that your files are missing, do you mean that they do not appear with "ls -l", or that they are present but contain no data?
> I also upgraded from 1.8.8 to 2. I managed to mount the Lustre filesystem
> Just as a general sysadmin rule, doing too many things at once makes it difficult to figure out what went wrong.
> Was it the data migration?  Splitting off the MGS? Upgrading to 2.x (you don't report which version)?
> However, there are hardly any files or folders there - most of them have disappeared, but they are clearly on the OSTs (according to the above command). Is there any way I can reindex the OST'S / MDS to recognise the files and folders properly?
> Do you still have the old MDT storage? Have your mounted the new MDT as type ldiskfs to see if your files are there?  They would be located below the "ROOT/" directory inside the MDT filesystem.
> Cheers, Andreas
> <image.png>

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