Re: [lustre-discuss] OST recovery

[Andreas Dilger]

It would be useful if you provided the actual error messages, so we can see 
where the problem is.

What command did you run on the OST?

Does the OST still show that it has data in it (e.g. "df" or "dumpe2fs -h" 
shows lots of used blocks)?

On Mar 25, 2020, at 10:05, Gong-Do Hwang 
mailto:grover.hw...@gmail.com>> wrote:

Dear Lustre,

Months ago when I tried to add a new disk to my new Lustre FS, I accidentally 
target the mkfs.lustre to a then mounted OST partition of another Lustre FS. 
Weird enough the command passed through, and without paying attention to it, I 
umount the partition months later and couldn't mount it back, then I realized 
the mkfs.lustre command was legit.

But my old lustre FS worked well through these months, so I guess the data in 
that OST is still there. But now the permanent CONFIG/mountdata is the new one, 
and I can still see my old config in the previous value.

My question is is there any way I can write back the old CONFIG/mountdata and 
still keep all my files in that OST?

I am using Luster 2.13.0 for my mgs/mdt/ost

Thanks for your help and I really appreciate it!

Grover
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Cheers, Andreas
--
Andreas Dilger
Principal Lustre Architect
Whamcloud






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Re: [lustre-discuss] Lustre server build on CentOS 8

[Peter Jones]

Valerie

The first Lustre release to officially support CentOS 8.x servers is set to be 
the upcoming Lustre 2.14 release and so you are into slightly unchartered 
terrirory. The simplest way forward may depend upon what you are trying to do - 
if you are looking to run some tests then using the master branch should work, 
but if you want to run into production then you would have to port the Centos 
8.x patch series from master to the 2.12.x branch (either building from source 
or downloading packages from Jenkins) if you want to run ldiskfs. Lustre on ZFS 
could be simpler but you would need to use ZFS 0.8.x rather than the current 
default version of 0.7.13 used for 2.12.4.

Peter


On 2020-03-29, 7:12 AM, "lustre-discuss on behalf of Valerie Hayot" 
 
wrote:

Hi,

I have a few CentOS 8 servers that I’d like to use as Lustre servers, 
preferably without having to downgrade to CentOS 7. Is it known if the el7 
packages of the latest release (2.12.4) are expected to work reasonable well on 
CentOS 8?


Thank you,

Valerie

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[lustre-discuss] Lustre server build on CentOS 8

[Valerie Hayot]

Hi,

I have a few CentOS 8 servers that I’d like to use as Lustre servers, 
preferably without having to downgrade to CentOS 7. Is it known if the el7 
packages of the latest release (2.12.4) are expected to work reasonable well on 
CentOS 8?


Thank you,

Valerie

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