[lustre-discuss] Stop writes for users

[Robert Redl]

I don't know is this really works for this use case, but newer Lustre
versions have the possibility to create a write barrier, which is
normally part of the snapshot process.

Have a look at lctl barrier_freeze.

On 5/14/19 5:25 PM, Mohr Jr, Richard Frank (Rick Mohr) wrote:
>> On May 13, 2019, at 6:51 PM, Fernando Pérez <fperez at icm.csic.es> wrote:
>>
>> Is there a way to stop file writes for all users or for groups without using quotes?
>>
>> We have a lustre filesystem with corrupted quotes and I need to stop the write for all users (or for some users).
> There are ways to deactivate OSTs, but those are intended to stop creation of new file objects on those OSTs and don’t actually stop writes to existing files.  I don’t think that mounting OSTs read-only  (with “mount -t lustre -o ro …”) works because Lustre updates some info when it mounts the target (but this might be based on old info so I could be wrong).  You could remount all the clients read-only, but I don’t know if this is practical for you.
>
> The only other option I can think of would be if there was a client-side parameter that could be set via “lctl conf_param” that might cause the clients to treat all the targets as read-only.  But if there is such a parameter, I am not familiar with it.
>
> --
> Rick Mohr
> Senior HPC System Administrator
> National Institute for Computational Sciences
> http://www.nics.tennessee.edu
>
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-- 

Dr. Robert Redl
Scientific Programmer, "Waves to Weather" (SFB/TRR165)
Meteorologisches Institut
Ludwig-Maximilians-Universität München

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