[Lustre-discuss] advice on OST journals in OSS failover pairs

[Andreas Dilger]

One known issue is that the memory requirements on the clients is increased with async journals in the case of few clients writing to the filesystem. 

Cheers, Andreas

On 2011-02-13, at 17:24, Oleg Drokin <green at whamcloud.com> wrote:

> Hello!
> 
> On Feb 13, 2011, at 7:18 PM, Samuel Aparicio wrote:
> 
>>> Also you might want try async journal commits (+ make your journals big) to see if that improves your performance in a similar way to an external journal.
>> we thought about testing this but I also saw a number of bug reports around async commits in failover configurations. Is this stable/available for 1.8.5?
> 
> It is believed that all bugs are currently fixed.
> I believe that Oak Ridge National Laboratory uses async journals for quite a while on their systems.
> There are some other big users, I think.
> 
> Bye,
>    Oleg
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