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

[Oleg Drokin]

True. Each client might pin memory amount equal to amount of written data from this client for up to 7 seconds.

On Feb 13, 2011, at 9:07 PM, Andreas Dilger wrote:

> 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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