[Lustre-discuss] Questions about OSC cache

[Dilger, Andreas]

This limit is per OSC/OST. When the limit is hit, writes to this OST will stall, but other writes may proceed if they are not using the stalled OSC. 

Cheers, Andreas

> On Jan 14, 2015, at 23:20, teng wang <tzw0019 at gmail.com> wrote:
> 
> Hi,
> 
> I know OSC's buffer is tunable by max_dirty_mb.
> Is this max_dirty_mb for each object?
> If so, what if max_dirty_mb is reached? Will
> the OSC stall until all the data belonging to
> this object is flushed, or it will stall until
> other object's cache is also flushed? or
> The client will only stall for write on the 
> object whose cache is full but continue
> to buffer the dirty data belonging to other objects?
> 
> Thanks,
> Teng
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