when you say 'synchronous write' what do you mean by that ? if you are talking about using direct i/o (O_DIRECT flag), they don't leverage HAWC data path, its by design.
sven On Mon, Aug 1, 2016 at 11:36 AM, Tejas Rao <[email protected]> wrote: > I have enabled write cache (HAWC) by running the below commands. The > recovery logs are supposedly placed in the replicated system metadata pool > (SSDs). I do not have a "system.log" pool as it is only needed if recovery > logs are stored on the client nodes. > > mmchfs gpfs01 --write-cache-threshold 64K > mmchfs gpfs01 -L 1024M > mmchconfig logPingPongSector=no > > I have recycled the daemon on all nodes in the cluster (including the NSD > nodes). > > I still see small synchronous writes (4K) from the clients going to the > data drives (data pool). I am checking this by looking at "mmdiag --iohist" > output. Should they not be going to the system pool? > > Do I need to do something else? How can I confirm that HAWC is working as > advertised? > > Thanks. > > > _______________________________________________ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > http://gpfsug.org/mailman/listinfo/gpfsug-discuss >
_______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
