Re: XFS and DPX files

Eric Sandeen
2009-11-02T21:34:23Z

AndrewL733@aol.com wrote:
>
>> Maybe you should try mounting the XFS filesystem with these options :
>> nobarrier,noatime
>>
>>
> Thanks. Already doing that -- 3ware controller does not support
> barriers, so that's automatically ruled out (you see a message in the
> syslog when mounting the filesystem that barriers will not be used).
> Already mounting with "noatime". Also have been trying "filestreams".

Filestreams is really only useful if you have multiple threads writing
in this manner - for example 2 different movie streams.

Normally an allocation group is chosen for all new files in a directory,
so if you have 2 streams to 2 directories you are writing to 2 ag's ...
all is good until those ags get full and things spill over. At that
point you may wind up interleaving those files from both streams in a
3rd ag.

the filestreams option more or less locks out the new ag from other
streams, so that stuff stays segregated.

If this is your situation (multiple streams, each to their own
directory), then filestreams may help. I think for a single stream of
files, for a single video source, it won't matter.

-Eric