[collectd] filesystem performance tuning for SSD RAID-5

[christopher barry]

On Fri, 2013-02-15 at 14:57 +1030, Jesse Reynolds wrote:
> Hello, 
> 
> We're building a new collectd + RRD server on Ubuntu 12.04. I'm
> wondering if anyone has any thoughts on filesystem tuning (and
> filesystem format). We have created a ~1 TB RAID 5 volume over local
> SSD drives for the RRD filesystem. 
> 
> Is there a favoured filesystem? Currently it's ext4. Should we
> consider / benchmark anything else? 
> 
> Normally I think smaller block size is recommended for RRD file
> systems, but given we have pretty large RRD files (eg 30 MB - we keep
> a lot of high resolution metrics) - perhaps this isn't as important? 
> 
> Journaling? 
> 
> mount options:
> - noatime
> - nodiratime
> - discard
> - anything else?
> 
> Does the libeatmydata LD_PRELOAD library help smooth out disk IO /
> increase effective throughput? 
> 
> Thanks for your thoughts!
> 
> Jesse
> 
> 
> 

Looks like you've done your homework - I would only say to make sure you
are aligned on the SSD blocks.

Not sure if rrdcached would be useful for you or not.

-C