On Thursday, August 05, 2010, Mark Kirkwood <mark.kirkw...@catalyst.net.nz> wrote: > Normally I'd agree with the others and recommend RAID10 - but you say > you have an OLAP workload - if it is *heavily* read biased you may get > better performance with RAID5 (more effective disks to read from). > Having said that, your sequential read performance right now is pretty > low (151 MB/s - should be double this), which may point to an issue > with this controller. Unfortunately this *may* be important for an OLAP > workload (seq scans of big tables).
Probably a low (default) readahead limitation. ext3 doesn't help but it can usually get up over 400MB/sec. Doubt it's the controller. -- "No animals were harmed in the recording of this episode. We tried but that damn monkey was just too fast." -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
