[ZODB-Dev] Use of fsync in FileStorage

[Jens Vagelpohl]

> I'm most interested in the first kind of system, "server-class"
> configurations.  Serious users with heavy loads run those, and they 
> probably
> have the most to lose if the database goes bad.  If it's generally 
> true that
> fsyncs really don't hurt them much, that makes a tempting default.
>
> If possible, I'd like to see some timings from the kinds of boxes you 
> run in
> production.  I'd also like to know whether an option to run with *no* 
> fsyncs
> would be interesting to you.  You should answer that last one twice:  
> once
> before running timings, then again after <wink>.

Tim, maybe you can ask Andrew to run this on the boxes that are being 
used as storages in the cluster. I know that with the version of ZEO we 
are using the busiest storages were already totally I/O-bound and 
adding more I/O load would be highly problematic. We had many instances 
where the cluster as a whole started to slow down because the storage 
box became too busy, and you can imagine that that's a recipe for 
disaster...

jens