[Users] Re: slow fsync rate

[Benny Amorsen]

Dietmar Maurer <dietmar-YTcQvvOqK21BDgjK7y7TUQ at public.gmane.org> writes:

> We use reasonable RAID controllers with BBU here. Such controller can handle > 1000 fsync/sec. So IMHO above argument does not count at all.

Can they though? I've seen SmartArray controllers with BBU delivering
just 5 synchronous IOPS when doing RAID-5. At first they were fast but
soon the cache filled and they apparently weren't smart enough to
combine multiple updates to the same disk area into one write.


/Benny