Re: Re: Re: PostgreSQL over NFS?

* tc lewis <tcl@bunzy.net> [010209 17:02] wrote:
>
>
> On Fri, 9 Feb 2001, Alfred Perlstein wrote:
>
> > * tc lewis <tcl@bunzy.net> [010209 16:47] wrote:
> > >
> > > On Fri, 9 Feb 2001, adb wrote:
> > > > I've heard of other people running databases on a Netapp Filer
> > > > I think this is generally ok because the netapp has a special
> > > > write cache in NVram and that's what makes it so fast.
> > > >
> > >
> > > yeah, basically a write returns almost instantaneously (or much closer
> > > than comparative to your normal machine writing to disk at least) with a
> > > netapp filer.  they're very fast.  and also very expensive.
> >
> > You can also get a raid with battery backup, this would achieve
> > pretty much the same thing.
> >
>
> how's that?  storage arrays will require you to use a filesystem that your
> operating system supports.  or do some storage array companies provide
> their own filesystems and drivers for misc systems?  same thing i guess.

It has a persistant write cache, meaning it can ACK a write as being
sync'd to disk even if it's only been copied into the RAID's memory
cache (because it's persistant).  Same thing that netapp does.

--
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
"I have the heart of a child; I keep it in a jar on my desk."