I am talking about kernel RAMDISKS there, not solid state disks. I would
have to agree that the ide interface would probably be a big bottle neck.

I wrote down what I did BTW:
http://www.quadratic.net/index.php?target=http://www.quadratic.net/reference
/ramdisk500.html

        As an aside, google has been working hard to contribute a much
imporoved ide driver that will let you get close to 80% efficiency on 2 IDE
channels each with a single disk. Check out :
http://technetcast.com/tnc_play_stream.html?stream_id=420 (alert: geek
factor high , the issue they talk about are the same issues I deal with
daily )

Please note...
all queue's for a given server instance must be on the same disk (or kernel
ramdisk as the case may be).

I argued long and hard with a client who want me to dump "defered" mail to
disk, to let "fast" mail past saying that it could not be done.
However I think there is a work around.

I think you could set the transport for "defered" to a relay host that is
just another instance running on the same server (on a different interface)
that is using a proper disk for queues.

anyone care to comment?

david

---
David Thornton
ATT Canada - Internet Data Centre Services
Me: dthorntoncorp.attcanada.ca 905-896-6263
My Department: Internet Data Centre Services supportboaw.net 905-896-6386
My Supervisor: Mike Molson mmolsoncorp.attcanada.ca 906-896-6268 
> -----Original Message-----
> From: Chip Paswater [mailto:turk182chipware.net]
> Sent: Friday, September 28, 2001 2:19 AM
> To: David Thornton; postfix-userscloud9.net
> Subject: Re: 1.000.000 email posted in a single delivery process
> 
> 
> > We have a "Really Big UPS"(tm), so I feel completely 
> comforatble using a ram
> > disk for queues, in fact I played with linux 2.2 and found 
> the the limit to
> > a single ram disks size was 525 Megs. Linux 2.2 has a limit 
> of 2 GB for ram
> > so we found a nice balance with 3 X 525 Ram disks and ~500 
> Megs of system
> 
> You're talking about a kernel RAMDISK and not one of those solid state
> ramdrives?  Performance wise, how do they compare to each other?  I'm
> assuming the ramdisk is the fastest because you're not going 
> through an IDE
> bus to get the data...?
> 
> And I assume postfix can handle multiple queue directories?  
> I wouldn't
> mind having a 256M ramdisk for everyday queues, and then a 
> larger 2-3 gig
> queue for the days when I lose a T3 or two.  Can I 
> preferentiate the ramdisk
> over the hardisk, so that postfix won't start using the 
> harddisk until the
> 256M ramdisk is full?
> 
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