On 24 Apr 2000, at 14:36, Derek kelly wrote:
>
> The question this raises with me is- I wonder if going to Gigabit
> between
> the devices negates the speed issue.
>
>
I can't speak about Sybase, but I'm running Oracle across Gigabit.
In terms of the pipes size, I've never come close to 100MB/s. My
F740 filers seem to top out at around 20MB/s. I "think" it's
helping, in that there is less latency on the connection. But the
problem I see mostly is high biod utilization under high i/o load
(I'm running across nfs). Expecially things like creating
tablespaces. On a 4 processor system (rs/6k-f50) I've seen biod run
as high as 30% of the system. My disappointment is that NetApp
doesn't supported gigabit jumbo packets, even though they announced
they would support them quite a while ago when they first announced
support for gigabit. I notice that those announcement letters are no
longer available on their web site. A search for "jumbo" turns up
nothing, where it used to turn up an announcement letter for Alteon
nics and jumbo packets. Every db block (4k) thats read from the db
requires 2.x ethernet packets. Under low utilization I never see
the nfs load, under high utilization it becomes a monster. If Netapp
is serious about wanting to run databases on the NetApp they need to
support jumbo packets.
Rick