[SunHELP] remote ufsdump

[Michael Conlen]

Let's go uncompressed:compressed with AIT-2. One drive will pull
6MB/sec:15.6MB/sec [their compression numbers]*. Let's translate to
networking stats, that's 48Mb/sec:124.8Mb/sec. There you go, your 100Mb
connection is toast. If you use more then one drive then your really going
to blow it.

In setting up a network backup server I recomend a gigE port for the server.
I remember Cisco makes a switch with 100Mb/sec ports and 1 gigE port. This
works well, except the damn Sun cards can't auto negotiate with the switch
(bastards!). This works well 'till you have 8 drives, then, well, at that
point your going to be buying an E450 or larger just to do backups
(presuming your going to 8 drives at once durring the backup).

*do you belive their compression numbers? I'll let you know how AIT-2 does
with our data when budget is free again.

--
Groove On Dude
Michael Conlen
Obfuscated Networking
meconlen at obfuscated.net


> -----Original Message-----
> From: sunhelp-admin at sunhelp.org [mailto:sunhelp-admin at sunhelp.org]On
> Behalf Of Brian Hechinger
> Sent: Wednesday, May 30, 2001 12:49 PM
> To: sunhelp at sunhelp.org
> Subject: Re: [SunHELP] remote ufsdump
>
>
> > Regards,
> >         How fast would be the remote dumping speed? does it
> depend on the
> > tape drive it self or the connection between them?
>
> usually the tape drive.  a DDS4 drive (the fastest 4mm that i
> know of) can only
> backup at a data rate of 2.4Mbps (native, compression doesn't
> make the network
> work harder, it just sends more data per bps) so not even close
> to a 10Base
> connection, hell, a T1 wouldn't even slow you down that much.
>
> the fastest tape i know of are the Mammoth and AIT 8mm drives.
> both can do
> roughly 60Mbps so 10Base would seriously limit you, but 100Base
> would be more
> than adequate.
>
> and if you backup to some freaky beast that has a HDD pool, then you could
> saturate your network, no matter what type it is.
>
> so, in summary, for the most part, modern networking technology
> far exceeds
> tape drive speeds.  for the time being, you never know what will happen in
> the future, but of course there is always GigE to cover that. :)
>
> cheers,
>
> -brian
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