to the question of how and why backuppc server would 'know' where the aoe
disk are, aoe is actually a protocol like like IP. it is only visible on
the same network, as in no routing possible, period. the aoe module in the
kernel looks at the local network and can see all the local aoe nodes
because they are so close** meaning they look like they are all in the same
room so it is quite easy to find the guy standing next to you :)
that is the big advantage to aoe, as well as being such a low level protocal
that it skips TCP/IP overhead and can give near-wire speeds. I can pull
11.7MB/s off 12.5MB/s 100Mb ethernet and 116MB/s off gigabit, which is about
as good as it gets.
keep in mind that these need to be on the same physical network, not on a
network across the country. if you need to get further than that, you need
to use iSCSI.
iSCSI is a bit more complicated, but it is not so bad either. with iSCSI
you just need to make each target have a specific name in a FQDN type
format. You can put that in DNS if you like but you can also tell an
initiator aka 'client' the IP address of the disk target so you dont have to
mess with DNS. What is nice about iSCSI is that it is routable. and it also
is using scsi packets. aoe is using ATA packets and while iscsi is using
scsi packets, scsi packets being a bit more efficient in format meaning that
though aoe can have a bit higher thoroughput, iscsi can do a bit better on
I/O.
On Tue, Jul 22, 2008 at 1:09 PM, Kurt Tunkko <[EMAIL PROTECTED]> wrote:
> Hey Dan,
>
> dan wrote:
> > AOE is quite simple.
>
> :-o ... wait, not THAT simple ... simple is something like: throw in
> coin here -> get a beer :-)
>
> I just think that I don't fully understand the concept of AOE and how I
> can apply your setup in order to back our server to a 3rd harddrive that
> is NOT in the same room like our server.
>
> As far as I understand your idea, I would setup an other-machine that
> will have one harddrive/parition configured as AOE.
>
> BackupPC-Server -> network -> other-machine -> AOE-Disk
>
> have I understand this right - since we have lots of spare machines
> available there wouldn't be a problem setting up another one.
>
> BUT I don't get how the backuppc-server "knows" where the AOE disk is?
> sounds like magic.
>
> If it's not to offtopic I would like to ask if you can add some more
> newbie-friendly information how this is working, maybe using the names
> backuppc-server (that wants to add the AOE-device to its RAID) and
> aoeserver (that has the real drive built in).
>
> thanks a lot - I'm looking forward to make some testing
>
> - Kurt
>
> dan wrote:
> > [...] on ubuntu you can build a target like this
> >
> > have a spare drive/partition/lvm!
> > sudo apt-get install vblade
> > vblade 0 0 eth0 /dev/sdc
> >
> > thats it! now you are exporting a device on shelf 0, slot 0 (vblade 0 0)
> >
> > on another machine
> > sudo apt-get install aoetools
> > modprobe aoe
> >
> > you should now see /dev/etherd/e0.0 (this is the shelf 0, slot 0 drive
> > from the other machine)
> >
> > done!
> >
> > a 'client' can see any aoe device on the network, without even having an
> > IP address. IP is not used at all on aoe.
> >
> > now on the 'client' machine, you can
> > "mkfs.ext3 /dev/etherd/e0.0 && mkdir /mnt/e0.0 && mount /dev/etherd/e0.0
> > /mnt/e0.0"
> >
> > or better yet, add it to your raid array with mdadm.
>
>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> BackupPC-users mailing list
> BackupPC-users@lists.sourceforge.net
> List: https://lists.sourceforge.net/lists/listinfo/backuppc-users
> Wiki: http://backuppc.wiki.sourceforge.net
> Project: http://backuppc.sourceforge.net/
>
-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
BackupPC-users mailing list
BackupPC-users@lists.sourceforge.net
List: https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki: http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/
