[ENBD] reconnection

[cereal killer]

Hi Peter and thanks for the answer ; 

 --- "Peter T. Breuer" <ptb at it.uc3m.es> a écrit : >
"Also sprach [cereal killer]:"
> > I'm quite newbie in the world of enbd and High
> > Availability.
> 
> Hi.
> 
> > I m running a 2.4 succesfully patched kernel .
> 
> But the kernel should not be patched .. can you
> clarify what you mean?
>
I just apply the patch given with 2.432pre , to have
the new options in the menuconfig in the kernel. 
 
> > I export my /dev/hda9 with the enbd-server 5000 -i
> > test -b 2048 /dev/hda9 command. works i connect on
> th
> > eother side with the client ; enbd-client
> server:5000
> > -i test -b 2048 -n 4 /dev/nb0 
> 
> Well, this is not the enbd device naming scheme. You
> would need
> /dev/nda (at least if this is enbd-2.4.31, I think
> enbd-2.4.32 can cope
> with it).
>
I use a 2.432; it copes with it. Anyway I can make the
nda to suit your instructions , will probably better.
 
> > where nb0 has 43 0 major minor , connection is ok
> ;
> 
> Are you sure? It's hard to imagine how!
> 
> > mount the nb0 on /home/test on client side.
> > Then i generate a lot of writes and reads with dd
> on
> > /home/test ; and now comes the problem : I
> simulate a
> > failover (oops the network cable is in my hand :p
> )
> > all stalls ; i kill the enbd-server , and restart
> it ;
> > but no way of reconnection on client side. How to
> do a
> 
> Every way of reconnecting it - send SIGPWR to the
> client, or install the
> enbd-cstatd and enbd-sstatd daemons, and configure
> enbd.conf.
>
In a production use ; i cant be behind the clinet side
to send the signal ; so I will install this 2 deamons
and configure that enbd.conf.
 
> > quite quickly reconnection working ? Isnt enbd
> > supposed to do it automatically ? 
> 
> Well, if the administrator "reads the instructions"
> up till the end of the
> first paragraph ...
> 
>    You will also need the /dev/nda nda1 nda2 ...
> /dev/ndb ndb1 ndb2 ...
>    entries. Make them with the included MAKEDEV
> script.

Done
> 
> And you'll also need this bit:
> 
>    
>    The best way to set up is to look in the nbd/etc
> subdir of the
>    distributed archive.  There you will find a
> /etc/enbd.conf and an
>    /etc/init.d/enbd file.  Write the details of the
> server or client (or
>    both) that should run on the local host in the
> enbd.conf file, as
>    indicated there and on its manpage, and then
> simply run
>    /etc/init.d/enbd start.  Do the same on the
> remote machine.
> 
> and
> 
>   "make install" now insidiously and perniciously
> adds two services
>   enbd-{s,c}statd to /etc/services, and a line to
> /etc/inetd to start
>   them on demand.  Comment these lines if you don't
> like them.
> 
> I would guess that you don't have /etc/enbd.conf,
> nor enbd-cstatd
> running out of inetd.
> 
> Peter
Thanks Peter ; will try to read more and understand
faster next time. 
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