Re: [Openqrm-user] simple aoe question

[thohal <th...@li...>]

Am Samstag, den 19.07.2008, 00:21 +0200 schrieb Jean Spirat: 
> > If you're interested in HA-Storage-Box i could send you a Documentation
> > how to setup such a HA redundant Storage-Box...
> >  
> >   
> >> re
> 
> thanks for your post, yes indeed i am interested :)

At the moment im at a customer migrating bunches of servers, as soon i'm
in office i will send you the Howto.

But in short.... install 2 boxes with small /-FS, swap and dont let some
space for aoe-devices.. install drbd on both boxes, since V8 also
active/active is possible

apt-get install drbd8-utils drbd8-module-source drbd8-source
build-essential linux-headers-'uname -r' 

m-a a-i drbd8-module-source && update-modules && modprobe drbd

Edit the /etc/drbd.conf 

#/etc/drbd.conf

global {

    usage-count yes;

}

common {

  syncer { rate 28M; }

}

resource r0 {

  protocol C;

  handlers {

    pri-on-incon-degr "echo o > /proc/sysrq-trigger ; halt -f";

    pri-lost-after-sb "echo o > /proc/sysrq-trigger ; halt -f";

    local-io-error "echo o > /proc/sysrq-trigger ; halt -f";

    outdate-peer "/usr/sbin/drbd-peer-outdater";

  }

  startup {

  }

  disk {

    on-io-error   detach;

  }

  net {

    allow-two-primaries;

    after-sb-0pri disconnect;

    after-sb-1pri disconnect;

    after-sb-2pri disconnect;

    rr-conflict disconnect;

  }

  syncer {

    rate 27M;

    al-extents 257;

  }

  on node1 {

    device     /dev/drbd0;

    disk       /dev/sda3;

    address    192.9.205.1:7788;

    flexible-meta-disk  internal;

  }

  on node2 {

    device    /dev/drbd0;

    disk      /dev/sda3;

    address   192.9.205.2:7788;

    meta-disk internal;

  }

}

And export /dev/drbd0 through aoe or create a PV from this... Sending you a nice howto, when im back...

> Raid 1 or drdb i do not know which one will perform the best in this 
> case. Raid comes with every kernel i am not sure if drdb do not need 
> special kernel module ?

You do not need drbd in your nodes booted by qrm - it's just running on
your storage-boxes which server the aoe-Devices...

Just one question: have you ever tried setting install_to=/dev/md0? IIRC
it maybe could work oob, since we're working with standard-kernels..
Never tested, since i do this job on Server-Side and not on the
Nodes....

> 
> regards,
> Jean


regards,

Thomas