[DRBD-user] 3 simple questions for a nifty setup

[ephigenie at g-house.de]

Hello Everyone,

I've managed to get drbd-07.11 to work with 2 sarge boxes,
but there a few questions open at this point :

whenever i try to mount the drbd/0 device on the secondary,
i get the following ...
but the device is not mounted (according to /proc/mounts & mtab etc..)
the mountpoint has no influence on that behaviour since when i try
an other one, it works ?

---snipp----------
www-2:/# mount -t ext3 /dev/drbd/0 /ha/
mount: block device /dev/drbd/0 is write-protected, mounting read-only
mount: /dev/drbd/0 already mounted or /ha/ busy
---snapp----------

the second one :

i'd like to make some webspace ha - this should work i think
but as I'm lazy, i concidered using drbd for a mysql instance
but there's my question - are there any problems known with that ?

for sure i will sort all writeaccess out and direct it to the master
but this seems to me more smart than using the mysql - replication

Is there anyone who has this as a working setup or has experiences with that ?

the third one :
at the moment there are only 2boxes, but a third and a forth a prepared ...
but i searched the half web for that and had nothing found -

so is it possible to have 1 primary and 3 or more secondarys ?
What about choosing the next primary - can heartbeat do that job - or is
this just for the head-to-head config everywhere mentioned with 1 primary and 1
secondary ?

________________

thanks for your help

malte



------------snapp-----------------------------

www-1:/ha# cat /proc/drbd
version: 0.7.11 (api:77/proto:74)
SVN Revision: 1807 build by root at srv1, 2005-06-16 20:12:17
 0: cs:Connected st:Primary/Secondary ld:Consistent
    ns:43854068 nr:0 dw:720740 dr:43133477 al:617 bm:2675 lo:0 pe:0 ua:0 ap:0


www-2:/# cat /proc/drbd
version: 0.7.11 (api:77/proto:74)
SVN Revision: 1807 build by root at srv1, 2005-06-16 20:12:17
 0: cs:Connected st:Secondary/Primary ld:Consistent
    ns:0 nr:43854068 dw:43854068 dr:0 al:0 bm:2675 lo:0 pe:0 ua:0 ap:0


------------snippp---------------------

resource r0 {
 protocol C;
 startup {
 degr-wfc-timeout 480;    # 2 minutes.
  }
 disk { on-io-error   detach;  }
net {
     timeout       60;
     connect-int   10;
     ping-int      10;
 max-buffers     4096;
}
  syncer {
    rate 10M;
    group 1;
    al-extents 257;
  }
on www-1 {
    device      /dev/drbd/0;
    disk        /dev/hda3;
    address     85.XX.XX.XX:7788;
    meta-disk   internal;
  }

  on www-2 {
    device     /dev/drbd/0;
    disk       /dev/hda3;
    address    85.XX.XX.XX:7788;
    meta-disk   internal;
  }
}



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