View source for Fs-drbd

__NOTOC__
= DRBD =

== How to setup DRBD with resource and meta info on different mount point ==
* On both servers*
* Create 2 separate partitions on each server, one for meta and one for data. Some meta-disk size approximations:
 ||'''Block device size'''||'''DRBD meta data'''||
 || 1 GB || 2 MB ||
 || 100 GB || 4+1 MB ||
 || 500 GB || 16+2 MB ||
 || 1 TB || 32+2 MB ||
 || 2 TB || 64+1 MB ||
 || 4 TB || 128 MB  ||

# If the meta-disk and resource partition are listed on fstab, then remove them from there
# Install drbd
 
<pre><nowiki>
 # apt-get -y install drbd8-utils
 </nowiki></pre>


# Edit `drbd.conf` to something similar to:
 
<pre><nowiki>
 global { usage-count no; }
 common { syncer { rate 100M; } }
 resource srv {
        protocol C;
        startup {
                wfc-timeout  15;
                degr-wfc-timeout 60;
        }
        net {
                cram-hmac-alg sha1;
                shared-secret "B1ng0!";
        }
        on SERVER-01p {
                device /dev/drbd0;
                disk /dev/md4;
                address IP_SERVER-01p:7788;
                meta-disk /dev/md3[0];
        }
        on SERVER-01s {
                device /dev/drbd0;
                disk /dev/md4;
                address IP_SERVER-01s:7788;
                meta-disk /dev/md3[0];
        }
 }
 </nowiki></pre>


# Create resource and meta-disk
 
<pre><nowiki>
 # drbdadm create-md srv
 </nowiki></pre>


# Start DRBD
 
<pre><nowiki>
 # service drbd start
 </nowiki></pre>


* On primary*
When finish the previous setup on both servers
# Tell DRBD which one is the primary
 
<pre><nowiki>
 # drbdadm -- --overwrite-data-of-peer primary all
 </nowiki></pre>

 This going to take a long, depending of the size of the drive. The sync can be watched at `/proc/drbd` file.
# When drbd sync is done, then, create the filesystem on drbd device
 
<pre><nowiki>
 # mkfs.ext4 /dev/drbd0
 </nowiki></pre>

# Finally, mount drbd device on the primary server
 
<pre><nowiki>
 # mount /dev/drbd0 /srv
 </nowiki></pre>