I have 1 node which has dual boot windows XP & centos.(First it has only xp then i add centos with help of GPARTED).
2nd node completely centos.
On both nodes i try to use java project which create some data & stored in tables which created by mysql.
Both nodes should synchronize so i use DRBD- Heartbeat so database should store in shared disk & any node can handle it.
As DRBD -Heartbeat use for when one node fails then another should up & take responsibility,java project also work on same theme.
When i try to check whether my concept actually working or not...
I face few problems.
node 1 has centos on LVM, hdc2 & 3 & hdc4 for DRBD partition.
Node 2 has all partition as sda(partition no).
Question. For DRBD Heartbeat it necessary to both node have same partitioning pattern?(node 1 has 1 primary partitions which contain XP, on logical partition there are 3 partitions 2 for centos & 3rd for DRBD, node 2 has all partitions as primary.) Or as i ask in serverfault i try to run mysql from shared disk so each time i have to enter following command on primary node.
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The partitioning doesn't matter, but the partition sizes do, since what drbd actually replicates is partitions or their logical equivalents (LVM logical volumes). The secondary has to have a container of the same size as the primary for each drbd resource being replicated.
It's worth noting that the secondary does not have an accessible filesystem. Until it becomes a primary, it's basically just a place where bytes get dumped. Only a primary can be mounted as a filesystem. If you need actual mirrored cross-system access, look at something like GFS, instead.
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Thanks Tim Holloway,
Your information helpful for me.
GFS You are trying to telling me Global file system or Google File System?
By this word i got confuse...Currently i use Ext3, which is the default file system for many popular Linux distributions!
For using GFS should i change in java project?