26-1: Defining a Partnership in DRBD in .NET

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Listing 26-1: Defining a Partnership in DRBD
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resource drbd0 { net { sync-max = 30M } protocol = C fsckcmd = /bin/true # DB Server on node1 { device = disk = address = port = }
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/dev/nb0 /dev/sdb1 192.168.0.2 7788
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# DR DB Server on node2 { device = /dev/nb0 disk = /dev/sda8 address = 192.168.0.3 port = 7788 } }
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We have defined two machines, node1 and node2; node1 is the primary node in the partnership (the first node defined). As synchronization takes place over the network, it is a good idea to specify how much bandwidth can be used when sending data between machines. If you have to share your network bandwidth with other applications which is usually true over a wide area network (WAN) link to a DR site you do not want to saturate your connection at the sake of one DR configuration. The net section allows you to configure any network-based operations that DRBD will use during synchronization. For example, here we have defined a maximum synchronization rate of 30 megabytes per second (Mbps) so as not to saturate our 100 Mbps link.
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A very important aspect of DRBD is the protocol used for synchronization. DRBD defines three protocols that can be used. They are listed in Table 26-1.
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Table 26-1: DRBD Protocol Versions
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Protocol Version A B Description Data is marked as written when it has been written to the local disk and the network buffer. Data is marked as written when it has been written to the local disk and an acknowledgement has been received from the secondary node s network buffer. Data is marked as written when it has been written to the local disk and an acknowledgement has been received when data has been written to the remote disk.
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Each protocol version provides a different profile for writing data depending on your network and disk latency and also whether you need to guarantee your data has been saved to the remote disk or not. If you are using a high latency connection, you may need to use protocol A. This effectively removes any issues you have with the network as the kernel returns a write operation as soon as it has been written to the local disk and sent to the network buffer. This is the fastest protocol you can use if your application needs near local write efficiency. If you are using a low latency network, protocol C guarantees data has been written to both machines disks before a write is returned by the kernel. If you notice that your disk writes are taking too long when using this protocol, you may want a mid point between protocol A and C. Protocol B returns a write only when data has been written to the local disk and has been received by the remote network buffer. This decreases the amount of time it takes for local writes but also gives you some guarantee that your network is on the way to being written to the remote disk. Choosing the best protocol is something that you must be comfortable with because it severely impacts the speed of local writes to the disk, thus slowing down the application that relies on the data being replicated. As we are more concerned with the integrity of the data and not the speed of the transfer, we have chosen protocol C.
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Defining your hosts
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When your network and protocol have been defined, you need to specify the hosts that will be taking part in the replication. In Listing 26-1, we have defined node1 first, telling DRBD that this is the primary node. You need to define the IP address of the node, the raw device to replicate, and the name of the device as it will be used by the node itself.
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