Drbd-utils - ArchWiki

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# Drbd-utils

From ArchWiki

****************WORK IN PROGRESS****************

DRBD is a method that replicates a block device between 2 machines by intercepting the i/o's at the kernel level and sending them to the remote machine

## Installation

Install the drbd-utilsAUR package

## Backing Device Configuration

### Block Device (part/md/disk)

//todo

### Loop Device (file)

    # mkdir /havol
    # fallocate -l10G test.img
    # losetup /dev/loop100 /havol/test.img

## DRBD Global Config

Append to the bottom of the common section

    /etc/drbd.d/global_common.conf

    syncer {
        rate 4194304k; # For a 1G network use 500 megabit
        al-extents 6433;
    }

## DRBD Resource Config

Create the DRBD resource Config I would recomend to keep the numbering of the DRBD device, loop device and port consistent to make tracking easy e.g. `/dev/loop100 /dev/drbd100 port 7100`

Edit `/etc/drbd.d/test.res`

with the following:

    resource test {
       protocol C;
       startup { wfc-timeout 0; degr-wfc-timeout 120; }
       disk {
           on-io-error detach;
           c-fill-target 10M;
           c-max-rate 4G; #On a 1G link use 300M
           c-plan-ahead 7;
           c-min-rate 4M;
       }
       net { cram-hmac-alg "sha1"; shared-secret "ReplaceMeWithARandomStringAbout32Char"; }
       on Node1 {
           device /dev/drbd100;
               disk /dev/loop100;
               meta-disk internal;
               address 169.254.32.1:7100;
       }
       on Node2 {
           device /dev/drbd100;
           disk /dev/loop100;
           meta-disk internal;
           address 169.254.32.2:7100;
       }
    }

Category:

- Storage