DRBD失败：(127)设备小未分配

Question

我使用wmware工作站运行两个虚拟机，其中OpenVZ 2.6.32-042stab108.2安装在CentOS 6.6上。我创建了另一个主分区/dev/sda4，将其配置为drbd资源。我还在上面创建了一个文件系统。第二台计算机实际上是使用第一台虚拟磁盘创建的，主机名和eth0 ip地址都已更改。drbd配置文件如下：

global { usage-count no; } 
common { syncer { rate 100M; } } 
resource r0 { 
        protocol C; 
        startup { 
                wfc-timeout  15; 
                degr-wfc-timeout 60; 
        } 
        net { 
                cram-hmac-alg sha1; 
                shared-secret "password"; 
        } 
        on primary { 
                device /dev/drbd0; 
                disk /dev/sda4; 
                address 192.168.18.10:7788; 
                meta-disk internal; 
        } 
        on secondary { 
                device /dev/drbd0; 
                disk /dev/sda4; 
                address 192.168.18.20:7788; 
                meta-disk internal; 
        } 
}

在使用drbdadm md r0创建资源之后，当我输入服务drbdadm时，我得到：

Failure: (127) Device minor not allocated.

drbdadm dump all的输出可能会有帮助：

[root@primary ~]# drbdadm dump all
# /etc/drbd.conf
# resource r0 on primary: not ignored, not stacked
resource r0 {
    protocol               C;
    on primary {
        device           /dev/drbd0 minor 0;
        disk             /dev/sda4;
        address          ipv4 192.168.18.10:7788;
        meta-disk        internal;
    }
    on secondary {
        device           /dev/drbd0 minor 0;
        disk             /dev/sda4;
        address          ipv4 192.168.18.20:7788;
        meta-disk        internal;
    }
    net {
        cram-hmac-alg    sha1;
        shared-secret    danuts;
    }
    startup {
        wfc-timeout       15;
        degr-wfc-timeout  60;
    }
}

是什么导致了这个错误，如何减轻它？谢谢!

Answer 1

我只是犯了同样的错误，第二个节点的IP地址似乎无法到达。首先，我检查了服务状态：

systemctl status drbd.service
â drbd.service - DRBD -- please disable. Unless you are NOT using a cluster manager.
   Loaded: loaded (/usr/lib/systemd/system/drbd.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since mar. 2018-04-10 16:21:49 CEST; 5s ago
  Process: 3347 ExecStart=/lib/drbd/drbd start (code=exited, status=20)
 Main PID: 3347 (code=exited, status=20)

avril 10 16:21:49 GROESSLTCL0B systemd[1]: Starting DRBD -- please disable. Unless you are NOT using a cluster manager....
avril 10 16:21:49 GROESSLTCL0B drbd[3347]: Starting DRBD resources: drbd.d/r0.res:20: in resource r0, on GROESSLTCL0B:
avril 10 16:21:49 GROESSLTCL0B drbd[3347]: IP 192.168.254.2 not found on this host.
avril 10 16:21:49 GROESSLTCL0B systemd[1]: drbd.service: main process exited, code=exited, status=20/n/a
avril 10 16:21:49 GROESSLTCL0B systemd[1]: Failed to start DRBD -- please disable. Unless you are NOT using a cluster manager..
avril 10 16:21:49 GROESSLTCL0B systemd[1]: Unit drbd.service entered failed state.
avril 10 16:21:49 GROESSLTCL0B systemd[1]: drbd.service failed.

因此，我将第二个节点的IP固定在r0.res中，新内容如下：

resource r0 {
     protocol "C";

  net {
    allow-two-primaries;
    after-sb-0pri discard-zero-changes;
    after-sb-1pri discard-secondary;
    after-sb-2pri disconnect;
  }
  on GROESSLTCL0A {
    device /dev/drbd0;
    disk /dev/sdb;
    address 163.104.8.108:7789;
    meta-disk internal;
   }

  on GROESSLTCL0B {
    device /dev/drbd0;
    disk /dev/sdb;
    address 163.104.8.107:7789;
    meta-disk internal;
  }

}

然后我重新创建了资源：

drbdadm create-md r0

在此之后，我重新启动了drbd服务，并且一切都如愿以偿。