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Section 2.8: Establish the SC 3.0 Quorum Device - First Cluster Node Only

Step 2.8.1

On each cluster node, use the scdidadm command to verify the correct subsystem configuration has been established. Identify the DID number for the first shared disk which will be assigned as the quorum disk. The quorum devie will be physically located within shared storage. In our example, this should be d4 and should correspond to /dev/rdsk/c1t0d0 on each cluster node. To verify this, as root, enter:

# scdidadm -L 


Starting at Line 4 of the scdidadm -L output, notice the DIDs are displayed twice, once for each cluster node connection. Both nodes must share a connection to a quorum device, and is required for this two-node cluster. Verify that both nodes connect to the same physical device (for example, /dev/rdsk/c1t0d0) and have the same DID assignment (for example /dev/did/rdsk/d4). The DID assignments for all global devices should follow this example, and be identical on both cluster nodes.

Verify the following output, noting that lines 4 and 5 refer to the same physical disk or spindle:

1 clustnode1:/dev/rdsk/c0t0d0 /dev/did/rdsk/d1   
2 clustnode1:/dev/rdsk/c0t1d0 /dev/did/rdsk/d2   
3 clustnode1:/dev/rdsk/c0t6d0 /dev/did/rdsk/d3   
4 clustnode1:/dev/rdsk/c1t0d0 /dev/did/rdsk/d4   
4 clustnode2:/dev/rdsk/c1t0d0 /dev/did/rdsk/d4   
5 clustnode1:/dev/rdsk/c1t1d0 /dev/did/rdsk/d5   
5 clustnode2:/dev/rdsk/c1t1d0 /dev/did/rdsk/d5   
6 clustnode1:/dev/rdsk/c1t2d0 /dev/did/rdsk/d6   
6 clustnode2:/dev/rdsk/c1t2d0 /dev/did/rdsk/d6   
7 clustnode1:/dev/rdsk/c1t8d0 /dev/did/rdsk/d7   
7 clustnode2:/dev/rdsk/c1t8d0 /dev/did/rdsk/d7   
8 clustnode1:/dev/rdsk/c1t9d0 /dev/did/rdsk/d8   
8 clustnode2:/dev/rdsk/c1t9d0 /dev/did/rdsk/d8   
9 clustnode1:/dev/rdsk/c1t10d0 /dev/did/rdsk/d9   
9 clustnode2:/dev/rdsk/c1t10d0 /dev/did/rdsk/d9   
10 clustnode1:/dev/rdsk/c2t0d0 /dev/did/rdsk/d10  
10 clustnode2:/dev/rdsk/c2t0d0 /dev/did/rdsk/d10 
11 clustnode1:/dev/rdsk/c2t1d0 /dev/did/rdsk/d11  
11 clustnode2:/dev/rdsk/c2t1d0 /dev/did/rdsk/d11  
12 clustnode1:/dev/rdsk/c2t2d0 /dev/did/rdsk/d12  
12 clustnode2:/dev/rdsk/c2t2d0 /dev/did/rdsk/d12  
13 clustnode1:/dev/rdsk/c2t8d0 /dev/did/rdsk/d13  
13 clustnode2:/dev/rdsk/c2t8d0 /dev/did/rdsk/d13  
14 clustnode1:/dev/rdsk/c2t9d0 /dev/did/rdsk/d14  
14 clustnode2:/dev/rdsk/c2t9d0 /dev/did/rdsk/d14  
15 clustnode1:/dev/rdsk/c2t10d0 /dev/did/rdsk/d15  
15 clustnode2:/dev/rdsk/c2t10d0 /dev/did/rdsk/d15  
16 clustnode2:/dev/rdsk/c0t0d0 /dev/did/rdsk/d16  
17 clustnode2:/dev/rdsk/c0t1d0 /dev/did/rdsk/d17  
18 clustnode2:/dev/rdsk/c0t6d0 /dev/did/rdsk/d18 


Verify local disk and CD-ROM devices are reported correctly in the output (for example, d1, d2 and d3 represent internal clustnode1 devices, while d16, d17, and d18 represent internal clustnode2 devices).

Key Practice: Label devices and cables. Devices and cables that are easily identified make troubleshooting and maintenance easier. This is helpful even for systems that do not require high availability. Where high availability is a prerequisite, cable and device identification and labelling should be high priority. Verify disks (boot devices, mirrors, disk quorums, volume manager conifiguration databases, clones, hot-spares, and so on), CD-ROM drives, tape drives, and cable labels are correct. This enables service operations to easily correlate error messages, which may specify global DID numbers, metadevice names, or controller number and sd/ssd instances. Proper labelling can help when interpreting errors and to determine specific failed devices such as specific disk spindles and related components. Tape drives should be labelled with their rmt instance numbers.

Step 2.8.2

Prepare to establish a quorum device using d4 as the quorum disk. Enter the following command and answer each prompt as indicated, on the first cluster node only:

root@clustnode1# scsetup
>>>> Initial Cluster Setup <<<<
{. . . . . output omitted. . . . . }
Is it okay to continue? yes
Do you want to add any quorum disks? yes
. . . {{output omitted}} . . .
Which global device do you want to use (d<N>)? d4
Is it okay to proceed with the update? yes

Observe cluster node console messages indicating cluster reconfiguration (reconfiguration #4) has completed.

Step 2.8.3

On the first cluster node press Enter when prompted.

Then, scsetup will prompt to add additional quorum disks. Enter no, as indicated:

{. . . . output omitted . . . }
Do you want to add another quorum disk (yes/no)? no

Step 2.8.4

Finally, reset the cluster "install mode," as indicated on the first cluster node:

{. . . . output omitted . . . }
Is it okay to reset install mode? yes

Step 2.8.5

Verify the cluster initialization completes and that each cluster node reports console messages and cluster events, as they occur.

On the first cluster node, press Enter when prompted, to proceed to the main menu. Next, enter q to quit scsetup.


Verify the cluster advances from the "install mode" state to operational status. Observe the scconf -p output, and verify that the install mode is 'disabled'.

Step 2.8.6

Verify that the quorum device has been configured correctly as indicated by the command, scstat:

# scstat

-- Cluster Nodes --

          Node name      Status
          ---------      ------
 Cluster node:   clustnode1     Online
 Cluster node:   clustnode2     Online

-- Cluster Transport Paths --

          Endpoint      Endpoint      Status
          --------      --------      ------
 Transport path:  clustnode1:qfe4   clustnode2:qfe4   Path online
 Transport path:  clustnode1:qfe0   clustnode2:qfe0   Path online

-- Quorum Summary --

 Quorum votes possible:   3
 Quorum votes needed:    2
 Quorum votes present:    3

-- Quorum Votes by Node --

          Node Name      Present Possible Status
          ---------      ------- -------- ------
 Node votes:    clustnode1     1    1    Online
 Node votes:    clustnode2     1    1    Online

-- Quorum Votes by Device --

          Device Name     Present Possible Status
          -----------     ------- -------- ------
 Device votes:   /dev/did/rdsk/d4s2 1    1    Online

{ . . . output omitted . . . }

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