A physical disk resource may fail to come online, or the
Cluster service may fail to start. The following message is generated in the
system event log:
Event ID: 1034
Description: The disk associated with cluster disk resource
DriveLetter could not be found. The expected
signature of the disk was DiskSignature.
These issues typically occur if either of the following
conditions is true:
- A disk has become unavailable or inaccessible, and
therefore, the Cluster service cannot find it.
- The signature on the disk has been changed.
The Cluster service recognizes and identifies disks by their
disk signatures. Disk signatures are stored on the physical disk in the master
boot record (MBR). The MBR is a record that the Cluster service keeps of all
the disks that it manages. It uses the MBR to track the disks. During the
course of Cluster service operations (start, restart, failover, and so forth),
if the Cluster service cannot find a disk that is identified by a particular
signature, it will fail to bring the disk online. The cluster component that
specifically detects this condition and logs the error is the cluster disk
filter driver (Clusdisk.sys). The error message provides information on the
"missing disk" but does not indicate the reasons that this condition may have
To resolve this problem, follow these steps:
- Make sure that the disk is actually exposed through the
shared interconnects and is visible to the operating system. To do this:
If the count does not
match, the disk is not accessible to that node. Troubleshoot your storage
solution to make sure that the disk is accessible and can be mounted by the
operating system. When the storage solution is functioning correctly, you can
rescan the bus by right-clicking the Device Manager disks.
Start, click Run, type
CompMgmt.msc, and then click OK.
Computer Management under System Tools, Device
Manager, look under Disk Drives, and you can view all the logical disks that are being presented
to the node.
All nodes in a cluster can see the same number of disk drives for
disks that are managed by the cluster. For example, if there are 10 disks that
are managed by the cluster, all 10 are visible to all nodes in the cluster. If
you know the Target ID and LUN of the disk, you can validate them by clicking
Properties for each disk.
count does match, and if the Cluster service is up and running, reduce the
complexity, if possible, by moving the all the disk resources (groups that host
the resources) to a single node. If the Custer service has failed, shut down
all nodes and restart one node.
- If the
disk signatures have changed, use Dumpcfg.exe to write the expected signature
back to the disk.
The signatures of the disks as enumerated by dumpcfg should match the list that is derived from the following registry
HKLM/System/CurrentControlSet/Services/Clusdisk/ParametersClusdisk uses this information to bind to disks that are managed
by the Cluster service.
- If the signatures in the list do not match
the registry subkey list, you must correctly identify the disks that have had
their signatures changed and reset them to the expected signatures. To do this:
- Power down all but one node.
- Document the disk number:
Compare the information that is displayed with the
message in the "Description" section of the Event ID 1034.
- Open Computer Management, double-click Storage, and then click Disk Management.
- In Logical Disk Manager, note the disk number and
label that is associated with the failing disk. This information is to the left
of the partition information. For example: Disk 0.
"The disk associated with cluster disk resource 'Disk Q:\'". The disk label
should not change even if the signature has. The disk label will help you
correctly identify the problem disk. Once the disk has been correctly
identified its signature can be checked again to validate the mismatch.
- If you cannot see the disks in DiskMgmt.msc, set the
Cluster service and Cluster Disk device to Manual, and then restart the node
(all other nodes should remain shut down). To do this, follow these steps.
NOTE: This step may not be necessary.
- Click Start, point to
Programs, point to Administrative Tools, and
then click Computer Management.
- Click Device Manager in the left
pane, and then click Show Hidden Devices on the
- In the right pane, view the non-Plug and Play
drives section, and then double-click the Clusdisk
- On the Driver tab, change the
Startup type option from System to
- In the left pane, double-click "Services and
Applications", and then click "Services".
- In the right pane, double-click the
Cluster service, and then click Disabled in
the Startup type box.
- Restart the node, and then repeat step 2 if
- Write the signature that the Cluster service expects to
- Obtain the expected signature from the
"Description" section of the Event ID 1034 error message. For example: "The
expected signature of the disk was 12345678."
- Copy DumpCfg.exe from the Windows 2000 Resource Kit
to the local node. At the command prompt, type
dumpcfg.exe. Under the [DISKS] section, the disk number and signature for all available disks is
displayed. Validate the actual disk signature with what the Cluster service
- Write the expected signature to the disk by using
by using the following command, where 12345678
is the disk signature in hexadecimal, and 0 is the disk number that
you replaced (which was obtained from the previous step):
dumpcfg.exe -s 12345678 0For more information about using Dumpcfg.exe, type
dumpcfg /? at the command prompt.
- Set the Cluster service back to Automatic, and set the Cluster Disk device back to System on the node. Start the Cluster Disk device, and then start the
- Open Cluster Administrator, and then bring the disk
- Turn on all other nodes, one at a time, and then test
If you are having problems bringing disks online on a
Windows NT 4.0 cluster, click the following article number to view the article
in the Microsoft Knowledge Base:
Event ID 1034 for MSCS Shared Disk After Disk Replacement
Malfunctioning multi-path software is a
common cause for disk signatures to change.
For more information about malfunctioning multi-path software in Windows 2000 clusters, please contact Microsoft support to obtain the hotfix that is described in the following Microsoft Knowledge Base article:
Multiple-path software may cause disk signature to change