The Map Disk Region task appears repeatedly in vCenter Server after using VMware Consolidated Backup

Products

• VMware vCenter Server
• VMware vSphere ESXi

Issue/Introduction

Symptoms:

• If you use VMware Consolidated Backup (VCB) to perform a backup, the Map Disk Region task appears repeatedly in vCenter Server.
• A virtual disk created on the command line as type thin may experience this issue.
• If you use any third party backup software to perform a backup, the Map Disk Region task appears repeatedly in vCenter Server.

Environment

VMware vCenter Server 5.0.x
VMware Consolidated Backup 1.1.x
VMware VirtualCenter 2.5.x
VMware VirtualCenter 2.0.x
VMware vCenter Server 4.0.x
VMware Consolidated Backup 1.5.x
VMware Consolidated Backup 1.0.x
VMware vCenter Server 4.1.x

Cause

VCB needs to acquire a lease for the file or files associated with the virtual disks of a virtual machine. Normally, the lease block information contains the mapping for the region requested. If the disk is severely fragmented, only a portion of the actual mapping may be returned and additional mapping requests are needed.

If a virtual machine has a previous snapshot, the disk might also be considerably fragmented. The mapping information might not span the entire disk and additional mapping requests are again required.

When vCenter Server notices fragmentation, it logs a Map Disk Region task.

Resolution

The messages are informational and do not indicate a problem.

If the virtual machine has snapshots, commit them. For more information, see Committing snapshots from within the Service Console (1006847).

Note: You may have to shut down the third party back up application/software and then commit the snapshot.

Additional Information

使用 VMware Consolidated Backup 之后，“映射磁盘区域”任务会在 vCenter Server 中重复出现
VMware Consolidated Backup を使用すると vCenter Server にディスク領域のマップ タスクが繰り返し表示される
A tarefa Map Disk Region aparece repetidamente no vCenter Server após a utilização do VMware Consolidated Backup