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Cold migration or Storage vMotion unexpectedly renames virtual disks (1007862)

Last Updated: 5/3/2011Categories: Total Views: 5191Language:
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Symptoms

virtual-disk virtual-disks vmotion-vm storage-vmotion

Purpose

This article identifies an issue where a custom named virtual disk containing an underscore is unexpectedly renamed after a cold migration or a Storage vMotion.

The part of the file name after the underscore is either dropped entirely (with the underscore) or replaced with _1 if there is already a virtual disk with a name that matches the virtual machine.

Resolution

The part of the file name from the underscore (including the underscore) up to the .vmdk is removed. If the filename exists, the _XXX is changed to _1 or whatever is the next available number.

This issue is cosmetic only and does not have an impact on the virtual machine. It will continue to function normally.

For example, if the virtual machine contains two virtual disks named as follows:

-rw------- 1 root root 104857600 Nov 24 13:29 test_DATA-flat.vmdk
-rw------- 1 root root 350 Nov 24 13:39 test_DATA.vmdk
-rw------- 1 root root 12884901888 Nov 24 13:29 test_OS-flat.vmdk
-rw------- 1 root root 413 Nov 24 13:38 test_OS.vmdk

In this example, if the datastore becomes low on space, and you move the _DATA drive to another datastore, after cold migration, the file names are:

Renamed from:

To:

-rw------- 1 root root 104857600 Nov 24 13:45 test-flat.vmdk
-rw------- 1 root root 345 Nov 24 13:45 test.vmdk

Notice that the _DATA disk is renamed to test.vmdk , which is the base virtual machine name.

If you migrate OS disk to the same volume as the _DATA disk, the filenames become:

-rw------- 1 root root 12884901888 Nov 24 14:06 test_1-flat.vmdk
-rw------- 1 root root 412 Nov 24 14:06 test_1.vmdk
-rw------- 1 root root 104857600 Nov 24 13:47 test-flat.vmdk
-rw------- 1 root root 345 Nov 24 13:47 test.vmdk

At this point, the _OS disk now ends with _1 and the _DATA disk is the base file name (test.vmdk ).

There is no workaround. Avoid the use of the underscore character in custom virtual disk names. The hyphen (-) is a known safe character.

Detectable by VMware SkylineTM

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End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

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