IBM System storage DS6000 Series, Attachment Manual

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Remote Mirror and Copy read from secondary option is not
supported
“Read from secondary” allows a target volume to be opened in read-only mode
during a Remote Mirror and Copy operation. VMware ESX Server does not open
volumes in read-only mode and therefore is not able to access a Remote Mirror and
Copy target while a copy is in progress.
Rescan of LUNS might be required
VMFS is able to manage (without any “umount”) changes on a hard drive at the file
system level. It can manage a copy as long as the system knows that there is a
VMFS file system to look for:
v
If the copy target volume was discovered at boot time without a VMFS file
system on it, you must perform a rescan operation for the changes.
v If it knowns that there is a VMFS file system, the server can use the new
information immediately without any intervention.
Chapter 12. Attaching to an Intel host running VMware ESX server
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