Guest Reclaim reclaims dead space from NTFS volumes hosted on a thin provisioned SCSI disk. The tool can also reclaim space from full disks and partitions, thereby wiping off the file systems on it. As the tool deals with active data, please take all precautionary measures understanding the SCSI UNMAP framework and backing up important data.
Features
* Reclaim space from Simple FAT/NTFS volumes
* Works on WindowsXP to Windows7
* Can reclaim space from flat partitions and flat disks
* Can work in virtual as well as physical machines
What is Dead Space Reclamation ?
Deleting files frees up space on the file system volume. This freed space sticks with the LUN/Disk, until it is released and reclaimed by the underlying storage layer. Free space reclamation allows the lower level storage layer (for example a storage array, or any hypervisor) to repurpose the freed space for some other storage allocation request.
For example:
* A storage array that supports thin provisioning can repurpose the reclaimed space to satisfy allocation requests for some other thin provisioned LUN within the same array.
* A hypervisor file system can repurpose the reclaimed freed space from one virtual disk for satisfyingallocation needs of some other virtual disk within the same data store.
* GuestReclaim allows transparent reclamation of dead space from NTFS volumes.
http://labs.vmware.com/flings/guest-reclaim
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