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 from one client 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 space from one virtual disk for satisfying allocation needs of some other virtual disk within the same data store.
System requirements
Thin provisioned (TP) SCSI disk
Space can be reclaimed on SCSI disks that advertise themselves as thin provisioned (TP) devices.
GuestReclaim queries the device for its TP status using standard SCSI primitives like reading the vital product data page (B0 vpd). GuestReclaim will issue SCSI Unmap commands to the underlying storage for reclaiming dead space.
Supported Operating Systems
- Desktop: XP onwards up to Windows 7
- Server: Until Windows 2008
Administrative Privileges
The tool needs to be executed with Administrator privileges.
The tool needs to be executed with Administrator privileges.
Supported Filesystem NTFS only.
Download link
http://labs.vmware.com/flings/guest-reclaim
Instructions
The tool is provided as a standalone binary executable. Unzip the package, and it will contain a program. The tool needs to be executed with Administrator privileges.
Run
GuestReclaim.exe
from the command prompt. Use the --list
option to list available thin provisioned disks on the system. If none show up, it means that the first 16 drives are not thin provisioned. Export an environment variableRECLAIM_DEBUG
to see verbose output of the TP querying results.