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VMKFSTOOLS                 VMware ESX Server Manual                 VMKFSTOOLS

     vmkfstools - VMware ESX Server file system management tool

     vmkfstools OPTIONS
     vmkfstools OPTIONS PARTITION
     vmkfstools OPTIONS DEVICE
     vmkfstools OPTIONS PATH

     VMware ESX Server is Copyright 2000-2006 VMware, Inc. All rights

     vmkfstools is a program for creating and manipulating virtual disks, file
     systems, logical volumes and physical storage devices on the VMware ESX
     Server. It supports the creation of a VMware ESX Server File System
     (VMFS) on a partition of a disk, and the management of files (such as
     virtual disks) stored on VMFS.

     OPTIONS is one or more command-line options that specify the operation.
     The file or VMFS file system being manipulated may be specified after the
     options by a relative or absolute file path name in the /vmfs hierarchy.

     The PARTITION argument is used for specifying partitions, and should be
     of the form vmhbaA:T:L:P where A, T, L and P are integers representing
     adapter, target, LUN and partition respectively. The partition digit must
     be greater than zero.  For example, vmhba0:2:3:1 refers to the first par-
     tition on LUN 3, target 2, HBA 0.

     The DEVICE argument is used for specifying devices, and should be a path
     name beginning with /vmfs/devices, which is the mount point of the device
     file system. There are sub-mounts for each device class. For example,
     /vmfs/devices/disks for local or SAN-based disks, /vmfs/devices/lvm for
     VMKernel logical volumes, /vmfs/devices/generic for generic SCSI devices
     like tape drives, etc.

     The PATH argument is used for specifying a VMFS file system or file, and
     should be an absolute or relative path that names a directory or a file
     under /vmfs.  For example, a VMFS file system could be specified via a
     path such as:

     /vmfs/volumes/<file_system_UUID> or /vmfs/volumes/<file_system_label>

     A VMFS file would be specified via a path such as:

     /vmfs/volumes/<file_system_label|file_system_UUID>/[dir]/myDisk.vmdk or

     if the current working directory is the parent directory of myDisk.vmdk.

     The long and short forms of options, shown here listed together, are

     -C, --createfs vmfs3
     -b, --blocksize #[mMkK]
     -S, --setfsname fsName
         Create a VMFS file system on the specified partition,
         e.g. vmhba1:0:0:1. The partition becomes the file systemâs head
         partition. The file block size can be specified via the ´-b´
         option. The default file block size is 1MB. The file block size
         must be either 1MB, 2MB, 4MB or 8MB. In ESX Server 3, VMFS-2 file
         systems are read-only in that users will not be allowed to create
         or modify them. VMFS-3 file systems will not be accessible from
         ESX 2.x hosts.

         The -S option sets the label of the VMFS file system, and can only
         be used in conjunction with the ´-C´ option. This label can then
         be used to specify a VMFS file system in subsequent vmkfstools
         commands or in a virtual machine configuration file. The label
         will also appear in a listing produced by ´ls -l /vmfs/volumes´
         as a symbolic link to the VMFS file system. VMFS labels can be up
         to 128 characters long. They cannot contain leading or trailing
         spaces. After creating the file system, the label can be changed
         using the command ´ln -sf /vmfs/volumes/<FS UUID>
         /vmfs/volumes/<New label>´.

     -Z, --extendfs extension-partition
         Extend an existing VMFS-3 file system with the specified head
         partition by adding another partition designated by
         ´extension-partition´. A VMFS-3 file system can have at most 32
         partitions. This option will not work on VMFS-2 file systems as
         they are read-only in ESX Server 3.

     -P, --queryfs
     -h, --human-readable
         List the attributes of a VMFS file system when used on any file or
         directory of a VMFS file system. It lists the VMFS version number,
         the number of partitions constituting the specified VMFS file
         system, the file system label (if any), file system UUID,
         available space, and a listing of the device names of all the
         partitions constituting the file system. If partitions backing
         VMFS file system go offline then the number of partitions and
         available space reported change accordingly. The ´h´ option
         causes sizes to be printed in human-readable format (such as 5k,
         12.1M, or 2.1G).

     VMFS-2 to VMFS-3 file system upgrade is a two step process. Before file
     system upgrade can begin the `vmfs2` and `vmfs3` drivers must be unloaded
     and the auxiliary file system driver, `fsaux`, should be loaded. The
     first step of upgrade uses the `-T` option. Once the first step com-
     pletes, the auxiliary file system driver, `fsaux`, must be unloaded and
     the `vmfs2` and `vmfs3` drivers reloaded. The second step of file system
     upgrade makes use of the `-u` option.

     -T, --tovmfs3
     -x, --upgradetype [zeroedthick|eagerzeroedthick|thin]
         Converts a VMFS-2 file system to VMFS-3 format, preserving all files
         on the file system. Only file systems with block size 8MB or less
         can be converted. The conversion is in-place and the auxiliary file
         system driver (`fsaux`) module must be loaded. ESX Server will
         try to ensure that no local process or remote ESX Server is currently
         accessing the VMFS file system to be converted. The conversion is a
         one-way operation and once the VMFS-2 file system is converted to
         VMFS-3 file system, it cannot be rolled back to VMFS-2. The `-x
         thin` option results in the conversion of VMFS-2 files into
         thin-provisioned VMFS-3 files (as opposed to thick-provisioned
         files). File blocks that are part of a ´thick´ file, but were
         never written to, are discarded from the file to enable storage
         overcommitment.  The default upgrade option, `-x zeroedthick`,
         retains the properties of ´thick´ files across the upgrade.
         The `-x eagerzeroedthick` option eagerly zeroes out previously
         unwritten blocks. Note that the upgrade process may run much longer
         when invoked with the `-x eagerzeroedthick` option, as opposed
         to the other two options.

     -u, --upgradefinish /vmfs/volumes/<file system label|file system UUID>
         Once the first step of file system upgrade has completed (using
         `-T`), the `vmfs2` and `vmfs3` modules must be reloaded and
         the `-u` option used to complete the upgrade.

     -c, --createvirtualdisk #[gGmMkK]
     -a, --adaptertype [buslogic|lsilogic] srcFile
     -d, --diskformat [zeroedthick|eagerzeroedthick|thick|thin]
         Create a virtual disk with the specified size on the VMFS file
         system. The size is specified in bytes by default, but can be
         specified in kilobytes, megabytes or gigabytes by adding a suffix
         of ´k´, ´m´, or ´g´ respectively. The ´adaptertype´ option
         allows users to indicate which device driver should be used to
         communicate with the virtual disk. See the `SUPPORTED DISK
         FORMATS` section for details on the disk formats supported by
         the ´-d´ option. The default disk format is ´zeroedthick´. The
         `-d eagerzeroedthick` option is used to create `thick` virtual
         disk with zeroed out contents.

     -U, --deletevirtualdisk
         Delete files associated with the specified virtual disk.

     -E, --renamevirtualdisk srcDisk
         Rename files associated with a specified virtual disk to the
         specified name.

     -i, --clonevirtualdisk srcDisk
     -d, --diskformat [rdm:<device>|rdmp:<device>|raw:<device>|thin|2gbsparse]
         Create a copy of a virtual disk or raw disk. The copy will be in
         the specified disk format. See the `SUPPORTED DISK FORMATS´
         section for details on the disk formats supported by the ´-d´
         option. To clone ESX REDO logs while preserving their hierarchy, use
         the Service Console command ´cp(1)´.

     -e, --exportvirtualdisk dstDisk
         This operation is deprecated. Use ´-i srcDisk -d 2gbsparse´ to
         achieve what it used to.

     -X, --extendvirtualdisk #[gGmMkK]
         Extend the specified VMFS virtual disk to the specified length. This
         command is useful for extending the size of a virtual disk
         allocated to a virtual machine after the virtual machine has been
         created. However, this command requires that the guest operating
         system has some capability for recognizing the new size of the
         virtual disk and taking advantage of this new size (e.g. by
         updating the file system on the virtual disk to take advantage of
         the extra space).

     -M, --migratevirtualdisk
         Migrate an ESX2 virtual disk to an ESX3 virtual disk.

     -r, --createrdm /vmfs/devices/disks/...
         Map a raw disk to a file on a VMFS file system. Once the mapping
         is established, it can be used to access the raw disk like a
         normal VMFS virtual disk. The ´file length´ of the mapping is
         the same as the size of the raw disk that it points to.

     -q, --queryrdm
         List the attributes of a raw disk mapping. When used with a
         ´rdm:<device>´ or ´raw:<device>´ specification, it prints out the
         vmhba name of the raw disk corresponding to the mapping
         referenced by the <device>. It also prints out identification
         information for the raw disk (if any).

     -z, --createrdmpassthru /vmfs/devices/disks/...
         Map a passthrough raw disk to a file on a VMFS file system. This
         allows a virtual machine to bypass the VMKernel SCSI command
         filtering layer done for VMFS virtual disks. Once the mapping is
         established, it can be used to access the passthrough raw disk
         like a normal VMFS virtual disk.

     -Q, --createrawdevice /vmfs/devices/generic/...
         Create a raw device descriptor file on a VMFS file system. This
         should only be used for generic SCSI devices like tape drives.

     -v, --verbose #
         This option is ignored for the queryrdm option. Setting the
        verbosity level will list additional information for the virtual disk

     -g, --geometry
         Get the geometry information (cylinders, heads, sectors) of a
         virtual disk.

     -w, --writezeros
         Initialize the virtual disk with zeros. Any existing data on virtual
         disk is lost.

     -j, --inflatedisk
         Convert a `thin` virtual disk to `thick` with the additional
         guarantee that any data on `thin` disk is preserved and any blocks
         that were not allocated get allocated and zeroed out.

     These are the arguments that can be passed to the ´-d´ option for the
     ´-c´ (create virtual disk) and ´-i´ (clone virtual disk) operations.

         This is the default option when creating new virtual disks.
         A zeroed thick disk has all space allocated at creation
         time, and this space is wiped clean of any previous contents on the
         physical media.

         An eager zeroed thick disk has all space allocated and zeroed out at
         creation time. Such disks may take longer time during creation
         compared to other disk formats.

         A thick disk has all space allocated at creation time. This
         space may contain stale data as it exists on the physical media.

         Space required for thin-provisioned virtual disk is allocated and
         zeroed on demand as opposed to upon creation.

         Virtual compatibility mode raw disk mapping.

         Physical compatibility mode (pass-through) raw disk mapping.

         Raw device.

         A sparse disk with 2GB maximum extent size. Disks in this format
         can be used with other VMware products.

     -s, --scan adapterName
         Scan a specified adapter for devices and/or LUNs. This option is
         especially useful for adapters which are connected to storage area
         networks (SANs). If a new device or LUN becomes accessible via the
         adapter, ESX Server will register this new device or LUN and
         make it usable by virtual machines. If an existing device or LUN
         is not being used and now appears to be gone, it will be removed from
         ESX Server data structures and will no longer be accessible to
         virtual machines.

     -L, --lock [reserve|release|lunreset|targetreset|busreset] /vmfs/devices/disks/...
         Manage SCSI reservations on physical targets or LUNs. These
         commands can interrupt the operations of other servers on a storage
         area network (SAN), so they should be used with great caution. The
         `reserve` command will reserve the specified raw disk.
         After the reservation, other servers will get a SCSI reservation
         conflict if they attempt to access that disk, but the server that did
         the reservation will be able to access the disk normally. The
         `release` command will release the reservation on the specified
         disk. Other servers will be able to access the disk again. The
         `lunreset` command resets a single LUN only instead of all
         the LUNs attached to a target. The `targetreset`  and `busreset`
         command will reset target and bus respectively causing SCSI
         reservations to be dropped. This option is potentially disruptive to
         all servers sharing the storage and is only meant to be used
         in the context of Clustering.

     vmkfstools -C vmfs3 -b 1m -S myVMFS vmhba1:3:0:1

     Creates a new VMFS-3 file system with label `myVMFS` on the 1st partition
     of target 3 and LUN 0 of vmhba adapter 1. The file block size is 1MB.

     vmkfstools -Z vmhba0:1:2:4 vmhba1:3:0:1

     Extends the newly created file system by adding the 4th partition of tar-
     get 1 and LUN 2 of vmhba adapter 0. As a result, the file system will
     span two partitions - vmhba1:3:0:1 and vmhba0:1:2:4. Here, vmhba1:3:0:1
     is the name of the head partition of the file system that is to be

     vmkfstools -c 2048m /vmfs/volumes/myVMFS/myOS.vmdk

     Creates a 2GB VMFS virtual disk with the name `myOS.vmdk` on the VMFS
     file system named `myVMFS`. This virtual disk may then be accessed by a
     virtual machine.

     vmkfstools -i /vmfs/volumes/templates/gold-master.vmdk /vmfs/vol-

     Clones the contents of a gold master virtual disk image from a template
     repository to a virtual disk named `myOS.vmdk` on the VMFS file system
     called myVMFS. A virtual machine can be configured to use this virtual
     disk by adding the following lines to its configuration file:

       scsi0:0.present = TRUE
       scsi0:0.fileName = /vmfs/volumes/myVMFS/myOS.vmdk

     vmkfstools -r /vmfs/devices/disks/vmhbaX:Y:Z:0 foo-rdm.vmdk

     Creates a mapping file, `foo-rdm.vmdk`, to the raw disk `vmhbaX:Y:Z:0`.
     The mapping file `foo-rdm.vmdk` is created in the current VMFS working
     directory, and can be used in a virtual machine in the same manner as in
     the previous example.

     vmkfstools -s vmhba1

     Scan adapter vmhba1 for any new targets or LUNs and for any removed tar-
     gets or LUNs.

VMnix                            May 11, 2006                            VMnix
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