Brings online disks and volumes that are currently offline.

Important

The disk and volume parameters of the online command are not available in any edition of Windows Vista.

Important

This command will fail if it is used on a read-only disk or volume.

For examples of how this command can be used, see Examples.

Syntax

online {disk|volume} [noerr]

Parameters

Parameter Description

disk

Brings online the disk with focus. This parameter makes the online command operate on a single disk.

volume

Brings online the volume with focus. This parameter makes the online command operate on a single volume.

noerr

For scripting only. When an error is encountered, DiskPart continues to process commands as if the error did not occur. Without this parameter, an error causes DiskPart to exit with an error code.

Remarks

  • When used without parameters in Windows Vista, this command operates on a disk pack. For basic disks, there is never more than one disk per pack. For dynamic disks, the pack includes all non-foreign dynamic disks.

  • For basic disks, the online disk command will attempt to bring online the selected disk and all volumes on that disk.

  • For dynamic disks, the online disk command will attempt to bring online all disks that are not marked as foreign on the local machine. It will also attempt to bring online all volumes on the set of dynamic disks.

  • If a dynamic disk in a disk pack is brought online and it is the only disk in the pack, then the original pack is recreated and the disk is moved to that pack. If there are other disks in the pack and they are online, then the disk is simply added back into the pack.

  • The online volume command operates on volumes that have failed, are failing, or are in failed redundancy state.

  • The online disk command operates on disks that are in SAN offline mode. It changes their SAN mode to online.

  • If the pack of a selected disk contains mirrored or RAID-5 volumes, the online disk command also resynchronizes these volumes.

  • A disk must be selected for the online disk command to succeed. Use the select disk command to select a disk and shift the focus to it.

  • A volume must be selected for the online volume command to succeed. Use the select volume command to select a volume and shift the focus to it.

Examples

To bring the disk with focus online, type:

online disk

To bring the volume with focus online, type:

online volume

Additional references


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