Computer and Software Support


SAN 

 

DiskPart 

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Syntax: san [policy={OnlineAll | OfflineAll | OfflineShared}] [noerr]

Parameter: policy={OnlineAll | Offlineall | OfflineShed}]

Sets the SAN policy for the currently booted operating system. The SAN policy determines whether a newly discovered disk is brought online or remains offline, and whether it becomes read/write or remains read-only. When a disk is offline, the disk layout can be read, but no volume devices are surfaced through Plug and Play. This means that no file system can be mounted on the disk. When a disk is online, one or more volume devices are installed for the disk. The following is an explanation of each parameter:

  • OnlineAll. Specifies that all newly discovered disks will be brought online and made read/write.

 

Important

Specifying OnlineAll on a server that shares disks could lead to data corruption. Therefore, you should not set this policy if disks are shared among servers unless the server is part of a cluster.

  • OfflineAll. Specifies that all newly discovered disks except the startup disk will be offline and read-only by default.

  • OfflineShared. Specifies that all newly discovered disks that do not reside on a shared bus (such as SCSI and iSCSI) are brought online and made read-write. Disks that are left offline will be read-only by default.

For more information, see VDS_SAN_POLICY Enumeration ( http://go.microsoft.com/fwlink/?LinkId=203815 ).

Remarks

  • If the commnd is given with no parameters, the current SAN policy is displayed.

 

Examples

To view the current policy, type:

san

 

To make all newly discovered disk, except the startup disk, offline and read-only by default, type:

san policy=OfflineAll