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Windows Reporting Drives Offline After Reboots

Applies to Platforms 

  • FA-3xx
  • FA-4xx
  • FlashArray//M
  • FlashArray//X

Applies to Operating Systems

  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows Server 2016
  • Windows Storage Server 2012 
  • Windows Storage Server 2016
  • Windows Server, version 1709

Resolved in Purity

Symptoms

After reboot LUNs previously connected to Windows Servers remain in an OFFLINE (VDS_SP_OFFLINE) state due to the following reason:

"The disk is offline because of policy set by an administrator".

You are able to bring the drive back into service manually by right-clicking the drive and selecting "online". Once the disk is online it is able to service IO as expected and no further issues are noted.

Diagnosis

This issue can be seen after a Purity upgrade has been performed on the FlashArray sometime since the last reboot was completed on the Windows Host. 

The reason the disks are in an offline state is because our LUNs are assigned new 'revision numbers' when an upgrade of Purity is performed. The Windows 2008 and Windows 2012 servers then interpret these as "new" disks because of this new revision number and then sets the drives to offline after a host reboot.

The primary reason this happens is because of a design change within Windows 2008 and forward where the default SAN policy for shared drives is set to the following:

VDS_SP_OFFLINE_SHARED

This means if a new shared drive is presented to a Windows Host it will keep the drive offline to ensure that drive should be presented to this host. If that drive is supposed to be presented to the specific host then it can be brought online as needed by the Administrator.

Solution

The first step to resolving this issue is changing the SAN Policy to "Online All"  as per our Windows Configuration: Configuring MPIO & Adding LUNs to Windows Hosts KB. By setting this policy you ensure that any newly created disks attached to the Windows Server will be in an online state after a Windows Server reboot. 

This task can be completed by following the Microsoft TechNet Article: https://technet.microsoft.com/en-us/library/gg252636.aspx

If the SAN Policy was set to 'Offline Shared', and disks were already presented to the Windows host from the FlashArray, then you must edit the existing disks 'Attributes' to ensure they will remain online following a Purity upgrade and Windows host reboot.  For assistance with this, please contact Pure Storage Support.