VMware, snapshot, LUN, UUID, resignature, re-signature, snapshot, VMFS, vmfs3, vmfs5, LVM.DisallowSnapshotLUN, LVM.EnableResignature, DisallowSnapshotLUN, EnableResignature" />

VMware Datastore Snapshot LUNs and LUN Presentation

VMware Datastore Snapshot LUNs and LUN Presentation


VMware cannot see all VMFS volumes presented, LUN is inaccessible, VMFS is inaccessible after major RAID event, etc.

One of the components making up the signature of the VMFS has changed. Most often this is caused by a VMFS being presented on a different SCSI ID. This condition has also sometimes been caused by certain Dell PERC firmware upgrades and can be caused by major RAID failures (such as re-tagging drives after a multi-disk failure, etc.)


As with all good troubleshooting, you need to understand the situation before taking any action. Incorrectly jumping to conclusions on how to troubleshoot this could possibly lead to unnecessary data loss or downtime.

There is a VMFS Volume Management guide and numerous VMware KB articles that discuss the possible scenarios. It is important to read and understand all possible scenarios before taking action.

Read and understand the VMware VMFS Volume Management document before making any changes, as data loss can occur with certain configurations.

Generally speaking with a snapshot - the right behavior, is that you enable resignaturing, and rescan, and the LUN appears. With a DR cluster that hasn't seen that LUN before, you Disallow snapshot LUNs, rescan.
Note: **Before making any changes in production environments, it is ways a great idea to perform test on non-critical data in your own test environment, just like you do for your other mission-critical IT elements.**

Below is a list of good general-purpose troubleshooting KB's:




Quick Tips content is self-published by the Dell Support Professionals who resolve issues daily. In order to achieve a speedy publication, Quick Tips may represent only partial solutions or work-arounds that are still in development or pending further proof of successfully resolving an issue. As such Quick Tips have not been reviewed, validated or approved by Dell and should be used with appropriate caution. Dell shall not be liable for any loss, including but not limited to loss of data, loss of profit or loss of revenue, which customers may incur by following any procedure or advice set out in the Quick Tips.

Artikel-ID: SLN147523

Senast ändrad: 02/06/2017 11:13 AM


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