PowerFlex: Volumes are Read Only if MDM Cluster has no Tie Breaker
Summary: If only one MDM and no tie-breaker is available, the volume goes into read-only mode.
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Symptoms
A mounted Linux volume goes into read-only mode due to an MDM failure.
Cause
If only one MDM is available and no tie-breaker is available, ScaleIO places the volume into read-only mode. At this point, Linux makes the volume read-only as well.
Resolution
Ensure that there are at least two MDM nodes (a Primary and a tie-breaker).
Alternatively, you can place the MDM cluster in single node mode, but this is not recommended for a production environment.
Once this is done, you must reboot the Linux server to make the volume accessible again. If using VMware ESXi, perform a rescan of the storage devices.
Affected Products
VxFlex Product FamilyProducts
VxFlex Product FamilyArticle Properties
Article Number: 000035966
Article Type: Solution
Last Modified: 05 Jan 2026
Version: 6
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