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To give multiple users shared, secure access to the same data, you can set a volume to read-only access. Run this command to set a volume to read-only access: $ cinder read-only-mode-update VOLUME BOOLEAN Where VOLUME is the ID of the target volume and BOOLEAN is a flag that enables read-only or read/write access to the volume. Valid values for BOOLEAN are: true. Sets the read-only flag in the volume. When you attach the volume to an instance, the instance checks for this flag to determine whether to restrict volume access to read-only. false. Sets the volume to read/write access.