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If you see a message resembling:
Issuing SCSI TEST UNIT READY to disk reserved by other node FAILED. Contact the storage provider to have the hardware configuration fixed. The disk array does not support returning success for a SCSI TEST UNIT READY command when another host has the disk reserved using SCSI-3 persistent reservations. This happens with Hitachi Data Systems 99XX arrays if bit 186 of the system mode option is not enabled.