since you are using a external sas enclosure, that is a setup I've never experimented before,  here is my educated guess: You issue is caused by my implementation of stable Sas disk naming, the disk name is simply derived from sas remote phy id plus SasIdxMap as start position. I think ports directly connected to hba card are 0-7, and external expansion cards inside your enclosure will start from 8 You can try to set SasIdxMap=0xfffffff8, that is -8 to move start position to 0