There is SMCLI command to remove such reservations.If the hosts have been formatted or hyper-V cluster is down then deletion / unmap of such LUNs fails due to persistent reservation. Unmap the storage from Hyper-V cluster (Remove reservation) and then unmap the LUN from host and then proceed further. In either case the solution is either to ask ESXi that the disk is perennially reserved and hence it should not scan it via: We have mapped RDM to a ESXi host so that it can be further mapped with a windows VM. ![]() We are trying to install ESXi on a node which was earlier part of Hyper-V cluster and has disks mapped to the host via storage (FC/iSCSI) with persistent reservation enabled.It is possible that during installation or boot ESXi gets stuck after displaying Use references below for more informationĪbout RDM, advantages and limitations Migration VMs with RDM Expanding size of RDM ĮSXi installation or boot gets stuck at vmw_satp_alua There are special considerations while doing vMotion or while expanding RDM devices. Physical compatibility mode: Most of the commands are pass-through to the actual device as it is.Most of the low-level access are masked and managed by ESXi. Virtual compatibility mode: In this case RDM acts like a virtual-disk file.However, if it is required to map a hardware device directly with a VM to expose low-level device APIs then we can use Raw Device Mapping (RDM). vmdk files or virtual hard-disks which can be used for persistent storage in VMs. On top of this VMFS filesystem we can create. The immediate advantage is that same LUN can be accessed in parallel for read/write from multiple ESXi hosts. ![]() Ideally we can map LUNs to ESXi hosts and create VMFS filesystem. Home > VMWare platform > VMWare vSphere or ESXi > Raw device mapping (RDM)
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