In part 3 of his look at What's Up with LDoms, Stefan Hinker takes a closer look at disk backend choices. He explains that a disk backend, in LDoms language, is the physical storage used when creating a virtual disk for a guest system. In other virtualization solutions, these are sometimes called virtual disk images, a term that doesn't really fit for all possible options available in LDoms. He reminds readers that, in his earlier postings, he had used a ZFS volume as a backend for the boot disk of mars. In this segment, Hinker examines some of the other ways to store the data of virtual disks. These include P\physical LUNs, in any variant that the Control Domain supports, including SAN, iSCSI and SAS, as well as the internal disks of the host system; Logical Volumes like ZFS Volumes, but also SVM or VxVM; Regular Files., which can be stored in any filesystem, as long as they're accessible by the LDoms subsystem. This includes storage on NFS. Each of these backend devices has its own set of characteristics that should be considered when deciding which backend type to use. He examines them in these terms.

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