How to Export a Virtual Disk Back End Multiple Times

---

Caution  - When a virtual disk back end is exported multiple times, applications running on guest domains and using that virtual disk are responsible for coordinating and synchronizing concurrent write access to ensure data coherency.

---

The following example describes how to add the same virtual disk to two different guest domains through the same virtual disk service.

1. Export the virtual disk back end two times from a service domain.

   ldm add-vdsdev [options={ro,slice}] backend volume1@service-name
   # ldm add-vdsdev -f [options={ro,slice}] backend volume2@service-name

   Note that the second ldm add-vdsdev command uses the –f option to force the second export of the back end. Use this option when using the same back-end path for both commands and when the virtual disk servers are located on the same service domain.

2. Assign the exported back end to each guest domain.

   The disk-name can be different for ldom1 and ldom2.

   ldm add-vdisk [timeout=seconds] disk-name volume1@service-name ldom1
   # ldm add-vdisk [timeout=seconds] disk-name volume2@service-name ldom2