HP StorageWorks 8/80 HP StorageWorks Fabric OS 6.2 administrator guide (5697-0 - Page 197

When a new device is added to the fabric, it automatically becomes an implicit member of AD0 until it is explicitly added to another Admin Domain. AD0 is useful when you create Admin Domains because you can see which devices, switch ports, and switches are not yet assigned to any Admin Domains. AD0 owns the root zone database (legacy zone database). During zone merge or zone update, only the root zone database is exchanged with non-AD-capable switches. AD255 AD255 is used for Admin Domain management. You can use AD255 to get an unfiltered view of the fabric and to view the hierarchical zone databases of AD0 through AD254. All Admin Domain management is done in the AD255 context. AD255 does not have a zone database associated with it; you cannot use AD255 to perform any zoning management tasks (non-read operations, such as creating or modifying zones). Figure 22 shows the same fabric as Figure 20 on page 192, but with AD0 and AD255 shown. AD0 contains the two devices that are not in any of the user-defined Admin Domains (AD1 and AD2). AD255 encompasses the entire physical fabric. AD1 AD255 AD0 AD2 Figure 22 Fabric with AD0 and AD255 Admin Domains and login You are always logged in to a home Admin Domain, and you can view and modify only the devices in that Admin Domain. If you have access to more than one Admin Domain, one of them is designated as your home Admin Domain, the one you are automatically logged in to. If your home Admin Domain is deleted or deactivated, by default you are logged in to the lowest numbered active Admin Domain in your Admin Domain List. The home Admin Domain, like the Admin Domain list, is a configurable property of a non-default user account. Here is some additional information about AD accounts: • You can log in only to one Admin Domain at a time. You can later switch to a different Admin Domain (see "Switching to a different Admin Domain context" on page 208 for instructions). Fabric OS 6.2 administrator guide 195