HP StorageWorks Fabric OS 6.2 administrator guide (5697-0016, May 2009)

Fabric OS 6.2 administrator guide 195
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.
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).
AD2
AD255
AD1
AD0