HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 150
Zone FlexPars, notifications RSCNs are transmitted to all attached devices when
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Implementing SAN Internetworking Solutions 4 • Create up to three additional FlexPars and assign resources to those FlexPars. • Perform director firmware upgrades to all Flexpars. • Enable or disable the protocol subsystem for any Flexpar. • Enable or disable switch modules and control processor (CTP) cards. • Perform director shutdowns, restarts, and field-replaceable unit (FRU) switchovers. • Set the director Internet protocol (IP) address, gateway address, and subnet mask. • Set the director date and time. NOTE: An Intrepid 10000 Director set to fibre connection (FICON) management style can have only one Flexpar (0) enabled. Zone FlexPars Flexpar functionality aggregates small (32 port or less) and medium (up to 256 port) SAN islands to a single point of control. Director FlexPars are not intended to enable creation of larger fabrics. Regardless of the number of Flexpars enabled, the maximum total fabric size (summing all Flexpars) is limited to the maximum configuration supported by the Director. Similarly, limits for other fabric scalability elements (such as number of zones per zoneset) may not exceed the maximum supported by a single fabric. Because zoning is managed on a fabric wide basis, all directors and fabric switches in a zone must maintain consistent zoning information. To ensure consistency, registered state change notifications (RSCNs) are transmitted to all attached devices when a zoning change occurs, when a device is set offline or online, or when a local switch is connected to or disconnected from the fabric. When a device becomes available or unavailable, an RSCN is transmitted only to devices in the same zone. However, a zoning change causes an RSCN to be transmitted to all the devices in the fabric. As fabrics grow larger, numerous RSCNs from zoning changes can create congestion and disrupt devices, causing a pause in normal activity to determine status of the other devices. In fact, many legacy host bus adapters (HBAs) cease operation as they query the fabric name server upon receipt of an RSCN. 4-6 McDATA Products in a SAN Environment - Planning Manual