HP NetServer AA 4000 HP AA HP Netserver 4000 Reference Guide - Page 22

Putting it all together

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HP NetServer AA Putting it all together Before the conclusion of the chapter, the following is a review of all of the AA 4000 components and how they work together. Using the diagram below, the best way to understand how the system works, is to trace a typical client transaction with the HPAA system. 1. The client requests (for example) to perform a databse query. 2. The NIC on both IOPs has picked up the network traffic and will immediately pass the packet to the MIC and later to the CE for the parsing of the network packet. At this point the IOPs are not looking at any information in the packet, it is simply acting as a pass-through for all packets regardless of their intended destinaiton. 3. The NIC passes the packet to the MIC. 4. The MIC on each IOP passes the packet to its own SSDL for its tuple. 5. The SSDL passes the packet "as-is" to the MIC on the CE. At this point the packet is going to both CEs from both SSDLs at the same instance. 6. The CE looks at the packet and begins to do the parsing to determine if the packet is to be "dropped" or passed on to the rest of the OSI layers. At this point the CE then performs the query to the database. It will be accessing the disks on each IOP via the MICs. Each tuple will perform this. At the CE level all I/O going in and out of the MICs in 1-16 Hewlett-Packard Company

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HP NetServer AA
Hewlett-Packard Company
1-16
Putting it all together
Before the conclusion of the chapter, the following is a review of all
of the AA 4000 components and how they work together.
Using the
diagram below, the best way to understand how the system works, is
to trace a typical client transaction with the HPAA system.
1.
The client requests (for example) to perform a databse query.
2.
The NIC on both IOPs has picked up the network traffic and will
immediately pass the packet to the MIC and later to the CE for
the parsing of the network packet. At this point the IOPs are not
looking at any information in the packet, it is simply acting as a
pass-through for all packets regardless of their intended
destinaiton.
3.
The NIC passes the packet to the MIC.
4.
The MIC on each IOP passes the packet to its own SSDL for its
tuple.
5.
The SSDL passes the packet “as-is” to the MIC on the CE.
At
this point the packet is going to both CEs from both SSDLs at
the same instance.
6.
The CE looks at the packet and begins to do the parsing to
determine if the packet is to be “dropped” or passed on to the
rest of the OSI layers.
At this point the CE then performs the query to the database.
It will
be accessing the disks on each IOP via the MICs.
Each tuple will
perform this.
At the CE level all I/O going in and out of the MICs in