Contract # GS00T01AHD0002 
Proposal to Add Federal Telecommunications Service   Long Distance (FTS LD) 
6.7.10.4  Network Attached Storage (NAS) on Demand 
Network Attached Storage (NAS) on Demand is another optional primary data 
storage solution available. NAS on Demand is perfect for read intensive applications 
requiring multiple servers to access the same data.  
This differs from SAN by utilizing an IP network architecture, rather than a fibre 
channel technology. With NAS on Demand, file systems rather than raw storage 
volumes are made available over the network and the file server manages the data 
placement.  
NAS on Demand is client oriented, so that I/O commands are made via a standard IP 
connection. The file server manages data placement. As a result, NAS on Demand 
can provide file sharing among users and among operating systems via Network File 
System (NFS) for UNIX and Common Interface File System (CIFS) for NT protocols. 
Multiple hosts can see the file systems simultaneously. Refer to Table 6.7.10.4 1 for 
Managed Storage services comparisons. 
Table 6.7.10.4 1. Managed Storage Services Comparison 
External Architecture 
SAN on Demand 
NAS on Demand 
Protocol 
Block 
File (NFS, CIFS) 
Latency Low 
Standard 
IP 
Data Security 
High  no sharing 
Shared with Controls 
Application 
Data not shared 
Shared 
Server Hardware 
HBAs 
NICs 
NAS on Demand can utilize existing NICs. There is no additional server side 
hardware or software required, assuming NICs exist
.  
This service is provided in conjunction with StorageNetworks. NAS on Demand is 
not available in all AT&T Internet Data Centers. Other restrictions may apply. 
Use or disclosure of data contained on this sheet is subject to the restriction on the title page of this proposal. 
f:\mcghee\vol_1sec6d_r.doc 
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