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Net Load Analysis

Net Load Analysis. Mohan / Jog : NFS Root Servers Bahar : NFS Homes + httpd + NIS + DNS Megh : NFS Homes + DNS Desh : sendmail + NIS + local mails Sri : telnet/ftp server. Mohan: NFS Root Server. Mohan: NFS Root Server. Mainly NFS traffic High NFS data rate Negligible TCP traffic

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Net Load Analysis

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  1. Net Load Analysis • Mohan / Jog : NFS Root Servers • Bahar : NFS Homes + httpd + NIS + DNS • Megh : NFS Homes + DNS • Desh : sendmail + NIS + local mails • Sri : telnet/ftp server

  2. Mohan: NFS Root Server

  3. Mohan: NFS Root Server • Mainly NFS traffic • High NFS data rate • Negligible TCP traffic • NFS Reply data > NFS requests data, hence large data blocks being sent.

  4. Megh: NFS Homes + DNS

  5. Megh: NFS Homes + DNS • Mainly NFS traffic • NFS Reply data  NFS Request data, hence small-sized read requests.

  6. Bahar: NFS Homes+httpd+NIS

  7. Bahar: NFS Homes+httpd+NIS • Main NFS load • Significant TCP load : largely httpd • Large portion of TCP fragments, ie. Large data chunks • Higher rate of UDP(NIS) packets, but low data rate.

  8. Desh: sendmail + NIS

  9. Desh: sendmail + NIS • Large NFS traffic due to NFS export of /var/spool/mail • Significant number of TCP and NIS (UDP) packets, but low data rate • Higher ARP requests compared to internal broadcasts.

  10. Sri: telnet / ftp server

  11. Sri: telnet / ftp server • Principle component NFS (home) traffic • Considerable TCP traffic • Less fragments, hence primarily telnet sessions.

  12. Comparative Analysis

  13. Comparitive Analysis • Highest load is on NFS Root server • Users generally access small chunks of files. • Although NIS and sendmail network load is low, CPU load might be considerably higher. • DNS is a low cost process ( both for net and CPU )

  14. Comparative Analysis • Broadcasts within the LAN are usually constant, depending upon number of machines booted up • External FTP load is low, although the web (http) traffic might not be so.

  15. Memory Dependence

  16. Memory Dependence

  17. Memory Dependence

  18. Memory Dep. Analysis • Increasing system RAM beyond 64M would not reduce boot-up NFS load. • At 64M, page faults  clients, hence the config files get paged in. • At 48M, nfsd replaces pages of X with the pages of files needed for bootup. Hence beyond 4 clients the page faults reduce.

  19. Memory Dep. Analysis • Total size of files needed for NFS bootup is larger than 32M. Hence, even after 4 clients, page faults is almost constant. • Avg. Page faults / time is greater for NFS home servers than NFS Boot servers. Hence, RAM requirements of NFS homes is highest.

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