Why WAN accelerators (still) matter? Andrea Dainese Data Center Engineer

Transcription

1 Why WAN accelerators (still) matter? Data Center Engineer

2 Presentation Data Center Cerved Group SpA Red Hat RHCE VMware VCP-DCV NetApp NCIE-SAN Cisco CCIE Who is Andrea Dainese Cisco Architecture Design Specialist VMware vexpert Cisco Champion Data Center iou-web and Unified Networking Lab author

3 Presentation Agenda a real case

4 Presentation a real case

5 WAN Optimization VS Bandwidth Upgrade

6 Audience Dark Fibers VS Shared Lines

7 Presentation The TCP Protocol The TCP protocol a real case

8 The TCP Protocol The TCP protocol UDp [0,536 GB, 3,36 %] TCP Transmission Control Protocol ICMP [0,003 GB, 0,02 %] udp User Datagram Protocol ICMP Internet Control Message Protocol TRAFFIC (Inbound and Outbound) Total [15,968 GB] tcp [15,429 GB, 96,63 %] ICMP [0,003 GB, 0,02 %] tcp [15,429 GB, 96,63 %] UDp [0,536 GB, 3,36 %]

9 TCP Handshake TCP Handshake SYN 50 ms SYN, ACK 100 ms ACK 150 ms

10 TCP Windowing TCP Windowing Request Request 50 ms 50 ms 100 ms Segment 1 ACK Segment 1 Segment 2 Segment 3 Segment ms Segment ms ACK 200 ms 150 ms 10 Packets/s 117 Kb/s 425 Packets/s 4980 Kb/s

11 TCP Selective Acknowledge TCP Selective Acknowledge Request Request Segment 1 Segment 2 Segment 3 Segment 4 Segment 1 Segment 2 Segment 3 Segment 4 ACK 1 ACK 1, SACK 3 ACK 1 ACK 1, SACK 3, 4 Segment 2 Segment 3 Segment 2 Segment 4 ACK 2 ACK 3 ACK 4 ACK 4

12 TCP Slow start TCP Slow start 130 Packet Loss 120 Congestion window size (segments) Congestion Control Exponential Growth Multiplicative Decrease Congestion Avoidance Round Trips

13 Presentation a real case

14 Replication: 27% web [2 %] SQL: 33% other traffic [37 %] Other Traffic (CIFS, , FTP, ): 37% sql [33 %] replication [27 %] other traffic [37 %] web [2 %] sql [33 %] replication [27 %]

15 NetApp SnapMirror Uncompressed Inter-DC Traffic CHARACT Unencrypted Oracle SQL Uncompressed Unencrypted ERISTICS FTP

16 Inter-DC Traffic CHARACT NetApp SnapMirror Uncompressed Unencrypted Oracle SQL Uncompressed Unoptimized! Unencrypted ERISTICS FTP

17 a real case

18 WAN optimization: key elements Data deduplication Data deduplication

19 WAN optimization: key elements Data compression Data compression

20 WAN optimization: key elements Data deduplication Data deduplication and compression Data compression Data deduplication compression

21 TCP optimization Large initial windows tcp optimization Window scaling Advanced congestion avoidance Selective Acknowledgement Large buffer

22 Applications Object caching tcp Applications Local response handling Prepositioning Read-ahead Write-behind

23 a real case

24 Before and after 200 M 180 M 160 M Traffic in bps 140 M 120 M 100 M 80 M 60 M 40 M 20 M

25 Before and after before After reduction Total 46.0 TB 13.9 TB 70 % Replication 11.8 TB 2.9 TB 75 % SQL 14.2 TB 4 TB 71 % FTP (Other) 17 TB 5 TB 70 %

26 Reduction (%) :00 18:00 21:00 0:00 3:00 6:00 9:00 12: Traffic (GB) Reduction (All Traffic) Time (h:mm) Original (All Traffic) Optimized (All Traffic)

27 4.5 Effective Capacity (X) /18 8/21 8/24 8/27 8/30 9/2 9/5 9/8 9/11 9/14 Time (M/d)

28 lz Optimized TFO, DRE, LZ DRE Original Optimized Reduction Transfer 725 MB 25 MB 96 % DRE 725 MB 92 MB 87 % LZ 92 MB 25 MB 73 % DRE OPTIMIZED LZ

29 A real case TFO, DRE, LZ

30 a real case

31 Components of WAVE Appliance: up to TCP connection, 96GB RAM, 4.2TB up to 6 virtual blades for installation WAAS for ISR: vwaas: up to 50000? TCP connection, 8vCPU, 48GB RAM Components of a waas solutions WAAS Mobile: WAAS Express: CM/vCM up to 400 TCP connection, 10Mbps, 4GB RAM fully integrated into IOS, ISR G2 series

32 Inline Layer 2 Cisco WAE WAN Layer 3 WAN

33 Inline (with HA reachability) Layer 2 Preferred Path Cisco WAE HSRP Active WAN HSRP Stanby

34 Inline (with HA) Layer 2 Cisco WAE Cisco WAE WAN

35 WCCP Layer WAN Cisco WAE

36 WCCP (with HA) Layer 3 WAN Cisco WAE Farm

37 Site B Autodiscovery Site A WAN Site C Cisco WAE Cisco WAE

38 Inline VS WCCP inline wccp Connected routers 1 Many Resources Transparent CPU Intensive Failover Mechanical bypass mode Keepalive HA Serial Parallel Scaling Scale-Up Scale-Out

39 a real case

40 Do not optimize latency sensitive protocols (i.e. VoIP). Leave traffic uncompressed and unencrypted for better optimization Install root certificates for HTTPS optimization. Add WAAS to AD for Encrypted MAPI optimization. TIPS & TRICKS Use CIFS optimization for faster folder browsing on branch offices. Consider disabling Metadata Cache and local HTTP 301 Redirect (i.e. Joomla).

41 a real case

42 Does WAN yes accelerators (still) matter?

43 thanks