Fibre Channel (SAN)

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Occasional Contributor
Posts: 9
Registered: ‎09-09-2009

FCIP tunnel Transfer Rate

Hi,

We have an FCIP set up of 7500E  from DC to DR which is running on a 1Gbps link.

The commit rate of FCIP Tunnel has been set to 512000Mbps(.512Gbps) in both 7500E . As per my understanding the max. data can be transfer through this link should be 64MB/Sec.

But from BNA12.0 & through portperfshow command it shows the transfer rate up 100MB/Sec.

Can anyone tell me what could be the reason to show the transfer rate more than the commited rate?

Valued Contributor
Posts: 761
Registered: ‎06-11-2010

Re: FCIP tunnel Transfer Rate

Hi there,

512000 Mbps is 512 Gbps and not 0.512Gbps. Could it be that you've set an uncorrect commit rate?

rgds

Occasional Contributor
Posts: 9
Registered: ‎09-09-2009

Re: FCIP tunnel Transfer Rate

Sorry felpon.... Actually it is 512000 Kbps(.512Gbps)

Please see the tunnel parameters below:

Port: ge1

-------------------------------------------

        Tunnel ID 0

        Tunnel Description Not Configured

        Remote IP Addr 10.x.x.x

        Local IP Addr 10.x.x.x

        Remote WWN Not Configured

        Local WWN 10:00:00:05:1e:c1:f3:ce

        Compression on

        Fastwrite off

        Tape Pipelining off

        Committed Rate 512000 Kbps (0.512000 Gbps)

        SACK on

        Min Retransmit Time 100

        Keepalive Timeout 10

        Max Retransmissions 8

        VC QoS Mapping off

        DSCP Marking (Control): 0, DSCP Marking (Data): 0

        VLAN Tagging Not Configured

        TCP Byte Streaming off

        Status : Active

        Connected Count: 4

        Uptime 22 hours, 52 minutes, 36 seconds

Regular Contributor
Posts: 178
Registered: ‎04-21-2008

Re: FCIP tunnel Transfer Rate

Hi rajesh,

portperfshow gives you performances on VE-ports, ie. _before_ FCIP compression.

Have a look at portshow fciptunnel all -perf to get compression ratio (under QoS shaper performance stats section), it may be an explanation

Kind regards,

--

david

Occasional Contributor
Posts: 9
Registered: ‎09-09-2009

Re: FCIP tunnel Transfer Rate

Thanks David. I agreed. but the graph which I have taken from BNA12.0 should show the compressed data size... right?

It show the data transfer touches 85MB.

please refer the attachment.Tx_data.jpg

Regular Contributor
Posts: 178
Registered: ‎04-21-2008

Re: FCIP tunnel Transfer Rate

It probably should indeed ... But I'm not really familiar with BNA

To see if this is a real commited rate issue or wrong information reported by BNA, I would get SNMP ifHCInOctets and ifHCOutOctets counters on ge interfaces (look at 268435456 index for ge0, 268435457 for ge1) and thus real IP traffic on ge ports

Hope this helps

Kind regards,

--

david

Occasional Contributor
Posts: 9
Registered: ‎09-09-2009

Re: FCIP tunnel Transfer Rate

Thanks a lot  David. One more query, how can I get 

SNMP ifHCInOctets and ifHCOutOctets counters on ge interfaces (look at 268435456 index for ge0, 268435457 for ge1)

Regular Contributor
Posts: 178
Registered: ‎04-21-2008

Re: FCIP tunnel Transfer Rate

You have to use a SNMP client (such as net-snmp, which is included in most unix/lunix distributions) and then query 7500 MIB ... something like 'snmpwalk -v2c -c public <router IP> ifHCInOctets'

Kind regards,

--

david

Occasional Contributor
Posts: 9
Registered: ‎09-09-2009

Re: FCIP tunnel Transfer Rate

Thanks David.

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