heaton1
2 Bronze

Tuning FCIP performance

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Hi All,

Any advice on tuning FCIP on MDS9513 (4.2.3) 18/4 modules is greatly appreciated!

We have 4x1Gb FCIP connections, and currently we are only getting a maximum of 200MB/s throughput in total - about 1/2 what i would hope to achieve.

This is our config (A only)

We have an MDS9513, with an 1x18/4 module and 2xGbE connections, connecting to a 2nd MDS9513 (Same h/w config) at a remote site.

The GbE connections traverse a 10Gb Network connection between our Primary and Secondary sites. Our FCIP bandwidth is shared with other services - but the 10Gb Network utilisation is always less then 30%..

Currently we are only achieving a max 50MB/s on each FCIP port.

The round trip time is 6ms,

Jumbo frames enabled on the network,

MTU set to 2300

Max Bandwidth = 1000

Min Bandwidth = 1000 (is this good practice or should I be using 90% of the Max perhaps?)

Compession not currently enabled

Send buffer size is 0kb

Burst size is 50Kb.

Tape Accelerate and Fast write are not enabled.

The purpose of this connectivity is to use Open Replicator to pull data from a Clariion to a DMX4. Therefore as far as I'm aware - Fast write and Tape acceleration won't help us in this scenario? (For info - we are copying multiple luns, from multiple controllers - and so the bottleneck is not the source or target storage ports).

Other changes Im considering are to increase the send buffer size to 16384.

Could anyone suggest how to further troubleshoot or tune this environment please?

Many thanks

Mark

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healyj
3 Argentum

Re: Tuning FCIP performance

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Hi there,

In our efforts to clean up the forum, we came across your question / statement.

If the question / statement is still valid, not expired and you need an update please reach out again and we try to get it answered.

As for now we will set it to “answered.”

Regards,

Jim

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heaton1
2 Bronze

Re: Tuning FCIP performance

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Some additional info...


<Switch anem)# show fcip profile 1
FCIP Profile 1
    Internet Address is xxx.xxx.xxx.34  (interface GigabitEthernet13/1)
    Tunnels Using this Profile: fcip1
    Listen Port is 3225
    TCP parameters
        SACK is enabled
        PMTU discovery is enabled, reset timeout is 3600 sec
        Keep alive is 60 sec
        Minimum retransmission timeout is 200 ms
        Maximum number of re-transmissions is 4
        Send buffer size is 0 KB
        Maximum allowed bandwidth is 1000000 kbps
        Minimum available bandwidth is 1000000 kbps
        Configured round trip time is 6000 usec
        Congestion window monitoring is enabled, burst size is 50 KB
        Auto jitter detection is enabled

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baumgj1
2 Bronze

Re: Tuning FCIP performance

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See Primus emc147059 it may help looks like you are using the default min/max bandwidth settings..

To correctly configure the FCIP profile maximum/minimum bandwidth, apply the following formula:

Total network bandwidth dedicated for FCIP ONLY:

Divide total dedicated link bandwidth by all FCIP profiles, using the link, that will give you the maximum bandwidth per tunnel.

Multiply that value by .92 and that will be your minimum bandwidth parameter.

Additionally you  MUST verify the network MTU size from MDS to MDS switch and ALL devices in between must support that value. Review the EMC Knowledgebase solution emc86081 for the steps to verify the MTU settings.

-Jeff

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healyj
3 Argentum

Re: Tuning FCIP performance

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Hi there,

In our efforts to clean up the forum, we came across your question / statement.

If the question / statement is still valid, not expired and you need an update please reach out again and we try to get it answered.

As for now we will set it to “answered.”

Regards,

Jim

View solution in original post

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