Hi,

what protocols do you specifically mean ?

a CX4-960 isnt a Celerra - it’s a Clariion.

Sorry! Yes, it's clariion.

I mean CIFS and NFS. Some customers connects with NFS, some with CIFS

Well if it is just a Clariion then it doesn’t speak NFS or CIFS – just FC or ISCSI

You would either have a Celerra gateway in front of it or some Windows / Unix servers

BTW these parameters wont help you

the rcp param is only effective for replication with Replicator or nas_copy anyway

On the Celerra we automatically negotiate to the largest possible TCP Window size that the client supports.

If you have performance problems - its not because of tcp window size - that typically only make a difference on WAN connections.

I suggest to open a service request with EMC customer service.

They can also analyze network trace to see if its really a network problem.

Well – if it is a Celerra than I suggest to first try setting the fastRTO parameter before playing with tcp window size manually

Do a search here on the forum for fastRTO – there should be a number of posts from customers where it helped

I'm a new ingeneer in a company. I dont know this system will, like other ingeneers. Maybe we have celerra gateway. But i know, that we create nfs and cifs servers and shares.

Oh, thank you!

I found posts about fastRTO. THere people said to change fastRTO value from 0 to 2. In a manual to system i read that only 2 values: 0 or 1. I think that 0 is OFF, all other values (1,2,3 or other) is mean ON? Right?

Yes – setting it to 1 means fastRTO on

We are did connect 2 PC on windows XP with same network. In registry we changed tcp windows size (about 202KB), tcp1323options (window scaling and timestamps) and use tcp optimizer utility to change all parameters to optimal. After that we get 10-12 MB/sec data transfer.

Does your system have same options (tcp window size, tcp1323 options & others)?

We changed fastRTO. Unfortunately, unhelpfully.

We examinated connection speed. When we send data to storage speed about 5-6MB/sec, tcp window 251byte(!), when we copy data from storage speed is 17kB and speed about 2MB/sec.

How i could open service request?