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frozen frames are found in videos when customer use OceanStor 5300 V3 CIFS share

Publication Date:  2017-12-23 Views:  23 Downloads:  0
Issue Description

A customer's network is of poor quality and the network latency is long. When a client accesses a storage system through CIFS, the access performance is low. At a site in India, when an upper-layer application on a client accesses a CIFS shared folder on an OceanStor 5300 V3 storage system, frozen frames are found in videos. From the CIFS status statistics collected on the storage system, it is
found that the internal latency of the storage system is normal. However, by using the client to ping the IP address of the storage system, it is found that the latency is long.

Solution

Increase the CIFS block transfer size on the storage system and client, thereby reducing the number of packets transferred over the network.

l  One the storage system, run the following command:

developer:/> change service cifs_config max_block_size=1048576


l   On a client that runs Windows Sever 2008 R2 or later, change the block transfer size as follows:

1.      Pressing the Windows key + R to open the Run dialog box.

2.       Enter regedit to open the registry.

3.       Change the block transfer size.

Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Lanmanworkstation\Parameters, create a DWORD item, name it SizReqBuf, and set the value to 1048576 (namely, 1 MB).

4.       Enable the support for jumbo frames.

Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Lanmanworkstation\Parameters, create a DWORD item, name it DisableLargeMtu, and set the value to 0.

5.       Change the maximum TCP window size.

Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters, create a DWORD item, name it GlobalMaxTcpWindowSize, and set the value to hexadecimal 1000000.

6.       Change the TCP window size.

Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters, create a DWORD item, name it TcpWindowSize, and set the value to hexadecimal 1000000.

END