StorNext File System Tuning
File Size Mix and Application I/O Characteristics
| Command Options on page 16). So, it is typically most important to | |
| optimize the RAID cache configuration settings described earlier in this | |
| document. | |
| It is usually best to configure the RAID stripe size no greater than 256K | |
| for optimal small file buffer cache performance. | |
| For more buffer cache configuration settings, see Mount Command | |
| Options on page 16. | |
| It is best to isolate NFS and/or CIFS traffic off of the metadata network to | |
NFS / CIFS | ||
eliminate contention that will impact performance. For optimal | ||
| ||
| performance it is necessary to use 1000BaseT instead of 100BaseT. When | |
| possible, it is also best to utilize TCP Offload capabilities as well as jumbo | |
| frames. | |
| It is best practice to have clients directly attached to the same network | |
| switch as the NFS or CIFS server. Any routing required for NFS or CIFS | |
| traffic incurs additional latency that impacts performance. | |
| It is critical to make sure the speed/duplex settings are correct, because | |
| this severely impacts performance. Most of the time | |
| correct setting. Some managed switches allow setting speed/duplex (for | |
| example 1000Mb/full,) which disables | |
| be set exactly the same. However, if the settings do not match between | |
| switch and host, it severely impacts performance. For example, if the | |
| switch is set to | |
| observe a high error rate along with extremely poor performance. On | |
| Linux, the | |
| duplex settings. | |
| A higher performance alternative to NFS and CIFS is ISCSI. If | |
| performance requirements cannot be achieved with NFS or CIFS, SCSI | |
| should be considered. | |
| It can be useful to use a tool such as netperf to help verify network | |
| performance characteristics. |
StorNext File System Tuning Guide | 6 |
