Quantum 3.1.4.1 manual Snfs and Virus Checking, Metadata Network

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StorNext File System Tuning

SNFS and Virus Checking

If performance requirements cannot be achieved with NFS or CIFS, consider using a StorNext Distributed LAN client or fibre-channel attached client.

It can be useful to use a tool such as netperf to help verify network performance characteristics.

SNFS and Virus Checking

Virus-checking software can severely degrade the performance of any file system, including SNFS. If you have anti-virus software running on a Windows Server 2003 or Windows XP machine, Quantum recommends configuring the software so that it does NOT check SNFS.

The Metadata Network

As with any client/server protocol, SNFS performance is subject to the limitations of the underlying network. Therefore, it is recommended that you use a dedicated Metadata Network to avoid contention with other network traffic. Either 100BaseT or 1000BaseT is required, but for a dedicated Metadata Network there is usually no benefit from using 1000BaseT over 100BaseT. Neither TCP offload nor are jumbo frames required.

It is best practice to have all SNFS clients directly attached to the same network switch as the MDC systems. Any routing required for metadata traffic will incur additional latency that impacts performance.

It is critical to ensure that speed/duplex settings are correct, as this will severely impact performance. Most of the time auto-detectis the correct setting. Some managed switches allow setting speed/duplex, such as 100Mb/full, which disables auto-detectand requires the host to be set exactly the same. However, performance is severely impacted if the settings do not match between switch and host. For example, if the switch is set to auto-detectbut the host is set to 100Mb/full, you will observe a high error rate and extremely poor performance. On Linux the

StorNext File System Tuning Guide

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Contents StorNext Copyright Statement Contents Contents Underlying Storage System StorNext File System TuningCaching RAID Cache ConfigurationRAID Write-Back RAID Read-Ahead RAID Level, Segment Size, and Stripe Size File Size Mix and Application I/O Characteristics NFS / Cifs Buffer CacheMetadata Network Snfs and Virus CheckingMetadata Controller System Stripe Groups FSM Configuration File SettingsAffinities StripeBreadth ThreadPoolSize BufferCacheSizeInodeCacheSize FsBlockSize ForcestripeAlignmentFsBlockSize JournalSize JournalSizeSnfs Tools StorNext File System Tuning Metadata Controller System StorNext File System Tuning Metadata Controller System Latency-testindex-number seconds Mount Command Options Hardware Distributed LAN Disk Proxy NetworksSnfs External API StorNext File System Tuning Guide Switch Network Configuration and TopologyDistributed LAN Client Vs. Legacy Network Attached Storage Distributed LAN ServersLoad Balancing Client Scalability Fault tolerancePerformance Robustness and Stability Consistent Security Model Windows Memory RequirementsStorNext File System Tuning Windows Memory Requirements Sample FSM Configuration File StorNext File System Tuning Sample FSM Configuration File StorNext File System Tuning Sample FSM Configuration File StorNext File System Tuning Sample FSM Configuration File StorNext File System Tuning Sample FSM Configuration File StorNext File System Tuning Sample FSM Configuration File