Dell DX6000G DX Storage CFS Release Notes - Page 7
Dependent Service Restart after CFS Process Error
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• Maximum Network Connections CFS will support a maximum of 10000 open network connections at any one time. • Maximum File Name Length The maximum supported length for the name of a file in CFS is 255 characters. Attempting to create a filename that exceeds this length will result in an error that the filename is too long. • Temp Space Configuration A large spool space (> 200GB) is not necessary, and indeed can hurt performance in some scenarios. The spool directory's file system should be configured with enough space to keep a maximum of 100,000 files. • Space Reporting When reporting file system capacity via a tool like 'df', CFS will under-report DX Storage available capacity by 10% as a reserve for files currently in the spooling state. • Dependent Service Restart after CFS Process Error The monitoring service that restarts DX Storage CFS in the event of an error cannot restart other dependent services like NFS or Samba as they may be in use by other applications. A restart of those services may be required to restore full access to CFS. • Conflicting Reads and Truncates Truncating a large file while it is being read can possibly result in the last section of the read file containing null bytes to fill in the portion that was truncated. • Samba Case Sensitivity By default Samba is case insensitive which can have a significant impact on performance, particularly when storing a large number of files in a single directory. Tuning the Samba parameters to support case sensitivity may provide performance improvements but is not appropriate for all use cases. Please contact your technical account manager for more information on the tradeoffs between performance and case sensitivity. Copyright © 2011 Caringo, Inc. All rights reserved 4 Version 2.6.1 March 2011