Dell PowerVault DR2000v - Manual (Page 133)

• File write locks across clients
Rapid NFS starts accelerating only after 8 MB is sequentially written to files (tunable in 4 MB
multiples). You can configure the file MIME types to go through acceleration in rdnfs.cfg; for
details, see Viewing the Rapid NFS and Rapid CIFS Logs.
NOTE: If the client and server do not have the same times, the times seen will not match
typical NFS behavior due to the nature of file system in user space (FUSE).
Best Practices: Rapid CIFS
This topic introduces some recommended best practices for using Rapid CIFS operations with the DR Series system.
Containers must
be of type NFS/
CIFS RDA containers cannot use Rapid CIFS. If you have existing NFS/CIFS containers, you do not
need to create new containers to use Rapid CIFS; you can install the plug-in (driver) to existing
clients.
The Rapid CIFS
plug-in (driver)
must be installed
on client systems After the plug-in is installed, write operations will go through Rapid CIFS while metadata
operations such as file creates and permission changes will go through the standard CIFS
protocol. Rapid CIFS can be disabled by uninstalling the plug-in.
Your DR Series
system must
meet the
minimum
configuration Rapid CIFS is only available with a DR6000 system and a client with a minimum of 4 CPU cores
running at a minimum of 4 GHz cumulative processing power and 2 GB memory. For a list of
supported operating systems, see the
Dell DR Series System Interoperability Guide .
If you update your operating system, you must update your Rapid CIFS plug-in as well. Updates
are available on the Support site as well as within the GUI on the Clients page.
Rapid CIFS is
stateful If the DR Series system goes down, the connection will terminate. DMAs will restart from the
last checkpoint.
Rapid CIFS and
passthrough
mode If Rapid CIFS mode fails for any reason, the DR Series system falls back to regular CIFS mode
automatically. For details, see
Monitoring Performance .
Rapid CIFS
acceleration
constraints Rapid CIFS does not support:
• NAS functionality
– Optlocks (but supported if a single client is writing)
– Byte-range locks
• Optimization of very small files (less than 10 MB). File size can be adjusted using
configuration settings.
• FILE_NO_IMMEDIATE_BUFFERING and FILEWRITE_THROUGH operations (sent via CIFS
only).
• File path size greater than 4096 characters
Rapid CIFS starts accelerating only after 10 MB is sequentially written to files (tunable in 5MB
multiples). You can configure the file MIME types to go through acceleration in rdcifs.cfg.
133