Use Cray Dvs On Urika-Gx; Dvs Ioctl Interfaces - Cray Urika-GX Administration Manual

Administration of Cray DVS is very similar to configuring and mounting any Linux file system. For more
information, see the dvs(5) man page. Here is a system administrator's view of Cray DVS.
Figure 31. Cray DVS In a Cray System
Compute Compute
Nodes Nodes
DVS Client
DVS Client
HSN
DVS Server DVS Server
XIO
Node Node
GPFS Client Lustre Client
GPFS Lustre
Server Server
6.1.1

Use Cray DVS on Urika-GX

Cray has successfully experimented with connecting Urika-GX to GPFS and NFS filesystems via Cray DVS. For
more information and guidance, please contact Cray Support and visit
ka3330000008gb3.
Major Features of DVS
● DVS supports failover and failback for parallel modes. The topic describes how it works and includes example
console messages.
● DVS periodic sync promotes data and application resiliency and is more efficient than the DVS mount option
closesync. The topic describes how it works and how it can be tuned.
● DVS statistics enable analysis of DVS performance on client and server nodes in CLE. There are many per-
mount statistics available with this release.
● DVS can log requests sent to servers to aid in debugging. The topic shows an example log file and describes
how to enable, disable, and reset request logging.
● DVS lists outstanding client requests, including the DVS server node and the amount of time the request has
been waiting for a response.
6.1.2

DVS ioctl Interfaces

The following are provided for advanced users who require DVS ioctl interfaces. Most are correlates of
environment variable and mount options with the same name.
S3016
Compute
Cray System
Nodes
DVS Client
DVS Server
XIO
XIO
Node
NFS Client
NFS
Server
https://cray.my.salesforce.com/
Cray DVS
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