File_System_Migration

CDMS Overview
CDMS functionality
To start migrating data, you must establish network connectivity
from a VNX Data Mover to the existing source file servers containing
the NFS or CIFS protocol data. When adding the Data Mover to the
network, it can be assigned a new IP address, or it can assume the IP
address of the original file server. Prior to beginning the migration,
UNIX workstation or Windows client access must be shifted to the
VNX from the source file server. This task might require you to
rename the original source file server, and set the original source file
server name on the VNX. Then, you must mount the source file
server as a read-only file system (in other words, no allowed user
updates or deletes). Now the Data Mover assumes total I/O activity.
Figure 1 on page 36 shows the NFS logical (not physical) relationship
among the VNX, a source file server, and the network.
UNIX Workstations
Network
Figure 1 NFS configuration
Symmetrix
PS0 PS1 PS2 PS3 PS4 SMB0 SMB1
On read requests, the VNX acts as a server to the network and as a
client to the source file server. It only accesses the source file server if
the information being requested is not already on the VNX. On write
requests, the VNX accepts the new information that must be stored,
instead of the source file server. The Data Mover uses the NFS or CIFS
protocol to retrieve files and directories from the source file server in
the background as they are requested from clients.
36 VNX File System Migration Version 2.0 for NFS and CIFS User Guide 7.1
SB14
SB12
SB10
SB8
SB6
NFS/FTP NFS
SB4
SB2
SB0
VNX
SB15
SB13
SB11
SB9
SB7
SB5
SB3
SB1
Source File
Server
VNX-000051