Scope related to continuous access xp journal – HP XP Continuous Access Software User Manual

Page 186

Advertising
background image

Figure 73 Using Continuous Access XP Journal in NAS Blade systems

Scope of Continuous Access XP Journal functions with NAS

Blade

Scope related to Continuous Access XP Journal

Volume type
You can use only user LUs as Continuous Access XP Journal primary data volumes (P VOLs) and

secondary data volumes (S VOLs) in a NAS Blade system. You cannot use NAS system LUs (NAS OS

LU, Cluster Management LU, and dump LU) as Continuous Access XP Journal P-VOLs or S-VOLs.

Platforms that can access Continuous Access XP Journal P-VOLs or S-VOLs
Only clients connected to a network via Hitachi Network Attached Storage products or a NAS

Blade can access Continuous Access XP P-VOLs and S-VOLs created in a NAS Blade system. Hosts

connected via serial or Fibre Channel ports cannot access them.

File systems that can be allocated in Continuous Access XP Journal P-VOLs
You cannot allocate a file system consisting of 129 or more LUs and using Logical Volume Manager

(LVM) on the NAS OS.
You cannot allocate a volume group consisting of 129 or more LUs if it contains a file system managed

by NAS Sync Image and differential-data storage devices.

Writing data to an S-VOL when a volume pair is split
When splitting a Continuous Access XP Journal volume pair in the NAS Blade system, change the

S-VOL to write-enable. Ensure that you always specify the -rw option instead of the -r option when

issuing the RAID Manager XP pairsplit command.
To protect data in the split S-VOL from being written to by the client, use the enas_fsmount command

with the -r option in NAS Blade Manager when mounting the file system in the S-VOL.

Path settings
If you use a NAS Blade system with Continuous Access XP Journal, you must add paths to ports on

both CL1 and CL2 to connect the primary and secondary sites.

186

Continuous Access XP Journal operations with NAS Blade

Advertising
This manual is related to the following products: