HP XP Continuous Access Software - Manual (Page 186)

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