Scope related to continuous access xp journal – HP XP Continuous Access Software User Manual
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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
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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.
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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.
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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.
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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.
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Continuous Access XP Journal operations with NAS Blade