HP StorageWorks XP Remote Web Console Software - Manual (Page 154)

154 Continuous Access XP Journal operations with NAS Blade
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.
Scope related to RAID Manager XP
• Relationships of failover and failback on RAID Manager XP and NAS Blade system
RAID Manager XP is not subject to failover and failback by the NAS Blade system. Prepare the same
configuration file as the main node in the standby node except for
ip_address
in the
HORCM_MON
section. If a failure occurs in the NAS package while RAID Manager XP is operating and failover
occurs, start RAID Manager XP in the standby side and continue operating Continuous Access XP
Journal.
• Protect feature
When using Continuous Access XP Journal in the NAS Blade system, you create and resynchronize
pairs using RAID Manager XP while the NAS Blade system does not recognize the S-VOL. Therefore,
you cannot use RAID Manager XP’s protection facility because this facility prohibits operations of
volume pairs the system does not recognize.
• Executing RAID Manager XP commands
To execute RAID Manager XP commands using the nasroot account for logging in to a NAS package
using SSH, use the
sudo
command as follows:
Figure 68 Executing the pairdisplay command in RAID Manager XP using the sudo command
Figure 69 Executing the pairdisplay command using a shell script created in the SSH Client (for SSH
protocol version 2)
$ sudo pairdisplay -gg VG01
$ ssh -2 [email protected] sudo pairdisplay -gg VG01