HP XP Continuous Access Software - Manual (Page 185)

4. At the primary site, check the completion of the XP Continuous Access Journal volume pair
creation.
sudo pairvolchk {-g group-name|-d volume-name}
NOTE: You can also use the pairevtwait command, which waits for the volumes to be
paired.
pairvolchk: Volstat is P-VOL.[status = COPY] => Creating
pairvolchk: Volstat is P-VOL.[status = PAIR] => Created
Splitting XP Continuous Access Journal volume pairs
When splitting an XP Continuous Access Journal volume pair, you can choose either offline or
online backup. With offline backup, you can split the pair by unmounting the P-VOL. With online
backup, you can split the pair by temporarily saving updates to a file system without unmounting
the P-VOL.
During offline backup, an XP Continuous Access Journal volume pair is split after completely
stopping access from clients by deleting CIFS/NFS shares. Since I/O errors are reported to the
application if CIFS/NFS shares are deleted while the application writes data in the P-VOL or if the
application tries to write data in the P-VOL after deleting CIFS/NFS shares, it can be distinguished
by the application data reflected in the XP Continuous Access Journal volume pair. Therefore, it is
applicable to most applications.
During online backup, however, an XP Continuous Access Journal volume pair is split without
deleting CIFS/NFS shares. Since I/O errors are not reported to the application when writing data
to the P-VOL, it cannot be distinguished by which time data is reflected in the S-VOL. For this reason,
it is applicable only to the application that can identify where data was updated with a journal
file, and so on.
Offline backup
To split the XP Continuous Access Journal volume pair with offline backup:
1. At the primary site, stop the program that accesses the P-VOL.
2. At the primary site, delete NFS/CIFS shares in the P-VOL using the enas_nfsdelete and
enas_cifsdelete commands in NAS Blade Manager. Unmount the P-VOL using the
enas_fsumount command.
3. At the primary site, prevent NAS Sync Image from performing operations on the P-VOL:
sudo horc_pvol_freeze -f Source file system name
4. At the primary site, split the XP Continuous Access Journal volume pair.
sudo pairsplit {-g group-name |-d volume-name } -rw
5. At the primary site, verify that the XP Continuous Access Journal volume pair has been split.
sudo pairvolchk {-g group-name |-d volume-name }
NOTE: You can also use the pairevtwait command, which waits for the pair to be split
(PSUS).
pairvolchk: Volstat is P-VOL.[status = COPY] => Splitting
pairvolchk: Volstat is P-VOL.[status = PSUS] => Split completes
6. At the primary site, enable operations from NAS Sync Image on the P-VOL.
sudo horc_pvol_unfreeze -f Source file system name
Overview of XP Continuous Access Journal operations 185