Hp XP Continuous Access Software Instrukcja Użytkownika Pobierz pdf (Strona 203)

Splitting Cont

inuous Access XP Journal volume pairs

When splitting

a Continuous Access XP Journal volume pair, you can choose either ofﬂine or online

backup. With of

ﬂine backup, you can split the pair by unmounting the P-VOL. With online backup, you

can split the p

air by temporarily saving updates to a ﬁle system without unmounting the P-VOL.

During ofﬂine

backup, a Continuous Access XP Journal volume pair is split after completely stopping

access from cl

ients by deleting CIFS/NFS shares. Since I/O errors are reported to the application if

CIFS/NFS sha

res 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 Continuous Access XP Journal volume pair. Therefore, it is applicable to most applications.

During online backup, however, a Continuous Access XP 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 Continuous Access XP 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 Continuous Access XP Journal volume pair.

sudo pairsplit {-g group-name|-d volume-name}-rw

5. At the primary site, verify that the Continuous Access XP 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

7. At the primary site, mount the P-VOL using the enas_fsmount command in NAS Blade Manager, and

create CIFS/NFS shares using the enas_nfscreate and enas_cifscreate commands.

8. At the primary site, restart the program that accesses the P-VOL.

9. At the secondary site, connect the target ﬁle system to the NAS package.

•Non-LVM:

sudo horc_svol_import -f Target-ﬁle-system-name -d Device-ﬁle-number

•LVM:

sudo horc_svol_vmimport -f Target-ﬁle-system-name -d Device-ﬁle-number,...

10. At the secondary site, mount the S-VOL using the enas_fsmount command. Create a shared

directory using the enas_dircreate command, or change the attributes of a shared directory using

the enas_diredit command. Create CIFS/NFS shares using the enas_nfscreate and nas_cifscreate

commands.

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