Seagate ST39175LW Anleitung zur Fehlerbehebung PDF herunterladen (Seite 123)

Chapter 7, Extended Frozen Image Services (Array Integration Option) 109

Configuring Primary and Secondary Disks

paircreate -g wiltest -d dev3 -vl

2. Enter the following to view the result:

pairdisplay -g wiltest -d dev3 -CLI -fc

When the synchronization starts, the Status column reads COPY. When it is nearly

completed, the Status column reads PAIR (see the % column for percentage

completion).

If disks are paired but need to be split or reconfigured:

1. To split the secondary disk from the primary but maintain the pair association, enter

the following:

pairsplit -g groupname -d dev_name

where groupname is the name listed under dev_group, and dev_name is the device

name, as defined in the configuration files. The pairdisplay command will show a

status of PSUS and SSUS.

For example:

pairsplit -g wiltest -d dev1

This splits the secondary from the primary in the dev1 pair.

2. To split the secondary disk from the primary and remove the pair association between

them, enter the following:

pairsplit -g groupname -d dev_name -S

where -S means break the pair association. The pairdisplay command will show

SMPL in the P/S column for the affected disks, meaning the disks are no longer

paired.

For more information on array configuration, refer to the documentation provided by

the array’s vendor.

Selecting a Mirror Disk for the Backup

On Hitachi and HP disk arrays, each primary disk can have up to three secondary

(mirror) disks. These are devices 0, 1, and 2. For backups configured with the

ShadowImage or BusinessCopy frozen image method, you have the option of selecting

which of the three mirror disks will contain the frozen image. (The default is mirror disk

0.) Unless your site has special requirements for particular mirror disks, the default

should be acceptable (see following note).

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Seagate ST39175LW Anleitung zur Fehlerbehebung Seite 123