Hp XP Continuous Access Software Uživatelský manuál stáhnout pdf (Strana 266)

266 HP StorageWorks Disk Array XP RAID Manager: User’s Guide

horctakeover

(swap-takeover)

When executing horctakeover on a standby server manually, I/O

activity on the servers (for the pertinent CA volumes) must be stopped.

Host machines that can own

opposite sides of a CA pair

Host machines must be running the same operating system and the

same architecture.

New RM installations After a new host system has been constructed, a RM failure to start can

occur due to an improper environmental setting or an inaccurate

configuration definition file. Use the RM activation log file for RM

error definitions.

Host failure If a failure occurs on host A (with application failover software

installed), host

B detects the failure and issues a takeover command

making the secondary volumes usable. If the secondary volumes can

continue processing, host

B takes over processing from host A.

While host B continues to process (swap-takeover) the command, the

volumes are swapped so that the secondary volumes become the

primary volumes and the primary volumes become the secondary

volumes. When host

A has recovered from the failure, it can take back

ownership and control through another

swap-takeover command.

Secondary volume failure If the primary volume detects a failure in the secondary volume, pair

writing is suspended. The primary volume changes the paired volume

status to PSUE. (The fence level determines whether host

A continues

processing, that is, writing, or host

B takes over from host A.) RM

detects the change in status and sends a message to the syslog.

If host A had initiated a monitoring command, a message appears on

host

A. When the secondary volume recovers, host A updates the

S-VOL data by running the

pairsplit –S, paircreate –vl, or pairresync

command.

Startup failure When the P-VOL server boots up, the secondary volume can be

updated. If the secondary volume is used by the LVM, the volume

group of the LVM must be deactivated. The secondary volume must

only be mounted to a host when the volume is in PSUS state or in

SMPL mode. The secondary volume must not be mounted

automatically in any host boot sequence.

(continued)

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