HP NetServer AA 4000 HP AA HP Netserver 4000 Reference Guide - Page 26

Rules for maintaining availability

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HP NetServer AA Rules for maintaining availability There really is only one rule when working with the HPAA system: Always maintain the highest level of availability. How is this done? Here are a few simple reminders to adhere to when working with or adminstrating the HPAA system: • Never shutdown the "server" with clients attached. • Anytime one IOP goes offline for any reason while the CEs are in operation, a disk re-mirror operation must take place after the IOP is brought back online. • To avoid unnecessary disk re-mirror operations, shutoff the CEs during planned maintenance activities. • One component can fail and the HPAA sytem still continues on as if no failure took place. However, a second failure of the same component generally means the HPAA system will be unavailable. • When changing, adding or deleting an IOPs AA 4000 configuration file, the same operation must be done on the other IOP. The changes do not take affect until the next server reboot. • The CEs are running the NT operating system that is used by the applications and client network, all changes that need to be made affecting these resources need tobe done on the CE, not the IOP. • Changes to the NT operating system on the CE may not take place until NT is rebooted (just like in a single server environment). Take the appropriate precautions before rebooting the CE's NT operating system. 1-20 Hewlett-Packard Company

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HP NetServer AA
Hewlett-Packard Company
1-20
Rules for maintaining availability
There really is only one rule when working with the HPAA system:
Always maintain the highest level of availability
.
How is this done?
Here are a few simple reminders to adhere to
when working with or adminstrating the HPAA system:
•
Never shutdown the “server” with clients attached.
•
Anytime one IOP goes offline for any reason while the CEs are
in operation, a disk re-mirror operation must take place after the
IOP is brought back online.
•
To avoid unnecessary disk re-mirror operations, shutoff the CEs
during planned maintenance activities.
•
One component can fail and the HPAA sytem still continues on
as if no failure took place.
However, a second failure of the
same component generally means the HPAA system will be
unavailable.
•
When changing, adding or deleting an IOPs AA 4000
configuration file, the same operation must be done on the other
IOP.
The changes do not take affect until the next server reboot.
•
The CEs are running the NT operating system that is used by the
applications and client network, all changes that need to be made
affecting these resources need tobe done on the CE, not the IOP.
•
Changes to the NT operating system on the CE may not take
place until NT is rebooted (just like in a single server
environment).
Take the appropriate precautions before rebooting
the CE’s NT operating system.