HP AD510A HP StorageWorks 1500 Modular Smart Array Installation Guide (355901- - Page 28

HP StorageWorks 1500 Modular Smart Array, Maintenance and Service, Guide, failed

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Installation Procedures - All Deployments - Manual load balancing-Through the ACU or the CLI, indicate the preferred path (controller ownership) for each LUN. This method is recommended for environments that are load balancing from the host. ■ In dual-controller multipath configurations (both active/active and active/passive), you must install some management software (such as multipathing software, management/monitoring utilities, and array configuration software) on each server with access to the MSA. ■ In operational environments, schedule physical configuration changes during periods of low or no activity. For example, if the system is performing rebuilds, RAID migrations, array expansions, logical disk extensions, or experiencing heavy I/O, avoid physical changes such as adding or replacing disk drives, or hot-plugging a controller or any other component. Hot adding or replacing a controller while under heavy I/O may cause a momentary pause, performance decrease, or loss of access to the MSA while the new controller is starting up. When the controller completes the startup process, full functionality is restored. ■ When servicing the controller in a single-controller MSA, do the following: a. Ensure that a known, good backup is available. b. Schedule a maintenance window. c. From the servers, stop all access to the MSA. d. Power off the MSA and disconnect the power cords. e. Remove the controller for servicing or replacement. Note: After completing the service and re-applying power to the MSA, if necessary, restart the server to rediscover the connection to the MSA controller. For more information, see the HP StorageWorks 1500 Modular Smart Array Maintenance and Service Guide, available on the Technical documents page of the MSA1500 website: http://www.hp.com/go/msa1500cs. ■ When servicing one (or both) controllers in a dual-controller MSA, do the following: If one of the two controllers is marked as failed, remove the failed controller for servicing or replacement at any time. 28 HP StorageWorks 1500 Modular Smart Array Installation Guide

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Installation Procedures - All Deployments
28
HP StorageWorks 1500 Modular Smart Array Installation Guide
—
Manual load balancing—Through the ACU or the CLI, indicate the
preferred path (controller ownership) for each LUN. This method is
recommended for environments that are load balancing from the host.
■
In dual-controller multipath configurations (both active/active and
active/passive), you must install some management software (such as
multipathing software, management/monitoring utilities, and array
configuration software) on each server with access to the MSA.
■
In operational environments, schedule physical configuration changes during
periods of low or no activity. For example, if the system is performing
rebuilds, RAID migrations, array expansions, logical disk extensions, or
experiencing heavy I/O, avoid physical changes such as adding or replacing
disk drives, or hot-plugging a controller or any other component. Hot adding
or replacing a controller while under heavy I/O may cause a momentary
pause, performance decrease, or loss of access to the MSA while the new
controller is starting up. When the controller completes the startup process,
full functionality is restored.
■
When servicing the controller in a single-controller MSA, do the following:
a.
Ensure that a known, good backup is available.
b.
Schedule a maintenance window.
c.
From the servers, stop all access to the MSA.
d.
Power off the MSA and disconnect the power cords.
e.
Remove the controller for servicing or replacement.
Note:
After completing the service and re-applying power to the MSA, if necessary,
restart the server to rediscover the connection to the MSA controller.
For more information, see the
HP StorageWorks 1500 Modular Smart Array
Maintenance and Service
Guide
, available on the Technical documents page
of the MSA1500 website:
.
■
When servicing one (or both) controllers in a dual-controller MSA, do the
following:
If
one
of the two controllers is marked as
failed
, remove the failed controller
for servicing or replacement at any time.