Table of Contents
Advertisement
Bringing storage subsystems and drive loops into optimal state
You can add or migrate storage enclosures only while the storage subsystem is
turned on and in optimal state. To bring storage subsystems and drive loops into
optimal state, complete the following steps:
1. Bring the storage subsystem to Optimal state before you reconfigure it with
2. Use the DS Storage Manager Client program to display the status of the storage
3. Verify that all indicator lights on the storage subsystem are in Optimal state.
4. Use the Read_Link_Status function of the DS Storage Manager Client program
5. If the arrays are in degraded state because of a failed drive, correct the problem
Note: If necessary, contact IBM support for assistance with event log
interpretation.
Before you add drives or storage enclosures, verify that the storage subsystem is
not performing any of the following tasks:
v Dynamic logical drive capacity expansion
v Logical drive segment size modification
v Array RAID-level modification
v User-initiated array redundancy checking (click Array > Check Redundancy in
v Remote mirror logical drive synchronization
v FlashCopy
v Logical drive reconstruction or copyback (logical drive sparing)
Intermixing storage enclosures
This section describes general information about intermixing storage enclosures in
a storage subsystem. Use the information in this section to plan a storage
subsystem migration or to add hard disk drives.
For the DCS3700 with Gen2 Controllers, IBM supports the DCS3700 storage
expansion enclosure. For the DCS3860 storage subsystem, IBM supports both the
EXP3800 and DCS3700 storage expansion enclosures.
When you increase the capacity of your storage subsystem in either of these ways,
you might choose to add external drive enclosures of the same model and type or
of different types. IBM does not support the combination of every external drive
new hardware.
subsystem and to correct any problems that might cause the storage subsystem
to enter Needs Attention state.
and the storage subsystem MEL to verify that all components in the drive loop
are in Optimal state. (Optimal state indicates that there are no drive loop
component errors in the event log and no errors in the Read_Link_Status
window.) Use the drive channel diagnostics to determine whether the drive
loop/channel is in Optimal state. For more information about the RLS and
drive channel diagnostics if they are supported by the installed version of your
controller firmware, see the Subsystem Management window online help of the
DS Storage Manager Client program.
before migration.
– Dynamic logical drive expansion (DVE)
– Dynamic capacity expansion (DCE)
the Storage Subsystem Management window)
®
or VolumeCopy logical drive creation
Chapter 1. Prerequisites to adding capacity and hard disk drive migration
11
Advertisement
Table of Contents
