IBM DS3500 Installation, User's, And Maintenance Manual page 136

insert the new drive. The data on the new drive is still rebuilt, but the process takes longer for each
drive. Remember to reassign the hot spares when you are finished with this procedure.
Attention: After you remove a drive, wait 70 seconds to allow the drive to spin down before you
replace or reseat the drive. Failure to do so might cause unpredictable results.
To replace the drives one at a time, complete the following steps:
1. Read the following information:
v "Replacing multiple drives" on page 5-17, particularly the paragraphs that explain the differences
between the two possible upgrade procedures
v Your software documentation about drive upgrades and installation
v The documentation that comes with the new drives
Read all precautionary notes, kit instructions, and other information. Kit instructions often contain
the most current information about the drives and their installation, plus upgrade or servicing
procedures. Compare the kit instructions with this procedure to determine whether you must
modify this procedure.
2. Use the Storage Manager software to check the status of the unit. Correct any problems that are
reported.
3. Back up the data in the arrays and logical drives that are configured, using the drives that you are
replacing.
Attention: When you handle static-sensitive devices, take precautions to avoid damage from static
electricity. For details about handling static-sensitive devices, see "Handling static-sensitive devices"
on page 2-3.
DANGER
Electrical voltage and current from power cables are hazardous. To avoid a shock hazard,
always place electrical equipment on dry, static-free level surfaces. Never turn on any electrical
equipment when there is evidence of fire, water, or structural damage.
4. Unpack the new drives. Set the drives on a dry, static-free level surface, away from magnetic fields.
Save the packing material and documentation in case you have to return the drives.
5. Use the Storage Manager software to make sure that the array that was defined using these drives is
in Optimal (not Degraded) state before you manually fail the first drive that you want to replace. If
the array is in a Degraded state, use the recovery procedures to bring the array into the optimal
state.
Make sure that:
v You fail only one drive
v The software status display shows a Failed status for the applicable drive
v The amber drive fault LED (on the front bezel below the drive) is lit
Attention: Removing the wrong drive can cause data loss. Make sure that you remove only the
failed drive. A lit drive fault LED indicates the failed drive.
If you remove an active drive accidentally, wait at least 70 seconds and then reinstall it. Because you
have failed two drives in a RAID array, the array might be marked as failed by the controller. This
array will not be available to the host for I/O. See the Storage Manager software for further recovery
instructions. Do not attempt to replace any drives until the array is brought back to Optimal state.
6. Use the procedures in "Replacing a hot-swap drive" on page 5-16 to remove the failed drive. Use the
procedures in "Installing a hard disk drive" on page 5-15 to install the new drives in the storage
subsystem.
The new drive automatically reconstructs the data after you install it in the drive bay.
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System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide