Replacing The Drives One At A Time - IBM DS3500 Installation, User's, And Maintenance Manual

c. Make sure that the green cache active LEDs are off. See "Controller LEDs" on page 4-9 for the
location of the cache active LEDs.
d. If applicable, use the operating-system software to disconnect the storage subsystem logical
drives from the host before you power-off the storage subsystem.
Attention: To turn off all power to the storage subsystem, you must turn off both power-supply
switches and disconnect both power cords. Use the procedure in step 6 for the correct shutdown
sequence.
6. Turn off the power to each device according to the following shutdown sequence:
a. Turn off power to the host before you turn off power to the storage subsystem. If the host must
stay powered-on to support a network, see the operating-system documentation for information
about disconnecting the storage subsystem logical drives from the host before the storage
subsystem is powered-off.
b. Turn off power to the storage subsystem before you turn off power to the storage enclosures.
Turn off both power-supply switches on the rear of the storage subsystem.
c. Turn off power to other supporting devices (for example, management stations or Ethernet
switches).
7. Use the procedures in "Replacing a hot-swap drive" on page 5-16 to remove the drives that you
want to replace. Use the procedures in "Installing a hard disk drive" on page 5-15 to install the new
drives in the storage subsystem.
8. After you install all the new drives, check the system documentation for the hardware devices that
you intend to power-on, and then determine the correct startup sequence. Use the following
power-on sequence, where applicable:
a. Turn on the power to the supporting devices (for example, Ethernet switches and management
stations) before you turn off power to the storage subsystem.
b. Turn on the storage enclosures before the storage subsystem. The controllers might not recognize
the correct configuration if the drives are powered-on after the storage subsystem. For
instructions for powering-on the storage subsystem, see the storage subsystem documentation.
c. Turn on the power to the storage subsystem; then, restart or turn on the power to the host.
9. Turn on the power to each device, according to the power-on sequence in step 8. To turn on power
to the storage subsystem and the storage enclosures, turn on the power-supply switches on the rear
of the storage subsystem. You must turn on both power-supply switches to take advantage of the
redundant power supplies.
10. Check the green drive activity LEDs and the amber drive fault LEDs above the new drives.
Make sure that the drive activity LEDs are lit and the drive fault LEDs are off.
Note: The drive fault LEDs might flash intermittently while the drives spin up.
v If a drive activity LED is off, the drive might not be installed correctly. Remove the drive, wait 70
seconds, and then reinstall it.
v If the drive fault LED stays lit or the drive activity LED stays off, the new drive might be faulty.
See the Storage Manager software for problem determination.
11. Use the Storage Manager software to configure the new drives. See the Storage Manager software
online help for detailed instructions.
12. Restore the data from backup to all the drives.

Replacing the drives one at a time

Use this procedure to replace all the drives one at a time. You cannot use this procedure on RAID 0
logical drives (use the procedure in "Replacing all drives at the same time" on page 5-18).
Note: If hot spares are assigned in the storage subsystem, you might want to unassign the hot spares
while you perform this procedure. If you do not, reconstruction might start on the hot spare before you
Chapter 5. Replacing components
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