IBM 17011RS Maintenance Manual - Page 57

Replacing, cache, battery, controller

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For example, system date 14:23:05@09/09/05 17. Enter save to save the modified settings for the Telnet session. 18. Use the ServeRAID Manager program to monitor the status of the storage subsystem. Replacing the cache battery in the RAID controller Note: The iSCSI RAID controller in the DS300 model 1701-1RL does not contain a cache battery. Each RAID controller contains a rechargeable battery that maintains the data in the cache memory for three days without power to the unit. If the ServeRAID Manager program instructs you to replace the battery because the current battery has failed or is nearing its expiration date, complete the following steps to replace the battery. You can also use the ServeRAID Manager program to check the status of the battery. Attention: For storage subsystems with only one controller installed: To prevent data loss, you must shut down the system before you replace the RAID controller battery. 1. Read the safety information beginning on page "Safety" on page iii and "Installation guidelines" on page 35. 2. Label each cable that is connected to the RAID controller so that you can correctly reconnect it to the RAID controller after you replace the battery. 3. For a storage subsystem with only one controller installed: Stop the host I/O data to the storage subsystem. 4. For storage subsystems with two controllers installed: Move the I/O data to the alternate controller: a. Open a Telnet session and connect to the alternate controller management port IP address. b. At the command prompt, enter admin. c. Enter the administrator password. d. Enter controller peer disable. The controller that you are removing will shut down and all I/O data will have moved to the alternate controller. 5. If you are not using write-cache mirroring, you might have to clear cache memory on the RAID controller that contains the battery that has failed. To clear the cache, either shut down the controller before removing it from the storage subsystem or turn off caching in the storage subsystem by using the ServeRAID Manager program. Follow the steps in the ServeRAID Manager program before you continue with this procedure. 6. For a storage subsystem with one controller installed: Turn off the power-supply switches on the rear of the storage subsystem. 7. Remove the Ethernet cables from the RAID controller. 8. For a Fibre Channel RAID controller only: Remove the fiber-optic cables and the SFP modules from the RAID controller. For more information, refer to the ″Hardware Installation and User's Guide″. 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 35 Appendix A. Installing and replacing components 43

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For
example,
system
date
14:23:05@09/09/05
17.
Enter
save
to
save
the
modified
settings
for
the
Telnet
session.
18.
Use
the
ServeRAID
Manager
program
to
monitor
the
status
of
the
storage
subsystem.
Replacing
the
cache
battery
in
the
RAID
controller
Note:
The
iSCSI
RAID
controller
in
the
DS300
model
1701-1RL
does
not
contain
a
cache
battery.
Each
RAID
controller
contains
a
rechargeable
battery
that
maintains
the
data
in
the
cache
memory
for
three
days
without
power
to
the
unit.
If
the
ServeRAID
Manager
program
instructs
you
to
replace
the
battery
because
the
current
battery
has
failed
or
is
nearing
its
expiration
date,
complete
the
following
steps
to
replace
the
battery.
You
can
also
use
the
ServeRAID
Manager
program
to
check
the
status
of
the
battery.
Attention:
For
storage
subsystems
with
only
one
controller
installed:
To
prevent
data
loss,
you
must
shut
down
the
system
before
you
replace
the
RAID
controller
battery.
1.
Read
the
safety
information
beginning
on
page
“Safety”
on
page
iii
and
“Installation
guidelines”
on
page
35.
2.
Label
each
cable
that
is
connected
to
the
RAID
controller
so
that
you
can
correctly
reconnect
it
to
the
RAID
controller
after
you
replace
the
battery.
3.
For
a
storage
subsystem
with
only
one
controller
installed:
Stop
the
host
I/O
data
to
the
storage
subsystem.
4.
For
storage
subsystems
with
two
controllers
installed:
Move
the
I/O
data
to
the
alternate
controller:
a.
Open
a
Telnet
session
and
connect
to
the
alternate
controller
management
port
IP
address.
b.
At
the
command
prompt,
enter
admin
.
c.
Enter
the
administrator
password.
d.
Enter
controller
peer
disable
.
The
controller
that
you
are
removing
will
shut
down
and
all
I/O
data
will
have
moved
to
the
alternate
controller.
5.
If
you
are
not
using
write-cache
mirroring,
you
might
have
to
clear
cache
memory
on
the
RAID
controller
that
contains
the
battery
that
has
failed.
To
clear
the
cache,
either
shut
down
the
controller
before
removing
it
from
the
storage
subsystem
or
turn
off
caching
in
the
storage
subsystem
by
using
the
ServeRAID
Manager
program.
Follow
the
steps
in
the
ServeRAID
Manager
program
before
you
continue
with
this
procedure.
6.
For
a
storage
subsystem
with
one
controller
installed:
Turn
off
the
power-supply
switches
on
the
rear
of
the
storage
subsystem.
7.
Remove
the
Ethernet
cables
from
the
RAID
controller.
8.
For
a
Fibre
Channel
RAID
controller
only:
Remove
the
fiber-optic
cables
and
the
SFP
modules
from
the
RAID
controller.
For
more
information,
refer
to
the
″
Hardware
Installation
and
User’s
Guide
″
.
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
35
Appendix
A.
Installing
and
replacing
components
43