5.
Verify
that
the
drive
channels
are
in
an
optimal
state.
Monitor
the
status
of
the
storage
subsystem
for
several
days
with
the
Storage
Manager
client
and
DS4000
storage
server
event
logs.
It
is
recommended
that
you
periodically
monitor
the
Read-Link
status
and
drive
channels
for
two
to
three
days
looking
for
any
excessive
increase
in
error
counts.
Use
the
Recovery
Guru
function
in
the
Storage
Manager
client
Subsystem
Management
window
for
information
on
how
to
fix
any
non-optimal
conditions.
In
addition,
you
can
also
manually
force
one
drive
loop/channel
in
the
redundant
drive
loop
to
be
upgraded
into
a
Degraded
state
in
the
Drive
Channel
(Summary)
window.
With
one
loop
in
a
Degraded
state,
monitor
the
error
counts
in
the
other
(Optimal)
drive
loop/channel
in
the
redundant
drive
loop
(for
20
minutes)
with
I/O
activity
present.
Then
set
the
Degraded
drive
loop/channel
back
into
Optimal
state.
Wait
at
least
20
minutes
and
repeat
the
process
for
the
other
drive
loop/channel
in
the
redundant
drive
loop
to
be
upgraded.
If
there
are
excessive
errors
counts
(in
the
tens
or
hundreds),
do
not
perform
the
ESM
upgrade
until
you
have
first
resolved
the
errors
using
the
drive
path
diagnostics
described
in
the
IBM
TotalStorage
DS4000
Problem
Determination
Guide
.
Attention:
Resolve
any
non-optimal
conditions
before
continuing
with
the
next
step.
6.
Disconnect
the
fibre
channel
cable
that
connects
the
right-hand
storage
server
controller
drive
port
to
the
first
storage
expansion
enclosure.
In
this
cable
is
shown
with
a
dashed
line
and
marked
1
.
Mark
the
cable
for
later
use.
You
will
not
reconnect
this
cable
until
you
have
replaced
all
the
ESMs
to
be
upgraded
in
the
disconnected
drive
loop.
1
Left ESM board
Input
Last expansion unit
First expansion unit
DS4300 Storage Server
with two RAID controllers
Second expansion unit
Loop B Fibre Channel
interface cable
Loop A Fibre Channel
interface cable
Output
Output
Right ESM board
Controller B drive port
Controller A drive port
Figure
60.
Disconnect
the
fibre
channel
cable
from
one
storage
server
to
the
first
EXP700
Appendix
B.
Upgrading
ESMs
with
the
DS4000
EXP700
Models
1RU/1RX
Switched-ESM
Option
Upgrade
Kit
89
Summary of Contents for TotalStorage DS4000 EXP710
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