IBM 17011RS Maintenance Manual - Page 26

Cache, memory, controller, battery, Diagnostics, Monitoring, status, through, software, Using,

Get IBM 17011RS - TotalStorage DS300 Model NAS Server PDF manuals and user guides
UPC - 000435304971
View all IBM 17011RS manuals
Add to My Manuals
Save this manual to your list of manuals

Page 26 highlights

ETH 2 connector The ETH 2 connector is for iSCSI data transfer. Cache memory and RAID controller battery Each RAID controller contains 256 MB of cache memory. It also contains a sealed, rechargeable lithium ion battery that maintains data in the cache for up to three days in the event of a power failure. The service life of the battery is 36 months, after which time the battery should be replaced. For information about replacing the battery, see "Replacing the cache battery in the RAID controller" on page 43. Diagnostics To diagnose problems on the DS300 storage subsystem type 1701 (models 1RL, 1RS, 2RD), use the following diagnostic tools: v ServeRAID Manager software v LEDs and the "Symptom-to-FRU index" on page 13 For additional help when diagnosing problems with the DS400 storage subsystem, refer to the DS300 and DS400 Problem Determination Guides. Monitoring status through software Use the ServeRAID Manager program to monitor the status of the storage subsystem. Run the software constantly, and check it frequently. ServeRAID Manager provides the best way to diagnose and repair storage subsystem failures. The software can help you: v Determine the nature of the failure v Locate the failed component v Determine the recovery procedures to repair the failure For example, the recovery procedure for an IBM Predictive Failure Analysis® (PFA) flag (impending drive failure) on a drive varies depending on the drive status (hot spare, unassigned, RAID level, current logical drive status, and so on). Depending on the circumstances, a PFA flag on a drive can indicate a high risk of data loss (if the drive is in a RAID 0 volume) or a minimal risk (if the drive is unassigned). Only the ServeRAID Manager software can identify the risk level and provide the necessary recovery procedures. Note: For PFA flags, the General-system-error LED and Drive fault LEDs do not turn on, so checking the LEDs will not notify you of the failure, even if the risk of data loss is high. Recovering from a storage subsystem failure might require you to perform procedures other than replacing the component (such as backing up the logical drive or failing a drive before you remove it). The ServeRAID Manager software gives these procedures. Attention: You might lose data if you do not follow the software recovery procedures. Using the diagnostic hardware A wrap-plug can be ordered as a IBM CRU option (Part Number 00G2380). The wrap-plug is used to perform the wrap test and to identify ethernet path problems. 12 IBM TotalStorage DS300 and DS400: Hardware Maintenance Manual

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
ETH
2
connector
The
ETH
2
connector
is
for
iSCSI
data
transfer.
Cache
memory
and
RAID
controller
battery
Each
RAID
controller
contains
256
MB
of
cache
memory.
It
also
contains
a
sealed,
rechargeable
lithium
ion
battery
that
maintains
data
in
the
cache
for
up
to
three
days
in
the
event
of
a
power
failure.
The
service
life
of
the
battery
is
36
months,
after
which
time
the
battery
should
be
replaced.
For
information
about
replacing
the
battery,
see
“Replacing
the
cache
battery
in
the
RAID
controller”
on
page
43.
Diagnostics
To
diagnose
problems
on
the
DS300
storage
subsystem
type
1701
(models
1RL,
1RS,
2RD),
use
the
following
diagnostic
tools:
v
ServeRAID
Manager
software
v
LEDs
and
the
“Symptom-to-FRU
index”
on
page
13
For
additional
help
when
diagnosing
problems
with
the
DS400
storage
subsystem,
refer
to
the
DS300
and
DS400
Problem
Determination
Guides
.
Monitoring
status
through
software
Use
the
ServeRAID
Manager
program
to
monitor
the
status
of
the
storage
subsystem.
Run
the
software
constantly,
and
check
it
frequently.
ServeRAID
Manager
provides
the
best
way
to
diagnose
and
repair
storage
subsystem
failures.
The
software
can
help
you:
v
Determine
the
nature
of
the
failure
v
Locate
the
failed
component
v
Determine
the
recovery
procedures
to
repair
the
failure
For
example,
the
recovery
procedure
for
an
IBM
Predictive
Failure
Analysis
®
(PFA)
flag
(impending
drive
failure)
on
a
drive
varies
depending
on
the
drive
status
(hot
spare,
unassigned,
RAID
level,
current
logical
drive
status,
and
so
on).
Depending
on
the
circumstances,
a
PFA
flag
on
a
drive
can
indicate
a
high
risk
of
data
loss
(if
the
drive
is
in
a
RAID
0
volume)
or
a
minimal
risk
(if
the
drive
is
unassigned).
Only
the
ServeRAID
Manager
software
can
identify
the
risk
level
and
provide
the
necessary
recovery
procedures.
Note:
For
PFA
flags,
the
General-system-error
LED
and
Drive
fault
LEDs
do
not
turn
on,
so
checking
the
LEDs
will
not
notify
you
of
the
failure,
even
if
the
risk
of
data
loss
is
high.
Recovering
from
a
storage
subsystem
failure
might
require
you
to
perform
procedures
other
than
replacing
the
component
(such
as
backing
up
the
logical
drive
or
failing
a
drive
before
you
remove
it).
The
ServeRAID
Manager
software
gives
these
procedures.
Attention:
You
might
lose
data
if
you
do
not
follow
the
software
recovery
procedures.
Using
the
diagnostic
hardware
A
wrap-plug
can
be
ordered
as
a
IBM
CRU
option
(Part
Number
00G2380).
The
wrap-plug
is
used
to
perform
the
wrap
test
and
to
identify
ethernet
path
problems.
12
IBM
TotalStorage
DS300
and
DS400:
Hardware
Maintenance
Manual