IBM N3700 A20 Manual

Redpaper
© Copyright IBM Corp. 2007. All rights reserved. ibm.com/redbooks 1
IBM System Storage N3700 A20
Setup
In this IBM Redpaper, we discuss how to set up clustered systems, using IBM®
System Storage™ N3700 Model 2863-A20 as an example. This paper covers:
򐂰Hardware setup, such as cabling and connecting to local area networks
(LANs) and expansion shelves such as the System Storage EXN2000
expansion unit
򐂰Initial setup of the cluster nodes and cluster configuration
򐂰Disk ownership in a clustered environment
We start our planning and installation procedure after unpacking and mounting
the systems in the 19” rack.
Alex Osuna
Dirk Peitzmann

2IBM System Storage N3700 A20 Setup
Planning the implementation
Regardless of whether or not you are installing a single-node or clustered
systems environment, planning and preparation are of particular importance.
Planning and preparation save time during the installation and configuration and
often prevent problems. Gather information and plan before the systems are
installed. Remember, we do not discuss the physical planning and mounting the
appliances and expansions into racks in this IBM Redpaper. You can obtain more
information about those subjects in IBM System Storage N series N3700
Hardware and Service Guide, GA32-0515.
Disk ownership
A System Storage N series cluster consists of two nodes that are able to
takeover/failover their resources or services to the associated counterpart nodes.
This functionality assumes that all resources can be accessed by each node.
That means both nodes must have access to all disks physically (cabling) and
logically (cluster software). The N3700 Model A20 combines both cluster nodes
in one shelf.
Each disk has a preferred ownership and “stays” on the owner node until a
takeover occurs. Ownership can be either to Node A or Node B (Figure 1).
Figure 1 Example disk ownership of Node A and Node B
Shelf 2
Shelf 1
Ownership Node
Ownership Node
A B A B A B A
B A B A B A B
A A B B B A B
A A A B B B A

IBM System Storage N3700 A20 Setup 3
The following table (Table 1) shows a sample disk ownership.
Table 1 Disk ownership sample
Bay number
Disk shelf 1 131211109876543210
NodeAXXXXXXX
NodeBXXXXXXX
Disk shelf 2 131211109876543210
NodeAXXX XXX X
Node B X X X X X X X
Disk shelf 3 131211109876543210
NodeA--------------
NodeB--------------
X marks the node that owns the disk. A dash (-) means no disk in place.
Disks in bay 0 and 1 (shelf 1 and 2) are SCSI Enclosure Services (SES) disks.
Note: Disk ownership is changed after the initial setup, or after adding
additional disks. Use the disk assign command to change ownership, and the
storage disk show command to determine which node owns which disk.

4IBM System Storage N3700 A20 Setup
Check disk assignment after setup using the CLI command storage show disk,
or the Web interface FilerView →Storage →Manage. Figure 2 illustrates disks
in a sample clustered environment.
Figure 2 FilerView: Manage Disks
Setting up the hardware
Now, we describe the installation and setup of the System Storage N3700 Model
A20, the clustered storage system, and the attachment of the System Storage
EXN2000 expansion unit.
Tip: Plan the disk assignment carefully. Load balancing or active/passive
configurations can be reflected in the disk assignment procedure.
Tip: Check the interoperability matrix for supported configurations.

IBM System Storage N3700 A20 Setup 5
Tools and equipment
The N3700 Model A20 shipment package includes:
򐂰N3700 base unit (equipped with two CPU modules)
򐂰Power supplies
򐂰Power cords
򐂰Two console cables (RJ45-DB9) for a serial console
򐂰Fibre channel terminators
򐂰Publications
򐂰Setup kit
򐂰Software licenses
Before you install the hardware, make sure that you already have the appropriate
tools and equipment assembled to use (client-supplied items):
򐂰Flathead screwdriver, and #1 and #2 Phillips head screwdrivers
򐂰Pointed tool (to use for setting termination switches)
򐂰ASCII terminal, console (for example, a notebook computer or PC with serial
port)
򐂰Null modem cable (to connect to the console serial port)
򐂰Ethernet local area network (LAN) cables required for file serving network
򐂰Fibre channel cables for EXN2000 or tape connection (cables to EXN2000
included)
Refer to IBM System Storage N series N3700 Hardware and Service Guide,
GA32-0515, and Installation and Setup Instructions for an System Storage
N3700 and an EXN2000 Expansion Unit, GA32-0517, for more information while
mounting and installing the N3700 filer.
The N3700 Model A20
This section describes the hardware installation of the clustered N3700 Model
A20 storage system. First, we describe the components of the system.
Attention: The N3700 and EXN2000 use sensitive electronic components. To
avoid damage to them, wear an antistatic wrist strap and grounding leash for
the installation.
Note: The N3700 A20 provides two DB-9 to RJ-45 console adapters, one for
each CPU module. You can use this connection to connect a console to the
Filer. Remember to use a null modem cable.

6IBM System Storage N3700 A20 Setup
Components
The N3700 Model A20 filer ships with two power supplies (PSU1 and PSU2),
which are located on the back panel on the rightmost and leftmost sides of the
N3700 appliance. Each power supply has its own ac power cord.
The CPU module Node B is on the middle, bottom of the back panel, module
Node A on the middle, top of the shelf (Figure 3).
Figure 3 N3700 Model A20 back panel
Each of the CPU modules (Figure 4 on page 7) hosts several LEDs and ports.
The ports are:
򐂰Two Ethernet ports (green)
򐂰Console port (purple)
򐂰Two fibre channel ports:
– Fibre channel port 1 (optical, orange) is used for third-party devices (such
as tape for backup).
– Fibre channel port 2 (copper, blue) is used for connections to EXN2000
expansion modules.
Note: We recommend that you use independent, separate power sources.

IBM System Storage N3700 A20 Setup 7
The shelf ID switch and appliance and disk shelf loop switch are between the
CPU modules.
The illustration in Figure 4 shows the CPU module ports. Next, we describe
installing the N3700 cluster.
Figure 4 N3700 CPU module
Connections and cabling
After unpacking and mounting the N3700 and all EXN2000s in a 19” rack, we first
install the base unit (two CPU modules), and then we describe the attachment of
the EXN2000 units. Perform the following steps:
1. Make sure that the N3700 system and its EXN2000 units are turned off.
2. Set the shelf ID of the N3700 base unit to 1 (Figure 5).
Figure 5 Setting the shelf ID
Important: The power to N3700 must be turned off before changing the
shelf ID.

8IBM System Storage N3700 A20 Setup
3. Set the 1Gb/2Gb switch to the 1Gb position (Figure 6).
Figure 6 Setting the 1Gb/2Gb switch
4. Connect the Ethernet cable to the (green) Ethernet port in the middle of the
controller module’s Node A. Repeat this for Node B. See Figure 7 on page 9.
5. Connect the console cables (DB9-RJ45 converter) to the console port
(purple) from Node B and Node A on the back of the appliance (Figure 7 on
page 9). If you are attaching a third-party device, such as a tape backup or a
fibre channel switch, leave the fibre channel ports (orange ports)
un-terminated. Refer to “Connecting to third-party devices” in IBM System
Storage N series N3700 Hardware and Service Guide, GA32-0515, for
details.
1Gb/2Gb Switch

IBM System Storage N3700 A20 Setup 9
6. If no third-party device will be attached to the fibre channel ports (orange
ports), insert the fibre channel terminator or loopback terminator into the fibre
channel ports (orange ports) at the CPU modules (Node A and Node B)
(Figure 7).
Figure 7 Connecting Ethernet, console cables, and fibre channel terminator
7. If an EXN2000 disk shelf will not be attached, set the terminate switch on both
CPU modules (Node B and Node A) to ON (Figure 8).
Figure 8 No EXN2000 attached
If an EXN2000 will not be attached, proceed as follows (system is still off):
a. Plug in the power cord to the left and right power supplies.
b. Fasten the power cords with the hold-down clamps.
c. Plug the other ends of the power cords into the grounded ac power source.
d. Proceed with the initial setup in “Initial configuration” on page 13.

10 IBM System Storage N3700 A20 Setup
8. If you are connecting one or more EXN2000 disk shelves, set the terminate
switch on the CPU modules (Node B and Node A) to OFF (Figure 9).
Figure 9 EXN2000 attached
9. Proceed if you are connecting additional EXN2000 disk shelves. Otherwise,
go to “Initial configuration” on page 13.
If one or more EXN2000s will be attached, proceed as follows (remember,
during the initial hardware setup, the N3700 system is still turned off). Perform
the following steps (Figure 10 on page 11):
a. Confirm that the shelf ID of the base unit is set to 1.
b. Connect the fibre channel port (blue) of Node B (lower CPU module) to the
first EXN2000 disk shelf ESH2 module B (In port).
c. Connect the fibre channel port (blue) of Node A (upper CPU module) to
the first EXN2000 disk shelf ESH2 module A (In port).
d. Attach the grounding cable (EXN2000, base shelf).
Note: The N3700 supports hot plugging a disk shelf. Refer to IBM System
Storage N series N3700 Hardware and Service Guide, GA32-0515, for
details and restrictions.
Attention: The N3700 and the EXN2000 shelves use sensitive electronic
components. To avoid damaging them, put on an antistatic wrist strap and
grounding leash for the installation.

IBM System Storage N3700 A20 Setup 11
Figure 10 Connecting EXN2000 shelves
e. Set the EXN2000 shelf ID to 2 and set the disk shelf loop speed to 1 Gb.
f. If you attach only one EXN2000, plug in the power cord to the left and right
power supplies, fasten the power cords with the hold-down clamps, and
plug the other ends of the power cords into grounded ac power source.
Skip adding a second EXN2000 and proceed with the initial configuration.
g. If you are adding additional EXN2000 shelves, cable the EXN2000 (ID 2)
ESH2 Mod. B (Out port) to EXN2000 (ID 3) ESH2 Mod. B (In port) and
EXN2000 (ID 2) ESH2 Mod. A (Out port) to EXN2000 (ID 3) ESH2 Mod. A
(In port).

12 IBM System Storage N3700 A20 Setup
h. Attach the grounding cable (EXN2000 #1 and #2). See Figure 11.
Figure 11 Connecting additional EXN2000 shelves
i. Set the EXN2000 shelf ID (second EXN2000) to 3 and set the disk shelf
loop speed to 1 Gb.
j. Repeat the previous steps if a third EXN2000 will be attached.
k. Plug in the power cord to the left and right power supplies, fasten the
power cords with the hold-down clamps, and plug the other ends of the
power cords into grounded ac power source.
Base Unit
ID 3
ID2
(ID1)

IBM System Storage N3700 A20 Setup 13
Initial configuration
Next, we describe the initial configuration after booting the System Storage N
series filer for the first time. After turning on your system for the first time, run
diagnostics to make sure that it is functioning properly and to diagnose any
hardware problems.
N3700 initial setup
Ensure that the hardware setup of the N3700 is complete. Refer to “Setting up
the hardware” on page 4 for details about the hardware setup (shelf IDs, speed
settings, grounding, termination, and cabling).
The System Storage N series filer is shipped with a complete version of the
System Storage N series software. During the setup procedure, several files are
updated with the information provided during the configuration procedure.
These files are:
򐂰/etc/rc
򐂰/etc/exports
򐂰/etc/hosts
򐂰/etc/hosts.equiv
򐂰/etc/dgateways
򐂰/etc/nsswitch.conf
򐂰/etc/resolf.conf
Setup method
You can set up the system using various interfaces. You can use the serial
connection with a console PC for the very first configuration steps.
Console PC
Use the null modem cable to connect the console adapter cable of the N3700
node to the serial port of the console PC or notebook computer. Plug the console
adapter cable into the console port (purple) of the CPU module of the filer
(Figure 4 on page 7). Note the following console settings:
򐂰Baud: 9600
򐂰Data bit: 8
򐂰Parity: None
򐂰Stop Bits: 1
Note: Repeat the initial configuration on both nodes (Node A and Node B).

14 IBM System Storage N3700 A20 Setup
򐂰Flow control: None
Web browser
If DHCP is enabled, you can use a Telnet client for the setup. To keep the
installation simple, we skip this and continue with the console setup.
Turn on the N3700
Turn on the N3700 in the following order:
1. EXN2000 (expansion disk shelves)
2. N3700 appliance (base unit)
Setup and configuration
After the system is connected properly and turned on for the first time, the initial
setup starts with the basic filer settings. Enter the settings according to your
planning worksheets. The initial configuration must be done on both nodes.
Proceed with the following steps on Node A and Node B:
1. Enter your new host name: itso-n1
See the screens shown in Figure 12 on page 15 and Figure 13 on page 16 for
more details.
The initial setup starts automatically when the system is turned on for the first
time. The basic configuration depends on which licenses are installed on your
system before shipment.
The following screen captures might vary from your environment, depending
on which licenses are installed, the Data ONTAP® software level, and the
hardware you are using. For example, if you did not obtain a CIFS license, the
CIFS setup does not appear during the initial configuration.
Tip: The default spin-up time for all disks in the appliance is 60 seconds.
Reduce this spin-up time to 20 seconds by turning on the switches of both
power supplies within 5 seconds of each other.
Note: During the setup, you are asked to continue the configuration using
the Web interface. If you select No, the setup continues using the
command line interface. If you select Yes, you can use the Web interface
through the IP address that previously displayed.
You can leave the default time zone settings and then configure the time
zone after the initial configuration.

IBM System Storage N3700 A20 Setup 15
Figure 12 Initial setup: Host and network definitions

16 IBM System Storage N3700 A20 Setup
Figure 13 Initial setup: WINS, CIFS, and user authentication settings
Figure 14 Initial setup: Joining a Workgroup

IBM System Storage N3700 A20 Setup 17
2. After completing the initial setup procedure, we log on to the appliance:
login: root
password: <password_you_selected_during_setup>
3. Now we can start with disk management. First, we check the disk ownership.
Each cluster node must have one or two disks (SES disks). Verify the disk
information:
storage show disk or sysconfig -r
4. Then, we assign the disks to the N3700 controllers Node A and Node B. Make
sure you have your completed disk ownership worksheet.
disk assign 0b.NN
5. After assigning the disks to the nodes, verify that all disks are assigned to the
correct node with the sysconfig -r command (Figure 15).
Figure 15 Command line output: sysconfig -r

18 IBM System Storage N3700 A20 Setup
6. Verify the license settings and add missing or additional licenses. All licenses
you bought with the hardware should already be installed on the filer. Use the
following commands to show license information and add additional licenses
to your system. Cluster licenses must be set on both nodes. Use the following
commands to check the license settings on both storage systems and add
additional licenses to your system:
license
license add wwxxyyzz
7. Reboot the system:
reboot
8. Now we can enable the cluster on one node. The command is cluster-aware,
and you have to execute it only on one node (Figure 16):
cf enable
Figure 16 Command line: cf enable
9. Verify whether or not the cluster is enabled and that the other node is up and
running (Figure 17):
cf status
Figure 17 Command line: cf status
The cf monitor command provides more information about the cluster.
Figure 18 Command line: cf monitor
10.Issue the takeover test through the takeover option:
cf takeover
If the takeover was not successful, run the Cluster Configuration Checker for
N series NAS and iSCSI products at the following Web site and proceed as
directed:
http://www.ibm.com/storage/support/nas

IBM System Storage N3700 A20 Setup 19
11.Check the status of the appliance cluster again (Figure 19):
cf status
Figure 19 Cluster status after takeover
12.Then, bring the cluster back to its original state and check the status again:
cf giveback
cf status
The cluster should be cluster enabled and both nodes up (Figure 20).
Figure 20 Cluster status after giveback
Using a Web browser to complete the configuration
After successfully completing the setup, log on to the N3700 through your Web
browser. You can do this setup after you choose Continue with Web Setup
during the initial configuration. Repeat these steps for both cluster nodes.
Note: The counterpart of the node where you issued the cf takeover
command shuts down. To re-enable the node, issue the cf giveback
command.
Note: There might be restrictions for the Web administration of the storage
systems regarding browsers and Java™ versions. Currently, they are:
򐂰Netscape Navigator 4.51 or later.
򐂰Microsoft® Internet Explorer® 4.0 or later.
򐂰Java and JavaScript™ must be enabled.
򐂰Other browsers with Java/JavaScript might also work.
In addition to Microsoft Internet Explorer 6.0, we used the Mozilla Firefox
browser (Version 1.0.1).

20 IBM System Storage N3700 A20 Setup
You can use the Setup Wizard for additional configuration tasks. The following
step-by-step procedure describes this approach:
1. First, log on to the filer using the host name or IP address, as shown in
Figure 12 on page 15. Use the user “root” and password. Use the information
from your worksheets.
Use the following URL:
http://your_filername/na_admin/
Figure 21 System Storage N series Web logon process