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1 - Dell EMC Isilon Customer Troubleshooting Guide: Troubleshoot Your SmartConnect Configuration For links to all Isilon customer troubleshooting guides, visit the Customer Troubleshooting - Isilon Info Hub. We appreciate your help in improving this document. Submit your feedback at http://bit.ly/isi-docfeedback. _________________ ___________________________ Abstract This guide will help you to troubleshoot the following scenarios: You are unable to connect to the SmartConnect name. The SmartConnect name resolves to an incorrect IP address. September 8, 2017 EMC ISILON CUSTOMER TROUBLESHOOTING GUIDE TROUBLESHOOT YOUR SMARTCONNECT CONFIGURATION OneFS 7.1.0 – 8.1.0

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Page 1: TROUBLESHOOT YOUR SMARTCONNECT … - Dell EMC Isilon Customer Troubleshooting Guide: Troubleshoot Your SmartConnect Configuration For links to all Isilon customer troubleshooting guides,

1 - Dell EMC Isilon Customer Troubleshooting Guide: Troubleshoot Your SmartConnect

Configuration

For links to all Isilon customer troubleshooting guides, visit the Customer Troubleshooting - Isilon Info Hub.

We appreciate your help in improving this document. Submit your feedback at http://bit.ly/isi-docfeedback.____________________________________________

Abstract

This guide will help you to troubleshoot the following scenarios: You are unable to connect to the SmartConnect name. The SmartConnect name resolves to an incorrect IP address.

September 8, 2017

EMC ISILON CUSTOMER TROUBLESHOOTING GUIDE

TROUBLESHOOT YOUR SMARTCONNECT CONFIGURATION

OneFS 7.1.0 – 8.1.0

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2 - Dell EMC Isilon Customer Troubleshooting Guide: Troubleshoot Your SmartConnect

Configuration

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We appreciate your help in improving this document. Submit your feedback at http://bit.ly/isi-docfeedback.____________________________________________

Contents and overview

Before you begin

Page 3

Appendix A

If you need further assistance

Start troubleshooting

Page 4

SmartConnect setup

Page 13

Packet capture

Page 17

Note Follow all of these steps, in order, until you reach a resolution.

1. Follow these

steps.

2. Perform

troubleshooting

steps in order.

3. Appendixes

Appendix B

How to use this flowchart

Appendix C

Example output isi network pools

Appendix D

Example output nslookup

Appendix E

Example output ifconfig /all

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Configure logging through SSH

We recommend that you configure screen logging to log all session input and output during your troubleshooting session.

This log file can be shared with EMC Isilon Technical Support if you require assistance at any point during troubleshooting.

Note: The screen session capability does not work in OneFS 7.1.0.6 and 7.1.1.2. If you are running either of these versions,

configure logging by using your local SSH client's logging feature.

1. Open an SSH connection to the cluster and log in by using the root account.

Note: If the cluster is in compliance mode, use the compadmin account to log in. All compadmin commands must be

preceded by the sudo prefix.

2. Change the directory to /ifs/data/Isilon_Support by running the following command:

cd /ifs/data/Isilon_Support

3. Run the following command to capture all input and output from the session:

screen -L

This will create a file named screenlog.0 that will be appended to during your session.

4. Perform troubleshooting.

Before you begin

CAUTION!If the node, subnet, or pool that you are working on goes down during the course of

troubleshooting and you do not have any other way to connect to the cluster, you could

experience data unavailability.

Therefore, make sure that you have more than one way to connect to the cluster before

you start this troubleshooting process. The best method is to have a serial cable

available. This way, if you are unable to connect through the network, you will still be

able to connect to the cluster physically.

For specific requirements and instructions for making a physical connection to the

cluster, see article 304071 on the EMC Online Support site.

Before you begin troubleshooting, confirm that you can connect either through another

subnet or pool, or that you have physical access to the cluster.

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Start troubleshooting

Go to Page 5

Start

IntroductionStart troubleshooting here. If you need

help to understand the flowchart

conventions used in this guide, see

Appendix B: How to use this flowchart.

If you have not done so already, log in to

the cluster and configure screen logging

through SSH, as described on page 3.

Verify that the DNSIQ process is running by running the following command

from the node where the SmartConnect service IP (SSIP) address resides:

ps -awux | grep isi_dnsiq_d | grep -v grep

If the DNSIQ process is running, the command returns output similar to the

output displayed in the example at the bottom of this page. If the DNSIQ is not

running, the command returns no output.

Example ps -awux | grep isi_dnsiq_d | grep -v grep output

root 3384 0.0 0.5 54692 5044 ?? Ss 8:47AM 0:00.31 /usr/sbin/isi_dnsiq_d

Is the DNSIQ

process running?Yes

No

Go to Page 6

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SmartConnect configuration

Page

5

You could have arrived here from:

Page 4 - Start troubleshooting

Verify that the SmartConnect service is enabled by

running the following command:

isi services -a isi_smartconnect

Is the

SmartConnect

service

enabled?

Note the page number that you

are currently on.

Upload log files and contact Isilon Technical

Support, as instructed in Appendix A.

Yes

Enable the SmartConnect service by running the

following command:

isi services -a isi_smartconnect enable

No

Go to Page 6

Yes

Is the

SmartConnect

service now

enabled?

Verify that the SmartConnect service is now

enabled by running the following command:

isi services -a isi_smartconnect

No

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SmartConnect configuration (2)

You could have arrived here from:

Page 4 - Start troubleshooting

Page 5 - SmartConnect configuration

Identify the SSIP address for the specific subnet you are using by running the

following command:

OneFS 8.0 and later

isi network subnets list

OneFS 7.2 and earlier

isi networks list subnets

See the examples at the bottom of this page for example output.

Copy the output to a text file for reference later in the troubleshooting process.

Page

6

Go to Page 7

Find your SmartConnect Zone name by running the following command:

OneFS 8.0 and later

isi network pools list -v

OneFS 7.2 and earlier

isi networks list pools -v

See Appendix C for example output.

________________________

______________________________

OneFS 8.0 and later

Example isi network subnet list output

ID Subnet Gateway|Priority Pools SC Service

-----------------------------------------------------------------------

groupnet0.subnet0 192.168.228.0/24 192.168.228.2|1 pool1 192.168.228.3

OneFS 7.2 and earlier

Example isi networks list subnet output

Name Subnet Gateway:Prio SC Service Pools

--------------- ------------------ ------------------ --------------- -----

subnet0 192.168.228.0/24 192.168.228.2:1 192.168.228.3 1

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SmartConnect configuration (3)

From the client, attempt to resolve the cluster name to an IP address by

running the following command, where <sczone> is the SmartConnect zone

name:

nslookup <sczone>

See Appendix D for example output and explanation of what to look for.

Page

7

Do the commands

return an IP address as

shown in the examples in

Appendix D?

Go to Page 12

Go to Page 8

Yes

No

You could have arrived here from:

Page 6 - SmartConnect configuration (2)

From the client, attempt to resolve the cluster name to an IP address by

running the following command, where <SC_FQDN> is the fully qualified

domain name (FQDN) for the SmartConnect zone:

nslookup <SC_FQDN>

See Appendix D for example output and explanation of what to look for.

Note These two commands should

return similar output, but both

should return an IP address

that resides on the cluster.

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SmartConnect configuration (4)

Page

8 You could have arrived here from:

Page 7 - SmartConnect configuration (3)

Does the

returned IP address

reside on the

cluster?

Go to Page 11

Go to Page 9No

Yes

No

Did the

nslookup query resolve

to the SSIP

address?

Go to Page 13Yes

Determine whether the returned IP address resides on the cluster by

running the following command, where <returnedIP> is the IP

address that was returned:

isi_for_array -l "ifconfig | grep <returnedIP>"

See example output at the bottom of this page.

Example isi_for_array -l "ifconfig | grep <returnedIP>" output

Cluster-1# isi_for_array -l "ifconfig | grep 192.168.228.10"

Cluster-1: inet 192.168.228.10 netmask 0xffffff00 broadcast 192.168.228.255 zone 1

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SmartConnect configuration (5)

Page

9

From the node where the SSIP address resides, attempt to resolve the

cluster name by running the following command, where <SC_FQDN> is the

fully qualified domain name of the SmartConnect zone, and <ssip> is the

SmartConnect Service IP address:

nslookup <SC_FQDN> <ssip>

Did the nslookup

query resolve to an

IP address?

Go to Page 10

Go to Page 13

Yes

No

You could have arrived here from:

Page 8 - SmartConnect configuration (4)

Locate which node the SSIP address resides on by running

the following command, where <ssip> is the

SmartConnect Service IP address:

isi_for_array -l "ifconfig | grep <ssip>"

See the example output at the bottom of this page.

Example isi_for_array -l "ifconfig | grep <ssip>" output

isi_for_array -s "ifconfig | grep 192.168.228.3"

cluster-1: inet 192.168.228.3 netmask 0xffffe000 broadcast 192.168.228.255 zone 1

Note The SmartConnect service will

respond only if the query comes in on

the SSIP address for the

SmartConnect zone. An SSIP

address for another zone will not

respond for a SmartConnect name

that does not belong to it.

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SmartConnect configuration (6)

Page

10

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From the client, locate the IP address of the client's

DNS server by running the following command from a

Windows CMD prompt:

ipconfig /all

See Appendix E for example output.

From the cluster, run the following command, where

<SC_FQDN> is the fully qualified domain name of the

SmartConnect zone, and <dnsIP> is the IP address

of the client's DNS server:

nslookup <SC_FQDN> <dnsIP>

Did the

command return an

IP address?

Go to Page 13 Go to Page 17

No

Yes

Yes

Does the IP

address reside on

the cluster?

Go to Page 11No

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SmartConnect configuration (7)

Page

11

Did your networking

team make any changes

to your network?

No

You could have arrived here from:

Page 8 - SmartConnect configuration (4)

Page 10 - SmartConnect configuration (6)

________________________________

_________________________________

The IP address returned by the DNS server does not

reside on the cluster. This indicates an IP address

conflict or DNS issue. The queries are being answered

with an IP address that does not reside on the cluster.

Contact your local networking team to check the

network and DNS configuration.

Note the page number that you

are currently on.

Upload log files and contact Isilon Technical

Support, as instructed in Appendix A.

Go to Page 13Yes

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Page

12

Was the failure

presented as a

refusal, a timeout, or

other failure?

Timeout

or other

failure

Refusal

Go to Page 13

Go to Page 17

A refusal indicates that the IP address the query is being sent to is either

not an SSIP address or not a valid IP address. The SmartConnect service

will respond only if the query comes in on the SSIP address for the

SmartConnect zone. An SSIP address for another zone will not respond

for a SmartConnect name that does not belong to it.

SmartConnect configuration (8)

You could have arrived here from:

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SmartConnect setup

Page

13

Verify that the SmartConnect name is typed correctly in the configuration.

If the SmartConnect name is typed incorrectly, fix it.

Go to Page 14

You could have arrived here from:

Page 8 - SmartConnect configuration (4)

Page 9 - SmartConnect configuration (5)

Page 10 - SmartConnect configuration (6)

Page 11 - SmartConnect configuration (7)

Page 12 - SmartConnect configuration (8)

Did fixing

the configured

SmartConnect name

resolve the

issue?

No

End troubleshootingYes

________________________________

_________________________________

_________________________________

_________________________________

________________________________

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SmartConnect setup (2)

Page

14

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Page 13 - SmartConnect setup

Look up the configuration of the delegation record (or NS record) by running the following command from the

cluster, where <fqdn> is the fully qualified domain name, and <dnsIP> is the IP address of the DNS server:

nslookup -norecurse -type=ns <fqdn> <dnsIP>

See the example output at the bottom of this page.

Go to Page 15

Example nslookup -norecurse -type=ns <fqdn> <dnsIP> output

Notes:

A delegation record (or NS record) should exist, and it should match the zone name.

An A record (shown in the output as internet address) should show as the SmartConnect Service IP address

cluster-1# nslookup -norecurse -type=ns example.isilon.local 192.168.38.101

Server: 192.168.38.101

Address: 192.168.38.101#53

Non-authoritative answer:

example.isilon.local nameserver = examplesip.isilon.local.

Authoritative answers can be found from:

examplesip.isilon.local internet address = 192.168.38.60

Delegation record

A record

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SmartConnect setup (3)

Page

15

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Does the output contain a line with the

SmartConnect Service IP address?Go to Page 17Yes

Every SmartConnect name on the cluster needs to have

a delegation record (or NS record). Check your DNS

server to verify that this delegation record (or NS record)

is configured.

The delegation record (or NS record) should point to a

SmartConnect IP address name A record.

The A record should point to a specific SSIP address for

the zone and the subnet where the SmartConnect name

resides. If this is not the case, you need to adjust your

A record so that it points to the correct zone and subnet.

No

Go to Page 16

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SmartConnect setup (4)

Page

16

You could have arrived here from:

Page 15 - SmartConnect setup (3)

Did you

make any configuration

changes?Yes

No

Depending on which DNS you are using, see one of the following articles about configuring SmartConnect:

Windows DNS: OneFS: How to configure Windows DNS for a SmartConnect zone, 442679

Infoblox DNS: How to configure Infoblox DNS to use with SmartConnect, 304465

Go to Page 17

Retest client access.

Has

access been

restored?No

End troubleshooting

Yes

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Packet capture

Page

17

Perform a packet capture (PCAP) on the cluster to ensure that requests

from the client are reaching the cluster.

Open an SSH connection on any node in the cluster and log in by using

the root account.

Run the following command, where <node> is the logical node number

(LNN) of the node that the SSIP address resides on, and <ssip> is the

SmartConnect Service IP address:

isi_netlogger -a -i all -n <node> -s 384 -- host <ssip>

Note If no spaces exist between

the arguments, be aware that

isi_netlogger will parse flags

improperly. The result is that

the isi_netlogger execution is

ineffective and captures

nothing. Ensure you leave a

space between any argument

and the specified value.

Also, isi_netlogger is unable

to capture traffic on VLANs. If

you need to capture traffic on

a VLAN, you will need to

specify the parent interface,

such as em0 or lagg0, or

use the tcpdump utility. If you

need guidance on using the

tcpdump utility, reference the

man page by typing man

tcpdump from the cluster's

command-line interface.

To locate the parent interface,

run ifconfig and look for

the VLAN you are on (see

example output at the bottom

of this page).

Reproduce the issue while the

PCAP is running on the cluster.

Go to Page 18

Example ifconfig outputvlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500

options=3<RXCSUM,TXCSUM>

ether 00:25:90:c7:06:ee

inet 192.168.99.3 netmask 0xffffff00 broadcast 192.168.99.255 zone 1

media: Ethernet autoselect (1000baseTX <full-duplex>)

status: active

vlan: 1897 parent interface: em0

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Page 12 - SmartConnect configuration (8)

Page 15 - SmartConnect setup (3)

Page 16 - SmartConnect setup (4)

_________________________________

___________________________

___________________________

_________________________________

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Packet capture (2)

Page

18

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The file produced by isi_netlogger can be extracted using a common file

compression utility.

If your tool of choice doesn't work, alternatives such as 7-zip, exist.

Review the results of the PCAP with your network and security teams to ensure that the

DNS queries from your DNS server are reaching the node where the SSIP address

resides.

Can you resolve

the issue with the

PCAP results?

End troubleshootingYes

Gather a full log set and PCAP output by running the following two

commands, in succession:

isi_gather_info

isi_gather_info --local-only --nologs -f /ifs/netlog

No

Note the page number that you

are currently on.

Upload log files and contact Isilon Technical

Support, as instructed in Appendix A.

To stop the PCAP, press CTRL+C. The compressed PCAP file is saved in the

/ifs/netlog/bundled folder and is named using the following time stamp format:

netlog-yyyy-mm-dd-hh.mm.ss.tar.bz2

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Contact EMC Isilon Technical Support

If you need to contact Isilon Technical Support during troubleshooting, reference the page or step that you need help with.

This information and the log file will help Isilon Technical Support staff resolve your case more quickly.

Appendix A: If you need further assistance

Upload node log files and the screen log file to EMC Isilon Technical Support

1. When troubleshooting is complete, type exit to end your screen session.

2. Gather and upload the node log set and include the SSH screen log file by using the command appropriate for your

method of uploading files. If you are not sure which method to use, use FTP.

ESRS:

isi_gather_info --esrs --local-only -f /ifs/data/Isilon_Support/screenlog.0

FTP:

isi_gather_info --ftp --local-only -f /ifs/data/Isilon_Support/screenlog.0

HTTP:

isi_gather_info --http --local-only -f /ifs/data/Isilon_Support/screenlog.0

SMTP:

isi_gather_info --email --local-only -f /ifs/data/Isilon_Support/screenlog.0

SupportIQ:

Copy and paste the following command.

Note: When you copy and paste the command into the command-line interface, it will appear on multiple lines (exactly

as it appears on the page), but when you press Enter, the command will run as it should.

isi_gather_info --local-only -f /ifs/data/Isilon_Support/screenlog.0 --noupload \

--symlink /var/crash/SupportIQ/upload/ftp

3. If you receive a message that the upload was unsuccessful, refer to article 304567 on the EMC Online Support site for

directions on how to upload files over FTP.

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Decision diamondYes No

Process stepProcess step with command:

command xyz

Go to Page #

Page

# Note Provides context and additional

information. Sometimes a note is linked

to a process step with a colored dot.

CAUTION!Caution boxes warn that

a particular step needs

to be performed with

great care, to prevent

serious consequences.

End point Document ShapeCalls out supporting documentation

for a process step. When possible,

these shapes contain links to the

reference document.

Sometimes linked to a process step

with a colored dot.

Optional process step

Directional arrows indicate

the path through the

process flow.

IntroductionDescribes what the section helps you to

accomplish.

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Page # - "Page title"

Appendix B: How to use this flowchart

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Appendix C: Example output

Example isi networks list pools -v output

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Example isi networks list pools -v outputsubnet0:pool0 - Default ext-1 pool

In Subnet: subnet0

Allocation: Static

Ranges: 1

10.25.102.212-10.25.102.214

Pool Membership: 3

1:ext-1 (up)

2:ext-1 (up)

3:ext-1 (up)

Aggregation Mode: Link Aggregation Control Protocol (

Access Zone: System (1)

SmartConnect:

Suspended Nodes : None

Auto Unsuspend ... 0

Zone : N/A

Time to Live : 0

Service Subnet : N/A

Example isi network pools list -v output

ID: groupnet0.subnet0.pool0

Groupnet: groupnet0

Subnet: subnet0

Name: pool0

Rules: rule0

Access Zone: System

Allocation Method: static

Aggregation Mode: lacp

SC Suspended Nodes: -

Description: Initial ext-1 pool

Ifaces: 1:ext-1, 2:ext-1, 3:ext-1

IP Ranges: 10.25.102.171-10.25.102.173

Rebalance Policy: auto

SC Auto Unsuspend Delay: 0

SC Connect Policy: round_robin

SC Zone:

SC DNS Zone Aliases: -

SC Failover Policy: round_robin

SC Subnet: -

SC TTL: 0

Static Routes: -

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Example nslookup <sczone> output

The expectation is for the command to return rotating IP addresses, or, at the very least, to show node IP addresses that

are not the SSIP address.

A successful result will show the IP address. In this example, the returned IP address is 192.168.228.14, shown in bold in

the following code example. If no IP address is listed, the command failed. If you receive other failures (for example a

timeout or an error message), contact Isilon Technical Support.

Cluster-1# nslookup test1

Server: 192.168.228.99

Address: 192.168.228.99#53

Name: test1.isilon.local

Address: 192.168.228.14

Example nslookup <SC_FQDN> output

Cluster-1# nslookup test1.isilon.local

Server: 192.168.228.99

Address: 192.168.228.99#53

Name: test1.isilon.local

Address: 192.168.228.14

Appendix D: Example output

Example nslookup output

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___________________

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Appendix E: Example output

Example ipconfig /all output

Example ipconfig /all output

Run this command from a Windows CMD prompt to determine the IP address of your local DNS servers.

The IP address is shown in bold in the following example output.

C:\Users\Administrator.DC>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : dc

Primary Dns Suffix . . . . . . . : example.local

Node Type . . . . . . . . . . . . : Hybrid

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : example.local

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection

Physical Address. . . . . . . . . : 00-0C-29-96-0A-C0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

IPv4 Address. . . . . . . . . . . : 192.168.228.99(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.228.2

DNS Servers . . . . . . . . . . . : 192.168.228.250

NetBIOS over Tcpip. . . . . . . . : Enabled

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