1 - Dell EMC Isilon Customer Troubleshooting Guide: Troubleshoot Your SmartConnect
Configuration
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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
2 - Dell EMC Isilon Customer Troubleshooting Guide: Troubleshoot Your SmartConnect
Configuration
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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.
4 - Dell EMC Isilon Customer Troubleshooting Guide: Troubleshoot Your SmartConnect
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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
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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)
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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
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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:
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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
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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
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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)
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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
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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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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
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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 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.
You could have arrived here from:
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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Page 10 - SmartConnect configuration (6)
24 - Dell EMC Isilon Customer Troubleshooting Guide: Troubleshoot Your SmartConnect
Configuration
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