ATTO Technology 2700C Performance Issues, Checking the iSCSI OS driver, Checking the Applications

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7Some older switches cannot autonegotiate between the host and the switch properly. You could have to force the host or switch to the desired speed.

For a NIC using an OS iSCSI driver, continue to the iSCSI OS driver section.

Checking the iSCSI OS driver

If the host uses a driver that allows the OS to talk to iSCSI targets via a NIC, not an iSCSI storage adapter:

1A PC using an iSCSI storage adapter and an iSCSI OS driver might not work correctly on the same machine. Check with the vendors to make sure they are compatible.

2Verify that the PC has the latest iSCSI driver as well as the required service packs and patches. Check with the iSCSI OS driver vendor for more information.

3Verify that the iSCSI OS driver has started. Look under Device Manager for Windows or lsmod for Linux.

4Verify that the iSCSI OS is still looking for the iPBridge at the right IP address.

5If using DHCP, verify that the DHCP server is assigning the correct IP information to the host. Refer to Getting an IP address on page 10.

6Verify that the NIC is configured with the correct IP information.

7Verify that the hosts and the iPBridge are using the same port number to communicate iSCSI on the ATTO ExpressNAV iSCSI page. The default port number for the iPBridge is 3260.

8Check cable integrity. Check the cables for solid connections. Make sure they are plugged in properly. Inspect cable ends for broken clips and improper wiring.

Checking the Operating System

1Verify that the OS has the required service packs or patches installed. If not, obtain the proper service packs and patches and install them.

2Some iSCSI host adapters and iSCSI OS drivers do not always automatically find new targets when plugged in or when forced to rescan. Reboot the hosts.

3Check if the vendor has a new driver. If so, install it.

Checking the Applications

1Verify that the application is running the latest device drivers for the devices connected to iPBridge. If not, get the latest device drivers and install them.

2Verify with the application vendor if the iSCSI technology is supported on the version of the application being used.

Performance Issues

If the host is not getting the performance it should, check the following items.

Checking Fibre Channel devices

Verify that the devices are running at their highest possible speed. Refer to FCDataRate on page 48.

Checking the iPBridge Ethernet ports

1Verify that the data ports are set to auto negotiate or forced to 1000 Mbs on the ExpressNAV Ethernet page.

2Verify that the MTU size is set to optimal setting for the LAN/WAN environment.

Refer to Getting an IP address on page 10. 9k frame size is the current optimized frame size for the iPBridge. Smaller frame sizes causes a decrease in performance.

3Verify that the iPBridge TraceLog feature is disabled. Tracelog tracks certain events that

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occur in the iPBridge. With this log enabled, performance suffers.

Refer to TraceLog on page 46.

Checking the LAN/WAN

1Verify that the MTU size is set to optimal setting for the LAN/WAN environment on the ATTO ExpressNAV Ethernet page.

9k frame size is the current optimized frame size for the iPBridge. Smaller frame sizes causes a decrease in performance. Many switch and router vendors do not support the larger frame size of 9k or 16k.

2Verify that each associated port in the IP SAN is configured for 1000Mbs.

IP SAN traffic should be segmented so that it does not interfere with the main LAN network traffic.For better performance, the IP SAN should be on its own set of hardware.

ATTO Technology Inc. iPBridge Installation and Operation Manual

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Contents Atto iPBridge 2700C/R/D Atto Technology, IncPage Page Contents Updating firmware TroubleshootingAtto ExpressNAV pages Alternative interface optionsDiagnostic commands CLI commands summary General use commandsMaintenance commands Ethernet commands Serial port configuration commandsFibre Channel configuration commands ISCSI commandsAppendix B Cabling Iii Mapping commandsAppendix a Atto iPBridge, FibreBridge family Page Atto iPBridge 2700 provides storage options Atto iPBridge 2700 features, benefitsEmbedded software features Gigabit Ethernet GbE a transmissionPossible storage Configurations ScsiAtto iPBridge 2700R/D Installation instructions Back connector side Front label sideInstallation Atto iPBridge 2700R/D Fibre Channel interface Atto iPBridge 2700CEthernet interface Serial management headerFaceplate side Power side Configuring the iPBridge Getting an IP address Click Launch BrowserTarget names Default target nodeTarget management Map devices automaticallyChap to control access different Chap Automatically configure multiple targetsManually configure multiple target nodes Multiple target nodesMapping default vs. multiple target nodes Physical connections Initiator/Host to NetworkInstallation mapping Page Installation mapping Set the Real Time Clock Additional configurationsCreate a read only password or username Click Time & DateSet up a Vlan Virtual Local Area Network Snmp protocolOpen an ExpressNAV session Atto ExpressNAV interfaceBrowser compatibility Exhibit 3.0-1 An ExpressNAV Atto ExpressNAV pages Advanced CLI Configuration Bridge ConfigurationFirmware Update Manual Target Management iSCSI Target ManagementUpdating firmware Using Atto ExpressNAVUsing FTP over GbE Preliminary stepsFirmware update Check the Host Event Log TroubleshootingInside out method Check the event and trace logsCheck for problems on attached devices Exhibit 5.0-1 iPBridge 2700C faceplateCheck components Check iPBridge product versions and update firmwareCheck host versions Checking the LAN/WAN Checking the iSCSI Host Adapter or NICChecking the Operating System Performance IssuesChecking the iSCSI OS driver Checking the iPBridge Ethernet portsChecking the host system Checking the Ethernet host adapter or NICChecking applications Optimizing Atto ExpressNAV in Internet ExplorerUse Telnet Alternative interface optionsUse the serial port or header Type iPBridge in the New Connection dialog boxExhibit 6.0-1 Start up messages CLI provides ASCII-based interface Command conventions Symbol IndicatesFCTargets command ReadyCLI Error Messages CLI commands summary Command Defaults ExampleRmon Sntp Alternative interfaces CLI General use commands Username VerboseModeMaintenance commands SpeedWrite SpeedWriteDefaultSNTPServer TailEventLogDiagnostic commands EmailFromAddress DumpEventLogDumpTraceLog EmailNotifyRouteDisplay IsReservedPing SerialNumberTraceLog TemperatureSNMPTraps TraceLogFilterSerialPortEcho Serial port configuration commandsSerialPortBaudRate Fibre Channel configuration commands Ethernet commands ReadOnlyPassword ReadOnlyUsernameISCSI commands ISNSServer ISNSLoginControlISCSIWANIPAddress Mapping commands Route Atto iPBridge Product featuresAppendix a Atto FibreBridge family Atto FibreBridge Ethernet connections Appendix a CablingFibre Channel connections Cable length Cable sizeAppendix B Glossary Term DefinitionAppendix C Safety standards and compliances FCC Standards Radio and Television InterferenceVi Appendix Appendix D Atto accessories Appendix E Warranty, contact information Contact Atto Technology, Inc
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