Citrix Systems Server 6 Manuale Utente

Citrix XenServer ® 6.0 Administrator's GuidePublished Friday, 02 March 20121.1 Edition

xAlerts ... 106Customizing

82If you want to use a storage interface that can be routed from the primary management interface also (bearingin mind that this configuration is not

83The QoS value limits the rate of transmission from the VM. The QoS setting does not limit the amount of datathe VM can receive. If such a limit is d

84HostnameThe system hostname, also known as the domain or DNS name, is defined in the pool-wide database and modifiedusing the xe host-set-hostname-l

85To change the IP address of the pool master1. Use the pif-reconfigure-ip CLI command to set the IP address as desired. See Appendix A, Command LineI

86Diagnosing network corruptionSome network card models require firmware upgrades from the vendor to work reliably under load, or whencertain optimiza

87Disaster Recovery and BackupThe XenServer Disaster Recovery (DR) feature is designed to allow you to recover virtual machines (VMs) andvApps from a

88and Universal Unique Identifier (UUID), and its memory, virtual CPU and networking and storage configuration.It also includes the VM startup options

89Deployment ConsiderationsPlease review the following steps before enabling Disaster Recovery.Steps to Take Before a DisasterThe following section de

90Information for all VMs in the pool is stored, VMs do not need to be independently selectedfor protection.3. Click OK. Your pool is now protected.Re

911. In XenCenter select the secondary pool, and on the Pool menu, click Disaster Recovery to open the DisasterRecovery wizard.This wizard gives three

xiBond Parameters ... 118bond-create ...

92If you use Fibre Channel shared storage with LUN mirroring to replicate the data to thesecondary site, before you attempt to recover

93useful in the Disaster Recovery situation where an Administrator may choose to group all VMs which reside onthe same Storage Repository, or which re

94Citrix recommends that you frequently perform as many of the following backup procedures as possible torecover from possible server a

95Backing up single host installationsUse the CLI to backup the pool database. To obtain a consistent pool metadata backup file, run pool-dump-da

96section called “Backing up Virtual Machine metadata”). This backup method should alwaysbe considered complementary to backing up the pool metadata.U

97VM SnapshotsXenServer provides a convenient snapshotting mechanism that can take a snapshot of a VM storage and metadataat a given time. Where neces

98 xe vm-snapshot vm=<vm uuid> new-name-label=<vm_snapshot_name> xe vm-snapshot-with-quiesce vm=<vm uuid> new-name-lab

99For example, specifying power-state=halted will select all VMs whose power-state field is equal to 'halted'. Wheremultiple VMs are matchin

1002. Note the UUID of the snapshot, and then run the snapshot-uninstall command to remove it:xe snapshot-uninstall snapshot-uuid=<snapshot-uuid>

1011. Use the command snapshot-export-to-template to create a new template file:xe snapshot-export-to template snapshot-uuid=<snapshot-uuid> \

xiihost-bugreport-upload ... 129host-crashdump-destroy ...

102VSS snap of volumes hosted on dynamic disks in the Windows Guest : The vm-snapshot-with-quiesce CLI and theXenServer VSS hardware provider do not

103Member failuresIn the absence of HA, master nodes detect the failures of members by receiving regular heartbeat messages. Ifno heartbeat has been r

104If the master is really dead, choose one of the members and run the command xe pool-emergency-transition-to-master on it. Once it has become the ma

105 xe pool-emergency-transition-to-master xe pool-recover-slaves 2. If the commands succeed, restart the VMs.To restor

106Monitoring and Managing XenServerXenServer and XenCenter provide access to alerts that are generated when noteworthy things happen. XenCenterprovid

107The following alerts appear on the performance graphs in XenCenter. See the XenCenter online help for moreinformation:• vm_cloned• vm_crashed• vm_r

108alarm_trigger_periodnumber of seconds that values above or below the alarm threshold can be received before an alarm is sent(default 60)alarm_auto_

109The default priority level is 5.Note:Some SMTP servers only forward mails with addresses that use FQDNs. If you find that emailsare not being fo

110TroubleshootingCitrix provides two forms of support: free, self-help support on the Citrix Support website and paid-for SupportServices, which you

111xe host-param-set uuid=<xenserver_host_uuid> logging:syslog_destination=<hostname>2. Issue the command:xe host-syslog-reconfigure uuid=

xiiiLog Commands ... 136log-set-output ...

112Appendix A. Command Line InterfaceThis chapter describes the XenServer command line interface (CLI). The xe CLI enables the writing of scripts fora

113-u username-pw password-pwf password file-p port-s serverExample: On a remote XenServer host:xe vm-list -u <myuser> -pw <mypassword> -s

114• <class>-param-get• <class>-param-set• <class>-param-list• <class>-param-add• <class>-param-remove• <class>-pa

115platform (MRW): acpi: true; apic: true; pae: true; nx: falseallowed-operations (SRO): pause; clean_shutdown; clean_reboot; \hard_shutdown; hard_reb

116xe vm-list params=allNote that some parameters that are expensive to calculate will not be shown by the list command. Theseparamet

117Creates an appliance/vApp. For example:xe appliance-create name-label=my_applianceAdd VMs to the appliance:xe vm-param-set uuid=<VM-UUID> app

118xe audit-log-get since=2009-09-24T17:56:20.530Z \filename=/tmp/auditlog-pool-actions.outBonding CommandsCommands for working with network bonds, fo

119Parameter Name Description Typesr-uuid The unique identifier/object reference forthe SR this CD is part ofread onlysr-name-label The name for t

120List the CDs and ISOs (CD image files) on the XenServer host or pool, filtering on the optional argument params.If the optional argument params is

121sr-whitelist lists SR UUIDs, drtask-create will only introduce and connect to an SR which hasone of the whitelisted UUIDsdrtask-destroydrtask-destr

xivpif-unplug ... 144Pool Commands ...

122On the primary site, enable database replication:xe sr-database-replication uuid=<sr=uuid> In the event of disaster, on the

123Class name Descriptionpbd The physical block devices through which hosts access SRsevent-waitevent-wait class=<class_name> [<param-name>

124Parameter Name Description Typegpu-group-name-label The name of the GPU group towhich the pGPU is assignedRead onlyhost-uuid The unique identifie

125Parameter Name Description Typevm-uuid The unique identifier/objectreference for the VM to whichthe vGPU is assignedRead onlyvm-name-label T

126Host ParametersXenServer hosts have the following parameters:Parameter Name Description Typeuuid The unique identifier/objectreference for the

127Parameter Name Description Typelicense-server • A list of key/value pairs thatspecify information about thelicense server• The default port

128Parameter Name Description Typeexternal-auth-type Type of external authentication,for example, Active Directory.read onlyexternal-auth-service-name

129Parameter Name Description Typesize size of the crashdump, in bytes read onlyhost-backuphost-backup file-name=<backup_filename> host=<host

130Get a Xen dmesg (the output of the kernel ring buffer) from specified XenServer hosts.The host(s) on which this operation should be performed are s

131Download system status information into the specified file. The optional parameter entries is a comma-separated list of system st

xvtemplate-export ... 157Update Commands ...

132The host(s) on which this operation should be performed are selected using the standard selection mechanism(see host selectors above).host-is-in-em

133Warning:Be extremely careful when using this CLI command off-host, since once it is run it will not bepossible to connect to the control domain rem

134Reboot the specified XenServer hosts. The specified hosts must be disabled first using the xe host-disablecommand, otherwise a HOST_

135The host(s) on which this operation should be performed are selected using the standard selection mechanism(see host selectors above). Optional arg

136Log CommandsCommands for working with logs.log-set-outputlog-set-output output=nil | stderr | file:<filename> | syslog:<sysloglocation>

137message-destroymessage-destroy {uuid=<message_uuid>}Destroys an existing message. You can build a script to destroy all messages. For example

138Parameter Name Description Typeother-config:ethtool-autonegset to no to disable autonegotiation of thephysical interface or bridge. Default is yes.

139Parameter Name Description Typename-label The name of the patch read onlyname-description The description string of the patch read onlyapplied Whet

140Parameter Name Description Typeuuid The unique identifier/object reference forthe PBD.read onlysr-uuid the storage repository that the PBD poin

141PIF ParametersPIFs have the following parameters:Parameter Name Description Typeuuid the unique identifier/object reference forthe PIFread only

xviVLAN Commands ... 166vlan-create ...

142Parameter Name Description Typenetmask Netmask of the PIF, defined here if IP-configuration-mode is static; undefined ifsupplied by DHCP

143Parameter Name Description Typeother-config:ethtool-gso set to on to enable generic segmentationoffload, off to disableread writeother-config

144Using static IP addresses on physical network interfaces connected to a port on a switch usingSpanning Tree Protocol with STP Fast Link turned of

145Parameter Name Description Typeother-config a list of key/value pairs thatspecify additional configurationparameters for the poolread/write ma

146pool-ejectpool-eject host-uuid=<UUID of XenServer host to eject>Instruct the specified XenServer host to leave an existing pool.pool-emergenc

147Force the pool database to be synchronized across all hosts in the resource pool. This is not necessary in normaloperation since the database is re

148Parameter Name Description Typeallowed-operations list of the operations allowed on the SR inthis stateread only set parametercurrent-operat

149The exact device-config parameters differ depending on the device type. See Storage for details of theseparameters across the different storage bac

150Force an SR scan, syncing the xapi database with VDIs present in the underlying storage substrate.Task CommandsCommands for working with long-runni

151Parameter Name Description Typesubtasks contains the UUID(s) of all the subtasks ofthis taskread onlytask-canceltask-cancel [uuid=<task_uui

xviivm-recover ... 179vm-reset-powerstate ...

152Parameter Name Description Typememory-dynamic-max dynamic maximum memoryin bytes. Currently unused,but if changed the followingconstraint

153Parameter Name Description TypeVCPUs-params configuration parameters forthe selected VCPU policy.You can tune a VCPU's pinningwithxe tem

154Parameter Name Description Typeallowed-operations list of the operations allowed inthis stateread only set parametercurrent-operations list of th

155Parameter Name Description Typeresident-on the XenServer host on which aVM based on this template iscurrently resident; appears as<not

156Parameter Name Description TypePV-drivers-version the versions of theparavirtualized drivers for a VMbased on this template; appearsas <not i

157Parameter Name Description Typerecommendations XML specification ofrecommended values andranges for properties of this VMread onlyxenstore-data

158update-uploadupdate-upload file-name=<name_of_upload_file>Streams a new software image to a OEM edition XenServer host. You must then restart

159Parameter Name Description Typemode the mode the VBD should bemounted withread/writetype how the VBD appears to theVM, for example disk o

160vdi-uuid=<uuid_of_the_vdi_the_vbd_will_connect_to> [bootable=true] [type=<Disk | CD>] [mode=<RW | RO>]Create a new VBD on a VM.Ap

161The VDI objects can be listed with the standard object listing command (xe vdi-list), and the parametersmanipulated with the standa

xviiiModifying the Workload Balancing configuration options ... 187Editing the Workload Balancing configuratio

162Parameter Name Description Typexenstore-data data to be inserted into the xenstoretree (/local/domain/0/backend/vbd/<domid>/<device

163SR types that support sparse allocation of disks (such as Local VHD and NFS) do not enforcevirtual allocation of disks. Users should therefore take

164vdi-snapshotvdi-snapshot uuid=<uuid_of_the_vdi> [driver-params=<params>]Produces a read-write version of a VDI that can be used as a

165Parameter Name Description TypeMTU Maximum Transmission Unitof the VIF in bytes. Thisparameter is read-only, but youcan override the MTU

166Parameter Name Description Typeother-config:promiscuous true to a VIF to bepromiscuous on the bridge, sothat it sees all traffic over

167vlan-createvlan-create pif-uuid=<uuid_of_pif> vlan=<vlan_number> network-uuid=<uuid_of_network>Create a new VLAN on a XenServer h

168Parameter Name Description Typeversion the number of times this VMhas been recovered - if a userwishes to over write a new VMwith an old

169Parameter Name Description TypeVCPUs-params configuration parameters forthe selected VCPU policy.You can tune a VCPU's pinningwithxe vm-

170Parameter Name Description Typeactions-after-crash action to take if the VM crashes.For PV guests, valid parametersare: preserve (for analysis only

171Parameter Name Description TypePV-kernel path to the kernel read/writePV-ramdisk path to the initrd read/writePV-args string of kernel command

1Document OverviewThis document is a system administrator's guide for Citrix XenServer®, the complete server virtualization platformfrom Citrix®.

172Parameter Name Description TypeVCPUs-number the number of virtual CPUsassigned to the VMFor a paravirtualized LinuxVM, this number can d

173Parameter Name Description Typeactions-after-shutdown action to take after the VM hasshutdownread/writeactions-after-reboot action to take after th

174vm-assert-can-be-recoveredvm-assert-can-be-recovered <uuid> [<database>] <vdi-uuid>Tests whether storage is available to recover

175The VM or VMs on which this operation should be performed are selected using the standard selectionmechanism (see VM selectors).

176List crashdumps associated with the specified VMs.If the optional argument params is used, the value of params is a string containing a list of par

177Display the specified data source for a VM.Select the VM(s) on which to perform this operation by using the standard selection mechan

178If the metadata parameter is true, then the disks are not exported, and only the VM metadata is written tothe output file. This is intended to be u

179vm-memory-shadow-multiplier-setvm-memory-shadow-multiplier-set [<vm-selector>=<vm_selector_value>...][multiplier=<float_memory_multi

180The VM or VMs on which this operation should be performed are selected using the standard selectionmechanism (see VM selectors).

181vm-uninstallvm-uninstall [<vm-selector>=<vm_selector_value>...] [force=<true | false>]Uninstall a VM, destroying its disks (those

Citrix XenServer ® 6.0 Administrator's GuideCopyright © 2012 Citrix Systems. Inc. All Rights Reserved.Version: 6.0Citrix, Inc.851 West Cypress Cr

2• Increasing portability of VM images, as one VM image will work on a range of deployment infrastructuresAdministering XenServerThere are two methods

182pool-retrieve-wlb-diagnosticsUse the pool-retrieve-wlb-diagnostics command to return the full contents of the Workload Balancing Log filefor the W

183pool-deconfigure-wlbPermanently deletes all workload balancing configuration.pool-retrieve-wlb-configurationPrints all Workload Balancing configura

184xe pool-retrieve-wlb-report report=pool_health_history \LocaleCode=<en> \Start=<-3> \End=<0> \PoolID=<c75f9ee9-422f-9cde-4781-

185config:HostPifReadThresholdCritical=<HostPifReadThresholdCritical=value>\config:HostPifReadThresholdHigh=<HostPifReadThresholdHigh=value&g

186Appendix B. Workload Balancing ServiceCommandsService CommandsRun the following service commands on the Workload Balancing appliance. To do s

187Modifying the Workload Balancing configuration options Many Workload Balancing configurations, such as the database and web-service configur

188Double-check any values you enter in the wlb.conf file: Workload Balancing does not validatevalues in the wlb.conf file. Consequently, if the confi

189LoggingOptionTrace Flag Benefit or PurposeData SaveTraceDataSaveTrace Logs details about the pool being saved to the database.Score HostTraceScor

3Rolling Pool Upgrade Wizard:• Simplify upgrades (automated or semi-automated) to XenServer 6.0 with a wizard that performs pre-checkswith a step-by-s

4VM Protection and Recovery:• Now available for Advanced, Enterprise and Platinum Edition customers.NFS Support for High Availability:• HA Heartbeat d

5Managing UsersDefining users, groups, roles and permissions allows you to control who has access to your XenServer hosts andpools and what actions th

6Understanding Active Directory Authentication in the XenServer EnvironmentEven though XenServers are Linux-based, XenServer lets you use Active Direc

7Note the following:• XenServer labels its AD entry on the AD database using its hostname. Therefore, if two XenServer hosts havethe same hostname and

8Note:XenServer uses Likewise (Likewise uses Kerberos) to authenticate the AD user in the AD server,and to encrypt communications with the AD server.H

9you wish to manage user permissions in Active Directory, you could create a single group that you then add andremove users to/from; alternatively, yo

10they may be able to continue to access the pool using XenCenter or other API sessions that they have alreadycreated. In order to terminate these se

11RBAC depends on Active Directory for authentication services. Specifically, XenServer keeps a list of authorizedusers based on Active Directory user

iiiContentsDocument Overview ... 1Introducing XenServer ...

12Note:You cannot add, remove or modify roles in this version of XenServer.Warning:You can not assign the role of pool-admin to an AD group which has

13RolepermissionsPool Admin PoolOperatorVM PowerAdminVM Admin VM Operator Read OnlyCancel taskof any userX XPoolmanagementX XVMadvancedoperationsX X

14RolepermissionsPool Admin PoolOperatorVM PowerAdminVM Admin VM Operator Read OnlyConnect topool andread all poolmetadataX X X X X XDefinitions

15Permission Allows Assignee To Rationale/CommentsPool management • Set pool properties (naming,default SRs)• Enable, disable, and configureHA•

16Permission Allows Assignee To Rationale/CommentsVM advanced operations • Adjust VM memory (throughDynamic Memory Control)• Create a VM snapsho

17Permission Allows Assignee To Rationale/CommentsAccept WLB PlacementRecommendations• Select one of theservers Workload Balancingrecommends f

18uuid( RO): 0165f154-ba3e-034e-6b27-5d271af109baname ( RO): pool-admindescription ( RO): The Pool Administrator role can do anything uu

19uuid ( RO): bb6dd239-1fa9-a06b-a497-3be28b8dca44subject-identifier ( RO): S-1-5-21-1539997073-1618981536-2562117463-2244other-config (MRO): subject-

201. Run the commands:xe subject-role-remove uuid=<subject uuid> role-name= \ <role_name_to_remove>xe subject-role-add uuid=<subject

21In this illustration, since Subject 2 (Group 2) is the Pool Operator and User 1 is a memberof Group 2, when Subject 3 (User 1) tries to log in, he o

ivHosts and Resource Pools Overview ... 22Requirements for Creating Re

22XenServer Hosts and Resource PoolsThis chapter describes how resource pools can be created through a series of examples using the xe commandline int

23The requirement for a XenServer host to have a static IP address to be part of a resource poolalso applies to servers providing shared NFS or iSCSI

24XenServer 6.0 simplifies expanding deployments over time by allowing disparate host hardware to be joined intoa resource pool, known as heterogeneou

25subsequently join will also be connected to the storage. The Universally Unique Identifier (UUID) of thecreated storage repository will be prin

26Warning:Citrix highly recommends rebooting all XenServers prior to installing an update and thenverifying their configuration. This

27Block Devices (VBDs) and networks can affect which VMs may be restarted on which hosts. Currently it is notpossible for XenServer to check all actio

28• it must have its virtual disks on shared storage (any type of shared storage may be used; the iSCSI, NFS or FibreChannel LUN is only required for

29best-effort priority setting are not part of the failover plan and are not guaranteed to be kept running, sincecapacity is not reserved for them. If

30Recovering an Unreachable HostIf for some reason a host cannot access the HA statefile, it is possible that a host may become unreachable.To recove

31• Hewlett-Packard Integrated Lights-Out (iLO). To use XenServer with iLO, you must enable iLO on the host andconnect interface to the network. For m

vStorage Overview ... 34Storage Repositorie

32When you create a custom script, run it from the command line each time you want to control power remotelyon XenServer. Alternatively, you can speci

33The result is only displayed when the script is unsuccessful.import XenAPI def custom(session,remote_host,power_on_config):result="Power On Not

34StorageThis chapter discusses the framework for storage abstractions. It describes the way physical storage hardware ofvarious kinds is mapped to VM

35Virtual Block Devices (VBDs)Virtual Block Devices are connector objects (similar to the PBD described above) that allows mappings betweenVDIs and VM

36unused space on the underlying CoW instance disk is reclaimed when a snapshot or clone occurs. The differencebetween the two behaviors can be charac

37operations are mapped directly onto the array APIs using a LUN per VDI representation. This includes activatingthe data path on demand such as when

38By default, XenServer uses the local disk on the physical host on which it is installed. The Linux Logical VolumeManager (LVM) is used to manage VM

39xe sr-create host-uuid=<valid_uuid> content-type=iso \ type=iso name-label=<"Example ISO SR"> \ device_config:location=<n

40For more information on using CSL SR types with XenCenter, see the XenCenter online help.Because the CSL SR can be used to access different storage

41Parameter name Description Optional?target The server name or IP address ofthe array management consoleNostorageSystemId The storage system

viLVM over Hardware HBA ... 49Storage Configuration ...

42To Create a CSL SR Using the CLI1. Use the sr-probe command with the device-config:target parameter and username and passwordcredentials to identify

43xe sr-probe type=cslg device-config:adapterid=NETAPP \ device-config:username=**** device-config:password=**** \ device-config:target=****<

44You can use grep to filter the sr-probe output to just display the storage system IDs:xe sr-probe type=cslg device-config:adapterid=NETAPP \ device

45/opt/QLogic_Corporation/SANsurferiCLI/iscli -ipdhcp 02. Add a persistent iSCSI target to port 0 of the HBA./opt/QLogic_Corporation/SANsurferiCLI/isc

46Parameter Name Description Required?port the network port number on which to query the target nousediscoverynumber the specific iSCSI record index t

47xe sr-probe type=lvmohba \host-uuid=1212c7b3-f333-4a8d-a6fb-80c5b79b5b31Error code: SR_BACKEND_FAILURE_90Error parameters: , The request is missing

48the zoning for the affected hosts and use the Repair Storage Repository function instead ofremoving and re-creating the SR.NFS VHDThe NFS VHD type s

49Creating a Shared NFS SR (NFS)Device-config parameters for NFS SRs:Parameter Name Description Required?server IP address or hostname of the NFSserve

50There are two basic steps involved in creating a new storage repository for use on a XenServer host using the CLI:1. Probe the SR type to determine

51To check if an SR has been upgraded, verify that its sm-config:use_vhd key is true. To check if a VDI wascreated with type=raw, check its sm-config

viixe CLI Commands ... 64Display the Static

52xe sr-probe type=lvmoiscsi device-config:target=192.168.1.10 \ device-config:targetIQN=iqn.192.168.1.10:filer1Error code: SR_BACKEND_FAILURE_107Err

53SR type device-config parameter, in order ofdependencyCan beprobed?Required for sr-create?chapuser No Nochappassword No Noaggregate No*YesFlexV

54†Storage pool probing is only possible at sr-create time. It needs to be done there so that the aggregate can be specified at the point that theSR i

55Multipath support in EqualLogic arrays does not encompass Storage IO multipathing in thetraditional sense of the term. Multipathing must be handled

56The following example introduces a SR of type lvmoiscsi.1. Probe the existing SR to determine its UUID:xe sr-probe type=lvmoiscsi device-config:targ

576. Click Repair to create and plug a PBD for each host in the pool.Moving Virtual Disk Images (VDIs) Between SRsThe set of VDIs associated with

58to the SR. The corresponding PBD must be unplugged and re-plugged for the scheduler parameter to take effect.The disk scheduler can be adjusted usin

592. This command suspends the VM (unless it is already powered down), initiates the space reclamation process,and then resumes the VM.Note:Citrix rec

60xe vbd-param-set uuid=<vbd_uuid> qos_algorithm_type=ionicexe vbd-param-set uuid=<vbd_uuid> qos_algorithm_params:sched=rtxe vbd-param-set

61Configuring VM MemoryWhen a VM is first created, it is allocated a fixed amount of memory. To improve the utilisation of physical memoryin your XenS

viiiCreating a NIC bond ... 79Controlling the MAC Address of th

62For example, if the Dynamic Minimum Memory was set at 512 MB and the Dynamic Maximum Memory was setat 1024 MB this would give the VM a Dynamic Memor

63XenServer to repartition host memory dynamically in response to changing numbers of guests, or changinghost memory pressure. XenServer chooses a tar

64Operating System Supported Memory Limits4.5 - 4.8 x86≥ 256 MB ≤ 16 GB5.0 - 5.6 x86 x64≥ 512 MB ≤ 16 GBx86≥512 MB ≤8 GBRedHat EnterpriseLinux6.0x64≥

65xe vm-param-get uuid=<uuid> param-name=memory-static-{min,max}For example, the following displays the static maximum memory properties for the

66xe vm-memory-limits-set \ uuid=<uuid> \ static-min=<value> \ dynamic-min=<value> \ dynamic-max=<value> static-max=<v

67Xen Memory UsageWhen calculating the memory footprint of a Xen host there are two components that must be taken intoconsideration.

68name default descriptionmemory-overhead 1048576 (for example) The memory overhead due tovirtualizationDynamic memory values must be within the b

69NetworkingThis chapter provides an overview of XenServer networking, including networks, VLANs, and NIC bonds. It alsodiscusses how to manage your n

70• Provides detailed visibility into the behavior and performance of all traffic sent in the virtual networkenvironment.A vSwitch grea

71• A network, which is a virtual Ethernet switch on a XenServer host. Network objects have a name anddescription, a globally unique

ixvApps ... 92Using the M

72together so they logically function as one network card. Both NICs have the same MAC address and, in the caseof management interfaces, have one IP a

73When bonded NICs are used for VM (guest) traffic, you do not need to configure an IP address for the bond. Thisis because the bond operates at Layer

74This illustration shows how two NICs in a bonded pair use the same network settings, as representedby the networks in each host. The NICs in the bon

75This illustration shows how, when configured in Active-active mode, the links that are active in bonds varyaccording to traffic type. In the top pic

76Tip:Configuring active-passive mode in XenCenter is easy. You simply select Active-passive as thebond mode when you create the bond.Important:After

77Creating cross-server private networks requires Citrix XenServer Advanced editions or higher.To learn more about XenServer editions, and to

78To add or remove networks using XenCenter, refer to the XenCenter online Help.To add a new network using the CLI1. Open the XenServer host text cons

79This section describes how to use the xe CLI to bond NIC interfaces on a XenServer host that is not in a pool. Seethe section called “Creating NIC b

80Reverting NIC bondsIf reverting a XenServer host to a non-bonded configuration, be aware that the bond-destroy commandautomatically co

81• Use the host-list command to find the UUID of the host being configured:xe host-listAdding NIC bonds to an existing poolWarning:Do not attempt to