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HP BL680c XenServer Administrator's Guide 4.1.0 - Page 42

Controlling Quality of Service QoS, 2.6. Dedicating a NIC to storage traffic

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Networking the MAC address of the bond should be the same as the PIF/NIC currently in use, allowing the IP address of the host received from DHCP to remain unchanged. The MAC address of the bond can be changed from PIF/NIC currently in use for the management interface, but doing so will cause existing network sessions to the host to be dropped when the bond is enabled and the MAC/IP address in use changes. The MAC address to be used for a bond can be controlled in two ways: • an optional mac parameter can be specified in the bond-create command. Using this parameter, the the bond MAC address can be set to any arbitrary address. • If the mac parameter is not specified, the MAC address of the first PIF listed in the pif-uuids parameter is used for the bond. 4.2.4.3. Reverting NIC bonds If reverting a XenServer Host to a non-bonded configuration, be aware of the following requirements: • As when creating a bond, all VMs with VIFs on the bond must be shut down prior to destroying the bond. After reverting to a non-bonded configuration, reconnect the VIFs to an appropriate network. • Move the management interface to another PIF using the pif-ip-reconfigure and host-management-reconfigure commands prior to issuing the bond-destroy command, otherwise connections to the host (including XenCenter) will be dropped. 4.2.5. Controlling Quality of Service (QoS) Enterprise Edition allows an optional Quality of Service (QoS) value to be set on VM virtual network interfaces (VIFs) using the CLI. The only QoS algorithm type supported in this release is rate limiting, specified as a maximum transfer rate for the VIF in Kb/s. For example, to limit a VIF to a maximum transfer rate of 100kb/s, use the vif-param-set command: xe vif-param-set uuid= qos_algorithm_type=ratelimit xe vif-param-set uuid= qos_algorithm_params:kbps=100 4.2.6. Dedicating a NIC to storage traffic XenServer Hosts automatically manage NICs as needed based on the related network, VIF, PIF, and bond configuration. In the default XenServer networking configuration, all network traffic to IP-based storage devices occurs over the PIF used for the management interface. To dedicate a NIC to storage traffic, it must be configured as unmanaged, and the NIC can no longer be used for XenServer networks. Procedure 4.5. To dedicate a NIC to storage traffic 1. Use the pif-list command to determine which PIF corresponds to the NIC to be dedicated to storage traffic. 2. Use the pif-forget command to mark the NIC as unmanaged. The NIC will remain unmanaged across host restarts. 3. Perform any required IP address configuration and enable the NIC using standard Linux commands. 36

Section	Page
XenServer Administrator's Guide	1
Table of Contents	4
Chapter 1. Overview	7
1.1. XenServer Hosts and resource pools	7
1.2. Networking	7
1.3. Storage	7
1.4. Command Line Interface	8
1.5. How this Guide relates to other documentation	8
Chapter 2. XenServer Hosts and resource pools	9
2.1. Requirements for creating resource pools	9
2.2. Creating a resource pool	10
2.3. Adding shared storage	10
2.4. Installing and managing VMs on shared storage	11
2.5. Removing a XenServer Host from a resource pool	11
2.6. Backups	12
2.7. Coping with machine failures	13
2.7.1. Member failures	13
2.7.2. Master failures	14
2.7.3. Pool failures	14
2.7.4. Coping with Failure due to Configuration Errors	14
2.7.5. Physical Machine failure	15
Chapter 3. Storage	17
3.1. Overview	17
3.1.1. Storage repositories (SRs)	17
3.1.2. Virtual Disk Images (VDI)	17
3.1.3. Managing Storage	18
3.2. Storage Repository Types	18
3.2.1. Local Disks	19
3.2.2. Local hotplug devices	19
3.2.3. Shared Network Attached Storage using NFS	19
3.2.4. Shared iSCSI Storage	20
3.2.4.1. XenServer Host iSCSI configuration	21
3.2.5. Shared LVM storage over FC or iSCSI hardware HBAs	21
3.2.6. Shared NetApp Storage	22
3.3. Storage configuration examples	24
3.3.1. Creating Storage Repositories	24
3.3.2. Probing an SR	25
3.3.3. Creating a local LVM SR (lvm)	27
3.3.4. Creating a local EXT3 SR (ext)	27
3.3.5. Creating a shared NFS SR (nfs)	27
3.3.6. Creating a shared LVM over iSCSI SR using the software iSCSI initiator (lvmoiscsi)	28
3.3.7. Creating a shared LVM over Fibre Channel or iSCSI HBA SR (lvmohba)	28
3.3.8. Creating a shared NetApp SR over iSCSI	31
3.4. Managing Storage Repositories	31
3.4.1. Destroying or forgetting a SR	31
3.4.2. Introducing a SR	32
3.4.3. Converting local Fibre Channel SRs to shared SRs	32
3.4.4. Moving Virtual Disk Images (VDIs) between SRs	33
3.4.4.1. Copying all of a VM's VDIs to a different SR	33
3.4.4.2. Copying individual VDIs to a different SR	33
3.4.5. Managing VDIs in a Netapp SR	34
3.4.6. Taking VDI snapshots with a Netapp SR	34
3.4.7. Adjusting the disk IO scheduler for an LVM-based SR	34
3.5. Managing Host Bus Adapters (HBAs)	34
3.5.1. Sample QLogic iSCSI HBA setup	35
3.5.2. Removing HBA-based FC or iSCSI device entries	35
3.6. Virtual disk QoS settings (Enterprise Edition only)	35
Chapter 4. Networking	37
4.1. Networking configuration performed during Host installation	37
4.2. Managing networking configuration for standalone XenServer Hosts	38
4.2.1. Creating networks	38
4.2.2. Connecting Virtual Machines (VMs) to networks	39
4.2.3. Creating VLANs	39
4.2.4. Creating NIC bonds	40
4.2.4.1. Creating a NIC bond on a dual-NIC host	40
4.2.4.2. Controlling the MAC address of the bond	41
4.2.4.3. Reverting NIC bonds	42
4.2.5. Controlling Quality of Service (QoS)	42
4.2.6. Dedicating a NIC to storage traffic	42
4.2.7. Changing networking configuration options	43
4.2.7.1. Hostname	43
4.2.7.2. DNS servers	43
4.2.7.3. XenServer Host IP address configuration	43
4.2.7.4. Management interface	43
4.2.7.5. Disabling management access	44
4.3. Managing networking configuration for XenServer pools	44
4.3.1. Networks in resource pools	44
4.3.2. Creating NIC bonds in resource pools	44
4.3.2.1. Adding NIC bonds to new resource pools	45
4.3.2.2. Adding NIC bonds to an existing pool	47
4.3.3. Changing XenServer Host IP address configuration in resource pools	48
4.3.4. NIC/PIF ordering	49
4.3.4.1. Verifying NIC ordering	49
4.3.4.2. Re-ordering NICs	50
4.4. Networking Troubleshooting	51
4.4.1. Diagnosing network corruption	51
4.4.2. Recovering from a bad network configuration	52
Chapter 5. Command line interface	53
5.1. Basic xe syntax	53
5.2. Special characters and syntax	54
5.3. Command types	55
5.3.1. Parameter types	56
5.3.2. Low-level param commands	56
5.3.3. Low-level list commands	57
5.4. xe command reference	58
5.4.1. Bonding commands	58
5.4.1.1. bond-create	58
5.4.1.2. bond-destroy	58
5.4.2. CD commands	59
5.4.2.1. cd-list	60
5.4.3. Console commands	60
5.4.4. Event commands	60
5.4.4.1. event-wait	61
5.4.5. Host (XenServer Host) commands	61
5.4.5.1. host-backup	64
5.4.5.2. host-bugreport-upload	64
5.4.5.3. host-crashdump-destroy	64
5.4.5.4. host-crashdump-upload	64
5.4.5.5. host-disable	65
5.4.5.6. host-dmesg	65
5.4.5.7. host-emergency-management-reconfigure	65
5.4.5.8. host-enable	65
5.4.5.9. host-evacuate	65
5.4.5.10. host-forget	65
5.4.5.11. host-get-system-status	66
5.4.5.12. host-get-system-status-capabilities	66
5.4.5.13. host-is-in-emergency-mode	67
5.4.5.14. host-license-add	67
5.4.5.15. host-license-view	67
5.4.5.16. host-logs-download	67
5.4.5.17. host-management-disable	68
5.4.5.18. host-management-reconfigure	68
5.4.5.19. host-reboot	68
5.4.5.20. host-restore	69
5.4.5.21. host-set-hostname-live	69
5.4.5.22. host-shutdown	69
5.4.5.23. host-syslog-reconfigure	69
5.4.6. Log commands	69
5.4.6.1. log-get-keys	70
5.4.6.2. log-reopen	70
5.4.6.3. log-set-output	70
5.4.7. Network commands	70
5.4.7.1. network-create	71
5.4.7.2. network-destroy	71
5.4.8. Patch (update) commands	71
5.4.8.1. patch-apply	71
5.4.8.2. patch-clean	71
5.4.8.3. patch-pool-apply	72
5.4.8.4. patch-precheck	72
5.4.8.5. patch-upload	72
5.4.9. PBD commands	72
5.4.9.1. pbd-create	72
5.4.9.2. pbd-destroy	73
5.4.9.3. pbd-plug	73
5.4.9.4. pbd-unplug	73
5.4.10. PIF commands	73
5.4.10.1. pif-forget	75
5.4.10.2. pif-introduce	75
5.4.10.3. pif-plug	75
5.4.10.4. pif-reconfigure-ip	75
5.4.10.5. pif-scan	75
5.4.10.6. pif-unplug	75
5.4.11. Pool commands	75
5.4.11.1. pool-designate-new-master	76
5.4.11.2. pool-dump-database	76
5.4.11.3. pool-eject	76
5.4.11.4. pool-emergency-reset-master	77
5.4.11.5. pool-emergency-transition-to-master	77
5.4.11.6. pool-join	77
5.4.11.7. pool-recover-slaves	77
5.4.11.8. pool-restore-database	77
5.4.11.9. pool-sync-database	77
5.4.12. Storage Manager commands	77
5.4.13. SR commands	78
5.4.13.1. sr-create	79
5.4.13.2. sr-destroy	79
5.4.13.3. sr-forget	79
5.4.13.4. sr-introduce	80
5.4.13.5. sr-probe	80
5.4.13.6. sr-scan	80
5.4.14. Task commands	80
5.4.14.1. task-cancel	81
5.4.15. Template commands	81
5.4.15.1. template-export	86
5.4.16. Update commands	86
5.4.16.1. update-upload	86
5.4.17. User commands	86
5.4.17.1. user-password-change	86
5.4.18. VBD commands	86
5.4.18.1. vbd-create	88
5.4.18.2. vbd-destroy	88
5.4.18.3. vbd-eject	88
5.4.18.4. vbd-insert	88
5.4.18.5. vbd-plug	88
5.4.18.6. vbd-unplug	88
5.4.19. VDI commands	89
5.4.19.1. vdi-clone	90
5.4.19.2. vdi-copy	90
5.4.19.3. vdi-create	90
5.4.19.4. vdi-destroy	90
5.4.19.5. vdi-forget	91
5.4.19.6. vdi-import	91
5.4.19.7. vdi-introduce	91
5.4.19.8. vdi-resize	91
5.4.19.9. vdi-snapshot	91
5.4.19.10. vdi-unlock	91
5.4.20. VIF commands	91
5.4.20.1. vif-create	93
5.4.20.2. vif-destroy	93
5.4.20.3. vif-plug	93
5.4.20.4. vif-unplug	93
5.4.21. VLAN commands	93
5.4.21.1. vlan-create	93
5.4.21.2. vlan-destroy	93
5.4.22. VM commands	93
5.4.22.1. vm-cd-add	98
5.4.22.2. vm-cd-eject	98
5.4.22.3. vm-cd-insert	98
5.4.22.4. vm-cd-list	98
5.4.22.5. vm-cd-remove	99
5.4.22.6. vm-clone	99
5.4.22.7. vm-compute-maximum-memory	99
5.4.22.8. vm-copy	99
5.4.22.9. vm-crashdump-list	100
5.4.22.10. vm-create	100
5.4.22.11. vm-destroy	100
5.4.22.12. vm-disk-add	100
5.4.22.13. vm-disk-list	101
5.4.22.14. vm-disk-remove	101
5.4.22.15. vm-export	101
5.4.22.16. vm-import	101
5.4.22.17. vm-install	102
5.4.22.18. vm-memory-shadow-multiplier-set	102
5.4.22.19. vm-migrate	102
5.4.22.20. vm-reboot	103
5.4.22.21. vm-reset-powerstate	103
5.4.22.22. vm-resume	103
5.4.22.23. vm-shutdown	103
5.4.22.24. vm-start	103
5.4.22.25. vm-suspend	104
5.4.22.26. vm-uninstall	104
5.4.22.27. vm-vcpu-hotplug	104
5.4.22.28. vm-vif-list	104
Chapter 6. Troubleshooting	105
6.1. XenServer Host logs	105
6.1.1. Sending log messages to a central server	105
6.2. Troubleshooting connections between XenCenter and the XenServer Host	106
6.3. Special debug boot options	106

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Networking

the MAC address of the bond should be the same as the PIF/NIC currently in use, allowing the IP address

of the host received from DHCP to remain unchanged.

The MAC address of the bond can be changed from PIF/NIC currently in use for the management interface,

but doing so will cause existing network sessions to the host to be dropped when the bond is enabled and

the MAC/IP address in use changes.

The MAC address to be used for a bond can be controlled in two ways:

•

an optional

mac

parameter can be specified in the

bond-create

command. Using this parameter, the the

bond MAC address can be set to any arbitrary address.

•

If the mac parameter is not specified, the MAC address of the first PIF listed in the

pif-uuids

parameter

is used for the bond.

4.2.4.3. Reverting NIC bonds

If reverting a XenServer Host to a non-bonded configuration, be aware of the following requirements:

•

As when creating a bond, all VMs with VIFs on the bond must be shut down prior to destroying the bond.

After reverting to a non-bonded configuration, reconnect the VIFs to an appropriate network.

•

Move the management interface to another PIF using the

pif-ip-reconfigure

and

host-management-re-

configure

commands prior to issuing the

bond-destroy

command, otherwise connections to the host

(including XenCenter) will be dropped.

4.2.5. Controlling Quality of Service (QoS)

Enterprise Edition allows an optional Quality of Service (QoS) value to be set on VM virtual network inter-

faces (VIFs) using the CLI. The only QoS algorithm type supported in this release is rate limiting, specified

as a maximum transfer rate for the VIF in Kb/s.

For example, to limit a VIF to a maximum transfer rate of 100kb/s, use the

vif-param-set

command:

xe vif-param-set uuid=<VIF UUID> qos_algorithm_type=ratelimit

xe vif-param-set uuid=<VIF UUID> qos_algorithm_params:kbps=100

4.2.6. Dedicating a NIC to storage traffic

XenServer Hosts automatically manage NICs as needed based on the related network, VIF, PIF, and bond

configuration. In the default XenServer networking configuration, all network traffic to IP-based storage

devices occurs over the PIF used for the management interface. To dedicate a NIC to storage traffic, it must

be configured as unmanaged, and the NIC can no longer be used for XenServer networks.

Procedure 4.5. To dedicate a NIC to storage traffic

Use the

pif-list

command to determine which PIF corresponds to the NIC to be dedicated to storage

traffic.

Use the

pif-forget

command to mark the NIC as unmanaged. The NIC will remain unmanaged across

host restarts.

Perform any required IP address configuration and enable the NIC using standard Linux commands.