|
|
|
VM Mobility |
|
|
|
Live Migration of VMs
Details
|
=BW26
|
Yes XenMotion
XenMotion is available in all versions of XenServer and allows you to move a running VM from one host to another host, when the VMs disks are located on storage shared by both hosts. This allows for pool maintenance features such as Workload Balancing (WLB), High Availability (HA), and Rolling Pool Upgrade (RPU) to automatically move VMs. These features allow for workload leveling, infrastructure resilience, and the upgrade of server software, without any VM downtime. Storage can only be shared between hosts in the same pool, as a result, VMs can only be moved within the same pool.
|
Yes (vMotion)
vMotion
- Cross vSwitch vMotion (all versions)
- Cross vCenter vMotion (n/a for Standard)
- Long Distance vMotion (n/a for Standard)
- Cross Cloud vMotion (n/a for Standard)
- Encryption vMotion (n/a for Standard)
|
|
|
Migration Compatibility
Details
|
=BW27
|
Yes (Heterogeneous Pools)
XenServer 5.6 introduced Heterogeneous Pools which enables live migration across different CPU types of the same vendor (requires AMD Extended Migration or Intel Flex Migration), details here: https://tinyurl.com/y44b3nxc.
This capability is maintained in Citrix Hypervisor
|
Yes (EVC)
Enhanced vMotion Compatibility - enabled on vCenter cluster-level, utilizes Intel FlexMigration or AMD-V Extended Migration functionality available with most newer CPUs (but cannot migrate between Intel and AMD), Details here: http://kb.vmware.com/kb/1005764
|
|
|
|
=BW28
|
Yes
Enabled through XenCenter
|
Yes
NEW
Maintenance mode is a core feature to prepare a host to be shut down safely.
vSphere 6.5: Faster Maintenance Mode and Evacuation Updates.
|
|
|
Automated Live Migration
Details
|
No
|
No, Workload Balancing
Workload Balancing (WLB) which was reintroduced in 6.5 is enhanced with XenServer 7.x. Available in Enterprise edition.
|
Yes (DRS) - CPU, Mem
NEW
vSphere 6.5
VM Distribution: Enforce an even distribution of VMs.
Memory Metric for Load Balancing: DRS uses Active memory + 25% as its primary metric.
CPU over-commitment: This is an option to enforce a maximum vCPU:pCPU ratios in the cluster.
Network Aware DRS - system look at the network bandwidth on the host when considering making migration recommendations.
Storage IO Control configuration is now performed using Storage Policies and IO limits enforced using vSphere APIs for IO Filtering (VAIO).
Storage Based Policy Management (SPBM) framework, administrators can define different policies with different IO limits, and then assign VMs to those policies.
|
|
|
|
No
|
No Workload Balancing
Power management is part of XenServer Workload Balancing (WLB) available in Enterprise edition.
Background: Power Management introduced with 5.6 was able to automatically consolidate workloads on the lowest possible number of physical servers and power off unused hosts when their capacity is not needed. Hosts would be automatically powered back on when needed.
|
Yes (DPM)
Distributed Power Management - enables to consolidate virtual machines onto fewer hosts and power down unused capacity - reducing power and cooling. This can be fully automated where servers are powered off when not needed and powered back on when workload increases.
|
|
|
Storage Migration
Details
|
=BW31
|
Yes (Storage Live Migration)
Storage Live Migration in Citrix Hypervisor works with the VM in any power state (stopped, paused or running)
Live migration and storage live migration are subject to the following limitations and caveats:
- VMs using PCI pass-through cannot be migrated.
- VM performance is reduced during migration.
- For storage live migration, pools protected by high availability, disable high availability before attempting VM migration.
- Time to completion of VM migration depends on the memory footprint of the VM and its activity. In addition, the size of the VDI and its storage activity affects VMs being migrated with storage live migration.
- IPv6 Linux VMs require a Linux Kernel greater than 3.0.
More info: https://tinyurl.com/yyq4txuv
|
Yes (Live Storage vMotion)
Storage vMotion allows to perform live migration of virtual machine disk files (e.g. across heterogeneous storage arrays) without vm downtime. Storage DRS handles initial vmdk placement and gives migration recommendations to avoid I/O and space utilization bottlenecks on the datastores in the cluster. The migration is performed using storage vMotion.
|
|
|
|
HA/DR |
|
|
|
|
=BW32
|
64 hosts / resource pool
NEW
64 Hosts per Resource Pool.
Please see Citrix Hypervisor Configuration Limits document https://tinyurl.com/y5o67fdj
Note: the maximum pool size, for Express edition is now restricted to 3 Hosts.
|
max 64 nodes / 8000 vm per cluster
Up to 64 nodes can be in a DRS/HA cluster, with a maximum of 8000 vm/cluster
|
|
|
Integrated HA (Restart vm)
Details
|
=BW33
|
Yes
Citrix Hypervisor High Availability protects the resource pool against host failures by restarting virtual machine. HA allows for configuration of restart priority and failover capacity. Configuration of HA is simple (effort similar to enabling VMware HA).
|
Yes (VMware HA)
NEW
vSphere 6.5 Proactive HA detect hw condition evacuate host before failure (plugin provided OEM vendors)
Quarantine mode - host is placed in quarantine mode if it is considered in degraded state
Simplified vSphere HA Admission Control - 'Percentage of Cluster Resources' admission control policy
vSphere 6.0
- Support for Virtual Volumes – With Virtual Volumes a new type of storage entity is introduced in vSphere 6.0.
- VM Component Protection – This allows HA to respond to a scenario where the connection to the virtual machine’s datastore is impacted temporarily or permanently.
“Response for Datastore with All Paths Down”
“Response for Datastore with Permanent Device Loss”
- Increased scale – Cluster limit has grown from 32 to 64 hosts and to a max of 8000 VMs per cluster
- Registration of “HA Disabled” VMs on hosts after failure.
VMware HA restarts virtual machines according to defined restart priorities and monitors capacity needs required for defined level of failover.
vSphere HA in vSphere 5.5 has been enhanced to conform with virtual machine-virtual machine anti-affinity rules. Application availability is maintained by controlling the placement of virtual machines recovered by vSphere HA without migration. This capability is configured as an advanced option in vSphere 5.5.
vSphere 5.5 also improved the support for virtual Microsoft Failover Clustering (cluster nodes in virtual machines) - note that this functionality is independent of VMware HA and requires the appropriate Microsoft OS license and configuration of a Microsoft Failover Cluster. Microsoft clusters running on vSphere 5.5 now support Microsoft Windows Server 2012, round-robin path policy for shared storage, and iSCSI and Fibre Channel over Ethernet (FCoE) for shared storage.
While not obvious to the user - with vSphere 5, HA has been re-written from ground-up, greatly reducing configuration and failover time. It now uses a one master - all other slaves concept. HA now also uses storage path monitoring to determine host health and state (e.g. useful for stretched cluster configurations).
|
|
|
Automatic VM Reset
Details
|
=BW34
|
No
There is no automated restart/reset of individual virtual machines e.g. to protect against OS failure
|
Yes (VMware HA)
NEW
vSphere 6.5 - Orchestrated Restart - VMware has enforced the VM to VM dependency chain, for a multi-tier application installed across multiple VMs.
Uses heartbeat monitoring to reset unresponsive virtual machines.
|
|
|
VM Lockstep Protection
Details
|
=BW35
|
No
While Citrix Hypervisor can perform VM restart in case of a host failure there is no integrated mechanism to provide zero downtime failover functionality.
|
Yes (Fault Tolerance) 4 vCPUs.
NEW
vSphere 6.5 FT has more integration with DRS and enhanced Network (lower the network latency)
Fault Tolerance brings continuous availability protection for VMs with up to 4 vCPUs in Enterprise Plus and Standard is 2 vCPUs.
Uses a shadow secondary virtual machine to run in lock-step with primary virtual machine to provide zero downtime protection in case of host failure.
|
|
|
Application/Service HA
Details
|
=BW36
|
No
There is no application monitoring/restart capability provided with Citrix Hypervisor
|
App HA
vSphere 6.5 Proactive HA detect hw condition evacuate host before failure (plugin provided OEM vendors)
Quarantine mode - host is placed in quarantine mode if it is considered in degraded state
Simplified vSphere HA Admission Control - 'Percentage of Cluster Resources' admission control policy
VMware HA restarts virtual machines according to defined restart priorities and monitors capacity needs required for defined level of failover.
|
|
|
Replication / Site Failover
Details
|
=BW37
|
Integrated Disaster Recovery
NEW
Citrix Hypervisor DR works by storing all the information needed to recover your business-critical VMs and vApps on storage repositories (SRs) that are then replicated from your primary (production) environment to a backup environment. When a protected pool at your primary site goes down, the VMs and vApps in that pool can be recovered from the replicated storage and recreated on a secondary (DR) site, with minimal application or user downtime.
Note: Citrix Hypervisor DR can only be used with LVM over HBA or LVM over iSCSI storage types.
Citrix Hypervisor VMs consists of two components:
- Virtual disks that are being used by the VM, stored on configured storage repositories (SRs) in the pool where the VMs are located.
- Metadata describing the VM environment. This is all the information needed to recreate the VM if the original VM is unavailable or corrupted. Most metadata configuration data is written when the VM is created and is updated only when you make changes to the VM configuration. For VMs in a pool, a copy of this metadata is stored on every server in the pool.
In a DR environment, VMs are recreated on a secondary (DR) site from the pool metadata - configuration information about all the VMs and vApps in the pool. The metadata for each VM includes its name, description and Universal Unique Identifier (UUID), and its memory, virtual CPU and networking and storage configuration. It also includes the VM’s startup options - start order, delay interval and HA restart priority - which are used when restarting the VM in an HA or DR environment. More info: https://tinyurl.com/y5skhhu4
|
Yes (vSphere Replication)
DR Orchestration (Vendor Add-On: VMware SRM)
NEW
vSphere Replication is VMware’s proprietary hypervisor-based replication engine designed to protect running virtual machines from partial or complete site failures by replicating their VMDK disk files.
This version extends support for the 5 minute RPO setting to the following new data stores: VMFS 5, VMFS 6, NFS 4.1, NFS 3, VVOL and VSAN 6.5.
|
