High Availability (HA) Aidan Finn
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1 High Availability (HA) Aidan Finn
2 About Aidan Finn Technical Sales Lead at MicroWarehouse (Dublin) Working in IT since 1996 MVP (Virtual Machine) Experienced with Windows Server/Desktop, System Center, virtualisation, and IT Published author/contributor of several books
3 Books System Center 2012 VMM Windows Server 2012 Hyper-V
4 Agenda Item 1 Item 2 Item 3 4
5 What is HA?
6 High Availability From the Hyper-V perspective, HA is about infrastructure fault tolerance Example: 1. HostA is one of a number of hosts in a cluster 2. Every host in the cluster stores VM files on shared storage, such as a SAN 3. VM01 is running on HostA 4. HostA stops running 5. VM01 automatically fails over to another host in the cluster 6. VM01 automatically boots up There is some downtime for VM01 but it is minimized The cluster has acted as a unit to protect against the failure of HostA
7 Two or more hosts A Typical Hyper-V Cluster Each host is connected to a set of networks with special roles All hosts are connected to the a shared cluster-supported storage system All HA VMs are stored on the shared storage
8 Managing Failure
9 The Heartbeat Failover Clustering conducts health monitoring between nodes to detect when servers are no longer available When servers are unresponsive clustering takes recovery action Unicast in nature and uses a Request- Reply type process for reliability and security Not just a basic ping Yes You there?
10 Failover Cluster Virtual Adapter Failover Cluster Virtual Adapter (NetFT) is a virtual network adapter that builds fault-tolerant TCP connections across all available interfaces between nodes in the cluster NetFT is the mechanism by which clusters use multiple clusterenabled adapters to communicate Seamless internode communication NetFT will dynamically and seamlessly switch cluster communication to a different network (based on priority) when a network fails Long story short: The cluster can use multiple enabled networks for cluster communications and is fault tolerant 10
11 Heartbeat Detection Runs on TCP 3343 WS2012 R2 Hyper-V clusters: Nodes exchange heartbeats every 1 second Will allow for failure for up to 10 seconds (5 on non Hyper-V) for nodes on the same subnet Will allow for failure for up to 20 seconds (5 on non Hyper-V) for nodes on different subnets No response after that threshold the host is assumed offline and quorum must be obtained 11
12 Quorum
13 What is Quorum? Quorum is when you have enough voters to come to an agreement Primary function of cluster is to keep mission critical services online It needs to accomplish this without causing corruption or confusion This is why quorum is used 13
14 Explaining Quorum 14
15 Quorum Basics Sticking with WS2012 R2 to keep this simple Two types of vote breaker or witness Witness disk A 1 GB LUN that is created on the shared storage just for this purpose Configured as a witness disk in the cluster Owner of the disk is the vote breaker in case of tied vote for quorum File Share Witness Originally intended for multi-site clusters Now used for clusters that use SMB 3.0 for shared storage 15
16 Explaining Quorum 16
17 Other Quorum Concepts Sequential host failure (WS2012) Scenario when one host after another after another drops offline Quorum can be still obtained, even if less than half the nodes are online Dynamic quorum (WS2012 R2) When the cluster rigs the quorum voting process Intended to give cluster more chance of staying online ALWAYS have a quorum witness Used to only do it with uneven number of nodes before WS2012 R2 17
18 Cluster Storage
19 Why Storage Is Needed The Hyper-V hosts provide HA to VMs Each host must have access to the VMs storage There is no replication from host-to-host inside a cluster All VMs are stored on shared storage Options include SAS storage area network (SAN) iscsi SAN Fibre channel SAN Fibre Channel over Ethernet (FCoE) SAN PCI RAID (WS2012 +) Storage Spaces (WS2012 +) SMB 3.0 (WS2012+ file shares) 19
20 Connectivity Each node is connected to the shared storage Exact same connectivity Dual path connectivity Multipath IO (MPIO) for traditional storage SMB Multichannel for SMB 3.0 storage All disks/luns/shares on the storage are assigned to all nodes Each host has equal access 20
21 Cluster-in-a-Box Take the requirements of a cluster Put it into a single enclosure 2+ blade servers with own power + networking JBOD or PCI RAID shared storage Hard wired cluster networking Designed for SME and branch office
22 Cluster Shared Volumes
23 Cluster Shared Volume (CSV) Microsoft s cluster file system Makes the volume on the disk active/active across all nodes Store lots of VMs on a single volume All able to run on any node in the cluster Every node connected to the disk can read/write to the volume One node owns the volume and is responsible for metadata operations: Owner AKA CSV Coordinator No drive letter Drive is mounted as folder under C:\ClusterStorage on each node You can (I usually do) rename that folder, e.g. CSV1
24 CSV Illustrated
25 A process used by CSV (only) Redirected IO Nodes in cluster redirect storage IO to pass over cluster network via CSV coordinator Done on per-csv basis, not per-cluster Used by W2008 R2 CSV for backup Caused concern Redirected IO NOT USED FOR BACKUP SINCE WS2012 Redirected IO is used by WS2012 for: Very brief metadata operations: permissions, file metadata, file create, file open, file extend Storage path fault tolerance: Node loses direct connection to storage and redirects via CSV owner to avoid outage
26 Redirected IO Illustrated
27 On W2008 R2: Controlling Redirected IO Redirected IO went across the cluster communications network Network with lowed routing metric (could be manipulated) On WS2012 and later: Uses SMB 3.0 and SMB Multichannel Can flood equal speed networks between nodes if not controlled Use SMB Multichannel Constraints to select which networks to talk to other cluster nodes New-SmbMultichannelConstraint -ServerName Node2,Node3 InterfaceAlias ClusterNet1,ClusterNet2
28 CSV Cache A read cache for virtual hard disks stored on the CSV Uses percentage of cluster node s RAM for the cache Size of cache is set once per cluster Boost read performance, e.g. VDI boot storm (Get-Cluster). SharedVolumeBlockCacheSizeInMB = 512 WS2012 Up to 20% of nodes RAM could be assigned to cache Enable each required CSV for CSV Cache Get-ClusterSharedVolume Cluster Disk 1 Set- ClusterParameter CsvEnableBlockCache 1 Required CSV to be disabled/enabled to start caching WS2012 R2 Up to 80% of nodes RAM can be assigned to cache CSV Cache enabled by default for each CSV
29 WS2012: Other CSV 2.0 Improvements Uses mount point instead of junction point Single synchronised VSS Snapshot for backup - no Redirected IO during backup Can enable BitLocker NTFS on CSV appears as CSVFS Supported for Hyper-V and Scale-Out File Server WS2012 R2: Supports ReFS file system I still would not do it yet unless volumes are huge (no CHKDSK) CSV ownership is automatically load balanced across nodes
30 Networking
31 Converged Networks In W2008 R2 we would have had 1 NIC or NIC team per required network Lots of NICs Very expensive to add 10 GbE or faster networking for peak usage Converged networks concept: Aggregate fewer NICs into an accumulation of bandwidth Divide that bandwidth up using WS2012+ QoS into required networks Makes adopting 10 GbE or faster from economic for medium/larger companies Much bigger concept than I have time to talk about today. See my posts on aidanfinn.com and Petri IT Knolwedgebase
32 Non-Converged with iscsi With SAS/FC SAN: 4 NICs, 8 with NIC teaming With iscsi SAN: 6 NICs, 10 with NIC teaming 1-2 more with dedicated backup network
33 Convergence Using Virtual NICs Management OS MPIO Management (VLAN 101) Cluster (VLAN 102) Live Migration (VLAN 103) Backup (VLAN 104) (VLAN 201) (VLAN 202) Virtual Switch NIC Team Hyper-V Port or Dynamic SAS/FC/iSCSI Storage Adapters pnic1 (DVMQ) Trunk Ports pnic2 (DVMQ) Top-of-Rack Switches
34 Convergence with SMB 3.0 Storage Management OS SMB Direct (W=70) Backup (W=20) Cluster (W=10) Management (VLAN 101, W=50) NIC Team (Dynamic) iwarp rnic (RSS, DCB) SMB Multichannel Constraint iwarp rnic (RSS, DCB) 1 Gbps NIC 1 Gbps NIC 10 Gbps Switch1 (VLAN 201, DCB) 10 Gbps Switch1 (VLAN 202, DCB) 1 Gbps Switch1 (Trunk Port) 1 Gbps Switch2 (Trunk Port)
35 Building a Cluster
36 Creating a Cluster Easier than ever Get the pieces right first: Storage Networking Process: 1. Validate the cluster fix until it passes 2. Deploy the cluster Get it right up front and it takes a few minutes Possible to automate using PowerShell
37 Finish the Cluster
38 Run Windows Update Completing the Cluster To get updates published via Windows Update Search for Recommended update for Windows Server 2012 R2 Failover Clustering To get the bug fixes that are usually not published via Windows Update
39 Configure Cluster Networks Rename the networks in Failover Cluster Manager I name them after the NICs that are on the networks Select your Live Migration network(s) Check multiple boxes if you elect to use SMB Live Migration
40 Configure Witness Cluster wizard will automatically find a suitable Disk Witness if one is available Make sure you check this You will have to add a File Share Witness if using SMB 3.0 storage
41 Configure Storage SMB 3.0 Storage Create one share for File Share Witness Create one or more shares for storing VMs Add all hosts to a security group Add all admins to a security group Grant full control to the shares Disk storage Provision 1 * 1 GB disk for disk witness Provision 1 or more LUNs per node in the cluster to store VMs Connect the disks to all nodes in the cluster Activate (GPT) and format the disks in Disk Manager on one node Add the disks to the cluster Convert storage disks to CSVs I rename the mount points to have consistent names
42 Patching a Cluster
43 Cluster Aware Updating Simple orchestration of cluster node updates Determines updates needed, moves workloads off nodes for updates Uses Windows Update Agent direct from Microsoft or from WSUS Identifies node with least load Puts node in maintenance mode Verifies success, then moves to next node Maintains service availability and without impacting cluster quorum Can be: Scheduled Manually started from remote Failover Cluster Manager console Update Coordinator
44 Enabling Cluster Self-Updating Place all cluster nodes and cluster computer account in an OU for the cluster Delegate rights to cluster CAP Create/manage computer objects in this OU This is used to create another CAP/computer object for selfupdating CAU Launch CAU wizard in Failover Cluster Manager Configure Self-Updating job
45 Managing VMs
46 Use FCM All management of HA VMs is locked out in Hyper-V Manager Use Failover Cluster Manager You can order failover of VMs using Virtual Machine Priority (High/Medium/Low) You can drain a node of VMs by pausing the host
47 Backup There are products that support a WS2012 R2 Hyper-V cluster And then there are products that do it at least decently Test & research Do not trust sales & marketing Many have been stung, especially by: Companies known by 2 letters Companies that add support 12 months after a server release
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