{"id":13022,"date":"2012-06-29T17:39:52","date_gmt":"2012-06-29T16:39:52","guid":{"rendered":"https:\/\/aidanfinn.com\/?p=13022"},"modified":"2012-06-29T17:39:52","modified_gmt":"2012-06-29T16:39:52","slug":"notesenabling-disaster-recovery-for-hyper-v-workloads-using-hyper-v-replica","status":"publish","type":"post","link":"https:\/\/aidanfinn.com\/?p=13022","title":{"rendered":"Notes\u2013Enabling Disaster Recovery for Hyper-V Workloads Using Hyper-V Replica"},"content":{"rendered":"<p>I\u2019m taking notes from <a href=\"http:\/\/channel9.msdn.com\/Events\/TechEd\/NorthAmerica\/2012\/VIR302\" target=\"_blank\">VIR302<\/a> in this post.&#160; I won\u2019t be repeating stuff I\u2019ve blogged about <a href=\"https:\/\/aidanfinn.com\/?p=12147\" target=\"_blank\">previously<\/a>.<\/p>\n<p><a href=\"http:\/\/channel9.msdn.com\/Events\/TechEd\/NorthAmerica\/2012\/VIR302\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; border-bottom: 0px; border-left: 0px; padding-left: 0px; padding-right: 0px; display: block; float: none; margin-left: auto; border-top: 0px; margin-right: auto; border-right: 0px; padding-top: 0px\" title=\"image\" border=\"0\" alt=\"image\" src=\"https:\/\/aidanfinn.com\/wp-content\/uploads\/2012\/06\/image65.png\" width=\"404\" height=\"184\" \/><\/a><\/p>\n<p><strong><u>Outage Information in SMEs<\/u><\/strong><\/p>\n<p>Data from Symantec SMB Disaster Preparedness Survey, 2011.&#160; 1288 SMBs with 5-1000 employees worldwide.<\/p>\n<ul>\n<li>Average number of outages per year? 6<\/li>\n<li>What does this outage cost per day? $12,500<\/li>\n<\/ul>\n<p>That\u2019s an average cost of $75,000 per year!&#160; To an SME!&#160; That could be 2 people\u2019s salary for a year.<\/p>\n<ul>\n<li>% That do not have a recovery plan: 50%.&#160; I think more business in this space don\u2019t have DR.<\/li>\n<li>What is their plan? Scream help and ask for pity.<\/li>\n<\/ul>\n<p><strong><u>Hyper-V Replica IS NOT Clustering And IT IS NOT a Cluster Alternative<\/u><\/strong><\/p>\n<p><strong><u>Hyper-V Replica IS ALSO NOT Backup Replacement<\/u><\/strong><\/p>\n<p>It is a replication solution for replicating VMs to another site.&#160; I just know someone is going to post a comment asking if they can use it as a cluster alternative [if this is you \u2013 it will be moderated to protect you from yourself so don\u2019t bother.&#160; Just re-read this section \u2026 slowly].<\/p>\n<ul>\n<li>Failover Clustering HA: Single copy, automated failover within a cluster.&#160; Corruption loses the single copy.<\/li>\n<li>Hyper-V Replica: Dual asynchronous copy with recent changes, manual failover designed for replication between sites.&#160; Corruption will impact original immediately and DR copy within 10 minutes.<\/li>\n<li>Backup: Historical copy of data, stored locally and\/or remotely, with the ability to restore a completely corrupted VM.<\/li>\n<\/ul>\n<p><strong><u>Certificates<\/u><\/strong><\/p>\n<p>For machines that are non-domain joined or non-trusted domain members.&#160; Hoster should issue certs to the customer in the hosted DR scenario.&#160; <\/p>\n<p><strong><u>Compression<\/u><\/strong><\/p>\n<p>Can disable it for WAN optimizers that don\u2019t work well with pre-optimised traffic.<\/p>\n<p><strong><u>Another Recovery History Scenario<\/u><\/strong><\/p>\n<p>The disaster brought down VMs at different points.&#160; So VMA died at time A and VMB died at time C.&#160; Using this feature, you can reset all VMs back to time A to work off of a similar set of data.<\/p>\n<p>You can keep up to 15 recovery points per day.&#160; Each recovery point is an hour\u2019s worth of data.&#160; <\/p>\n<p>The VSS option (application consistent recovery) fires every two hours.&#160; Every 2nd hour (or whatever depending on where you set the VSS slider) in the cycle it triggers VSS.&#160; All the writes in the guest get flushed.&#160; That replica is then sent over.<\/p>\n<p>Note that the Hyper-V VSS action will not interfere with backup VSS actions.&#160; Interoperability testing has been done.<\/p>\n<p>So if you\u2019re keeping recovery snapshots, you\u2019ll have standard replicas and application consistent (VSS) replicas.&#160; They\u2019ll all be an hour apart, and alternating (if every 2nd hour).&#160; Every 5 minutes the changes are sent over, and every 13th one is collapsed into a snapshot (that\u2019s where the 1 hour comes from).<\/p>\n<p>Every 4 hours appears to be the sweet spot because VSS does have a performance impact on the guests.<\/p>\n<p><strong><u>Clusters<\/u><\/strong><\/p>\n<p>You <em>can<\/em> replicate to\/from <a href=\"http:\/\/blogs.technet.com\/b\/virtualization\/archive\/2012\/03\/27\/why-is-the-quot-hyper-v-replica-broker-quot-required.aspx\" target=\"_blank\">clusters<\/a>.&#160; You <em>cannot<\/em> replicate from one node to another inside a cluster (can\u2019t have duplicate VM GUIDs and you have shared storage).<\/p>\n<p><strong><u>Alerting<\/u><\/strong><\/p>\n<p>If 20% of cycles in the last hour are missed then you get a warning.&#160; This will self-close when replication is healthy again.&#160; <\/p>\n<p><strong><u>PowerShell<\/u><\/strong><\/p>\n<p>24 Hyper-V Replica cmdlets:<\/p>\n<ul>\n<li>19 of them via get-command \u2013Module hyper-v | where {$_.Name \u2013like \u201c*replication*\u201d}<\/li>\n<li>5 more via get-command \u2013Module hyper-v | where {$_.Name \u2013like \u201c*failover*\u201d}<\/li>\n<\/ul>\n<p>Measure-VMReplication will return status\/health of Hyper-V Replica on a per-VM basis.<\/p>\n<p>Measure-VMReplication | where {$_.ReplicationHealth \u2013eq \u201cCritical\u201d}<\/p>\n<p>Could use that as a part of a scheduled script, and then send an email with details of the problem.<\/p>\n<p><strong><u>Replica Mechanism<\/u><\/strong><\/p>\n<p>Refers to the HRL (Hyper-V Replica Log) process as a write splitter.&#160; They use HTTP(s) for WAN traffic robustness.&#160; It\u2019s also hosting company friendly.&#160; The HRL is swapped out before sending for a new HRL.<\/p>\n<p>There is a threshold where the HRL cannot exceed half the VHD size.&#160; If WAN\/storage goes down and this happens then HVR goes into a \u201cresync state\u201d (resynchronisation).&#160; When the problem goes away HVR automatically re-establishes replication.&#160; <\/p>\n<p><strong><u>VM Mobility<\/u><\/strong><\/p>\n<p>HVR policy follows the VM with any kind of migration scenario.&#160; Remember that replication is host\/host.&#160; When the VM is moved from host A to host B, replication for the VM from host A is broken.&#160; Replication for the VM starts on host B.&#160; Host B must be already authorized on the replica host(s) \u2013 easier with cluster Hyper-V Replica broker.&#160; <\/p>\n<p><strong><u>IP Addressing VMs In DR Site<\/u><\/strong><\/p>\n<ol>\n<li>Inject static address \u2013 Simplest option IMO<\/li>\n<li>Auto-assignment via DHCP \u2013 Worst option IMO because DHCP on servers is <em>messy<\/em><\/li>\n<li>Preserve IP address via Network Virtualisation \u2013 Most scalable option for DR clouds IMO with seamless failover for customers with VMs on a corporate WAN.&#160; Only one for seamless name resolution, I think, unless you spend lots on IP virtualisation in the WAN.<\/li>\n<\/ol>\n<p><strong><u>Failover Types<\/u><\/strong><\/p>\n<p>Planned Failover (downtime during failover sequence):<\/p>\n<ol>\n<li>Shutdown primary VM<\/li>\n<li>Send last log \u2013 run planned failover action from primary site VM.&#160; That\u2019ll do the rest for us.<\/li>\n<li>Failover replica VM<\/li>\n<li>Reverse replication<\/li>\n<\/ol>\n<p>Test Failover (no downtime):<\/p>\n<p>Can test any recovery point without affecting replication on isolated test network.<\/p>\n<ol>\n<li>Start test failover, selecting which copy to test with (if enabled).&#160; It does the rest for you.<\/li>\n<li>Copies VM (new copy called \u201c&lt;original VM name&gt;<em> \u2013 test<\/em>\u201d) using a snapshot<\/li>\n<li>Connects VM to test virtual switch<\/li>\n<li>Starts up test VM<\/li>\n<\/ol>\n<p><strong><u>Network Planning<\/u><\/strong><\/p>\n<ul>\n<li>Capacity planning is critical.&#160; Designed for low bandwidth<\/li>\n<li>Estimate rate of data change<\/li>\n<li>Estimate for peak usage and effective network bandwidth<\/li>\n<\/ul>\n<p>My idea is to analyse incremental backup size, and estimate how much data is created every 5 minutes.<\/p>\n<p>Use WS2012 QoS to throttle replication traffic.<\/p>\n<p><a href=\"https:\/\/aidanfinn.com\/wp-content\/uploads\/2012\/06\/image66.png\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; border-bottom: 0px; border-left: 0px; padding-left: 0px; padding-right: 0px; display: block; float: none; margin-left: auto; border-top: 0px; margin-right: auto; border-right: 0px; padding-top: 0px\" title=\"image\" border=\"0\" alt=\"image\" src=\"https:\/\/aidanfinn.com\/wp-content\/uploads\/2012\/06\/image_thumb57.png\" width=\"504\" height=\"160\" \/><\/a><\/p>\n<p>Replicating multiple VMs in parallel:<\/p>\n<ul>\n<li>Higher concurrency leads to resource contention and latency<\/li>\n<li>Lower concurrency leads to underutilizing and less protection for the business<\/li>\n<\/ul>\n<p>Manage initial replication through scheduling.&#160; Don\u2019t start everything at once for online initial synchronisation.<\/p>\n<p>What they have designed for:<\/p>\n<p><a href=\"https:\/\/aidanfinn.com\/wp-content\/uploads\/2012\/06\/image67.png\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; border-bottom: 0px; border-left: 0px; padding-left: 0px; padding-right: 0px; display: block; float: none; margin-left: auto; border-top: 0px; margin-right: auto; border-right: 0px; padding-top: 0px\" title=\"image\" border=\"0\" alt=\"image\" src=\"https:\/\/aidanfinn.com\/wp-content\/uploads\/2012\/06\/image_thumb58.png\" width=\"504\" height=\"79\" \/><\/a><\/p>\n<p>&#160;<\/p>\n<p><strong><u>Server Impact of HVR<\/u><\/strong><\/p>\n<p>On the source server:<\/p>\n<ul>\n<li>Storage space: proportional to the writes in the VM<\/li>\n<li>IOPS is approx 1.5 times write IOPS<\/li>\n<\/ul>\n<p>On the replica server:<\/p>\n<ul>\n<li>Storage space: proportional to the write churn.&#160; Each additional recovery point approx 10% of the base VHD size.<\/li>\n<li>Storage IOPS: 0.6 times write IOPS to receive and convert.&#160; 3-5 times write IOPS to receive, apply, merge, for additional recovery points.<\/li>\n<p> There is a price to pay for recovery points.&#160; RECOMMENDATION by MSFT: Do not use replica servers for normal workloads if using additional recovery points because of the IOPS price.<\/ul>\n<p>Memory: Approx 50 MB per replicating VM<\/p>\n<p>CPU impact: &lt;3%<\/p>\n<div style=\"padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; display: inline; float: none; padding-top: 0px\" id=\"scid:0767317B-992E-4b12-91E0-4F059A8CECA8:1be93bc6-3da1-4a44-b47d-535c78e5c567\" class=\"wlWriterEditableSmartContent\">Technorati Tags: <a href=\"http:\/\/technorati.com\/tags\/Event+Notes\" rel=\"tag\">Event Notes<\/a>,<a href=\"http:\/\/technorati.com\/tags\/Windows+Server+2012\" rel=\"tag\">Windows Server 2012<\/a>,<a href=\"http:\/\/technorati.com\/tags\/Hyper-V\" rel=\"tag\">Hyper-V<\/a>,<a href=\"http:\/\/technorati.com\/tags\/Virtualisation\" rel=\"tag\">Virtualisation<\/a>,<a href=\"http:\/\/technorati.com\/tags\/DR\" rel=\"tag\">DR<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>I\u2019m taking notes from VIR302 in this post.&#160; I won\u2019t be repeating stuff I\u2019ve blogged about previously. Outage Information in SMEs Data from Symantec SMB Disaster Preparedness Survey, 2011.&#160; 1288 SMBs with 5-1000 employees worldwide. Average number of outages per year? 6 What does this outage cost per day? $12,500 That\u2019s an average cost of &hellip; <a href=\"https:\/\/aidanfinn.com\/?p=13022\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Notes\u2013Enabling Disaster Recovery for Hyper-V Workloads Using Hyper-V Replica&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[14],"tags":[61,176,181,195,118],"class_list":["post-13022","post","type-post","status-publish","format-standard","hentry","category-eventnotes","tag-dr","tag-eventnotes","tag-hyper-v","tag-virtualisation","tag-windows-server-2012"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"I\u2019m taking notes from VIR302 in this post. 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