AWN-194549

en/google/compute/disk-multiaz.md

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+[![CloudSploit](https://cloudsploit.com/img/logo-new-big-text-100.png "CloudSploit")](https://cloudsploit.com)
+
+# GOOGLE / Compute / Disk MultiAz
+
+## Quick Info
+
+| | |
+|-|-|
+| **Plugin Title** | Disk MultiAz |
+| **Cloud** | GOOGLE |
+| **Category** | Compute |
+| **Description** |Ensure that Compute disks have regional disk replication feature enabled for high availability.|
+| **More Info** | Enabling regional disk replication will allow you to force attach a regional persistent disk to another VM instance in a different zone in the same region in case of a zonal outage. |
+| **GOOGLE Link** | https://cloud.google.com/compute/docs/disks/high-availability-regional-persistent-disk |
+| **Recommended Action** | Ensure that all Google compute disks have replica zones configured. |
+
+## Detailed Remediation Steps
+For synchronous and asynchronous application replication:
+
+-   Use two instances of the database and VM. In this case the following items determine the total cost:
+
+    -   VM instance costs
+    -   Persistent disk costs
+    -   Costs of maintaining application replication
+-   Use a single VM with regional persistent disks. To achieve high availability with a regional persistent disk, use the same VM instance and persistent disk components, but also include a regional persistent disk. Regional persistent disks are double the cost per byte compared to zonal persistent disks because they are replicated in two zones.
+
+    However, using regional persistent disks might reduce your maintenance cost because the data is automatically replicated to two replicas without the requirement of maintaining application replication.
+
+-   Do not start the second VM until failover is required. You can reduce host costs even more by starting the back-up VM only on demand during failover rather than maintaining the VM as a hot standby.