Merge pull request #89460 from tamram/tamram-0923

clarify that LRS writes to 3 replicas

Author: ktoliver

articles/storage/common/storage-redundancy-lrs.md

@@ -1,12 +1,12 @@
 ---
-title: Locally-redundant storage (LRS) for low-cost redundancy in Azure Storage | Microsoft Docs
+title: Locally-redundant storage (LRS) for low-cost redundancy in Azure Storage
 description: By default, new Azure storage accounts use locally-redundant storage (LRS) for replication. LRS is the least expensive option for replication. It protects against hardware failures in the datacenter, but not against datacenter-level disasters.
 services: storage
 author: tamram
 
 ms.service: storage
 ms.topic: article
-ms.date: 02/12/2019
+ms.date: 09/23/2019
 ms.author: tamram
 ms.reviewer: artek
 ms.subservice: common
@@ -21,3 +21,4 @@ ms.subservice: common
 - [Azure Storage replication](storage-redundancy.md)
 - [Zone-redundant storage (ZRS): Highly available Azure Storage applications](storage-redundancy-zrs.md)
 - [Geo-redundant storage (GRS): Cross-regional replication for Azure Storage](storage-redundancy-grs.md)
+- [Build highly available Azure Storage applications with geo-zone-redundant storage (GZRS) (preview)](storage-redundancy-gzrs.md)

includes/storage-common-redundancy-lrs.md

@@ -5,16 +5,18 @@
  author: tamram
  ms.service: storage
  ms.topic: include
- ms.date: 06/28/2019
+ ms.date: 09/23/2019
  ms.author: tamram
  ms.custom: include file
 ---
 
-Locally redundant storage (LRS) provides at least 99.999999999% (11 nines) durability of objects over a given year. LRS provides this object durability by replicating your data to a storage scale unit. A datacenter, located in the region where you created your storage account, hosts the storage scale unit. A write request to an LRS storage account returns successfully only after the data is written to all replicas. Each replica resides in separate fault domains and upgrade domains within a storage scale unit.
+Locally redundant storage (LRS) replicates your data three times within a single data center. LRS provides at least 99.999999999% (11 nines) durability of objects over a given year. LRS is the lowest-cost replication option and offers the least durability compared to other options.
 
-A storage scale unit is a collection of racks of storage nodes. A fault domain (FD) is a group of nodes that represent a physical unit of failure. Think of a fault domain as nodes belonging to the same physical rack. An upgrade domain (UD) is a group of nodes that are upgraded together during the process of a service upgrade (rollout). The replicas are spread across UDs and FDs within one storage scale unit. This architecture ensures your data is available if a hardware failure affects a single rack or when nodes are upgraded during a service upgrade.
+If a datacenter-level disaster (for example, fire or flooding) occurs, all replicas in a storage account using LRS may be lost or unrecoverable. To mitigate this risk, Microsoft recommends using zone-redundant storage (ZRS), geo-redundant storage (GRS), or geo-zone-redundant storage (GZRS).
 
-LRS is the lowest-cost replication option and offers the least durability compared to other options. If a datacenter-level disaster (for example, fire or flooding) occurs, all replicas may be lost or unrecoverable. To mitigate this risk, Microsoft recommends using zone-redundant storage (ZRS), geo-redundant storage (GRS), or geo-zone-redundant storage (GZRS).
+A write request to an LRS storage account returns successfully only after the data is written to all three replicas.
+
+You may wish to use LRS in the following scenarios:
 
 * If your application stores data that can be easily reconstructed if data loss occurs, you may opt for LRS.
 * Some applications are restricted to replicating data only within a country/region due to data governance requirements. In some cases, the paired regions across which the data is replicated for GRS accounts may be in another country/region. For more information on paired regions, see [Azure regions](https://azure.microsoft.com/regions/).