LRS

In the Ultra Transcenders books

AZ-305AZ-104AZ-900DP-900AZ-802

Each book explains LRS in context, with comparison tables and the common traps.

Terms in this definition

• Redundancy

  So that hardware failures, datacentre outages or a regional disaster cannot destroy data, Azure Storage keeps multiple copies: only in the primary region with LRS and ZRS, or in a secondary region as well with GRS and GZRS.

• Datacenter

  A building packed with racked servers that has its own electricity supply, cooling and network links. Microsoft gathers these buildings into Azure regions, and as a customer you pick the region, never which building your resources land in.

• region

  A provider-defined grouping in VCF Automation of Supervisors that all share one NSX Local Manager; tenants consume its compute, storage and memory via quotas set per region.

Related terms

• Backup storage redundancy

  Replication choice for a Recovery Services vault (GRS unless you pick LRS or ZRS). Set it before protecting the first item, because it is locked once backup has been configured.

• BlockBlobStorage

  Premium, SSD-backed account kind dedicated to block and append blobs, giving the lowest latency; redundancy is limited to LRS or ZRS and access tiers aren't available.

• Customer-managed account failover

  Makes the secondary of a geo-redundant storage account the new primary while keeping its DNS names. A planned failover preserves geo-redundancy, whereas after an unplanned one the account stays LRS until you set up geo-replication again.

• FileStorage

  Storage account kind on premium SSD dedicated to Azure Files, supporting only ZRS or LRS redundancy.

• GZRS

  Geo-zone-redundant storage. Writes go synchronously to at least three availability zones in the primary region, as ZRS does, and are later copied asynchronously to a secondary region that keeps LRS copies. With RA-GZRS that secondary can also be read.

• Managed disks

  Block storage disks for VMs whose underlying storage accounts Azure looks after. The only redundancy choices are LRS and ZRS.

• Premium Azure Files

  File shares on FileStorage accounts backed by SSDs, giving latency in single-digit milliseconds for transaction-heavy work. Only LRS and ZRS are offered, so geo-redundancy is unavailable.

• Premium page blob

  Storage account flavour (kind StorageV2, SKU Premium_LRS) that holds page blobs exclusively. It supports LRS only, has no access tiers and cannot be converted to ZRS.