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Amazon Elastic Block Retailer (Amazon EBS) io2 and io2 Block Categorical volumes now assist storage fencing utilizing NVMe reservations. As I discovered whereas scripting this publish, storage fencing is used to manage entry to storage for a compute or database cluster, guaranteeing that only one host within the cluster has permission to write down to the quantity at any given time. For instance, you may arrange SQL Server Failover Cluster Cases (FCI) and get larger software availability inside a single Availability Zone with out the necessity for database replication.
As a fast refresher, io2 Block Categorical volumes are designed to fulfill the wants of essentially the most demanding I/O-intensive functions working on Nitro-based Amazon Elastic Compute Cloud (Amazon EC2) situations. Volumes may be as massive as 64 TiB, and ship SAN-like efficiency with as much as 256,000 IOPS/quantity and four,000 MB/second of throughput, all with 99.999% sturdiness and sub-millisecond latency. The volumes assist different superior EBS options together with encryption and Multi-Connect, and may be reprovisioned on-line with out downtime. To be taught extra, you may learn Amazon EBS io2 Block Categorical Volumes with Amazon EC2 R5b Cases Are Now Typically Accessible.
Utilizing Reservations
To utilize reservations, you merely create an io2 quantity with Multi-Connect enabled, after which connect it to a number of Nitro-based EC2 situations (see Provisioned IOPS Volumes for a full checklist of supported occasion sorts):
You probably have present io2 Block Categorical volumes, you may allow reservations by detaching the volumes from all the EC2 situations, after which reattaching them. Reservations might be enabled as quickly as you make the primary attachment. In case you are working Home windows Server utilizing AMIs data-stamped 2023.08 or earlier you have to to put in the aws_multi_attach driver as described in AWS NVMe Drivers for Home windows Cases.
Issues to Know
Listed below are a few issues to remember relating to NVMe reservations:
Working System Assist – You should use NVMe reservations with Home windows Server (2016, 2019, and 2022), SUSE SLES 12 SP3 and above, RHEL eight.three and above, and Amazon Linux 2 & later (learn NVMe reservations to be taught extra).
Cluster and Quantity Managers – Home windows Server Failover Clustering is supported; we’re at present working to qualify different cluster and quantity managers.
Costs – There are not any further prices for this characteristic. Every reservation counts as an I/O operation.
— Jeff;
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