Elastic Volume Service (EVS)

Clouds decouple computing and storage resources from the associated physical hardware. This allows you to easily scale your cloud infrastructure and components separately from one another. Storage is one of the main parts of your cloud server and is where your operating system and application data lie, making it an essential component within your cloud infrastructure.

The Open Telekom Cloud Elastic Volume Service (EVS) is the scalable block storage solution for your Elastic Cloud Server (ECS) or Bare Metal Server (BMS). Multiple disk types are available, allowing you to make use of the most cost-efficient disk for your type of application. EVS disks are easily scalable and enable you to attach up to 60 of them to your servers. It is even possible to share EVS disks across up to 16 servers. Disks start at 10 GB and can be scaled up to 32 TB per disk.

Elastic Volume Service in the Open Telekom Cloud

Reasons for EVS in the Open Telekom Cloud

Compliant

EVS data is stored in the Deutsche Telekom's datacenters. These run in Europe and comply with GDPR (General Data Protection Regulation) requirements, ensuring that services built on top of the Open Telekom Cloud are easily and heedlessly GDPR-compliant.

Reliable & durable

EVS disks achieve an availability of 99.95% and a durability of up to 99.9999999% (9 nines), ensuring that your data is available, accessible and protected against loss and corruption. If you need more protection, you can make use of the backup functionality that allows you to store backups in multiple availability zones.

Cost & performance optimized

EVS disks can be selected as different disk types. This allows you to select the type that perfectly fits your performance demands and needs, meaning you can set up a cost-efficient service and only pay for the performance you really need.

Scalable & shareable

Disks can be scaled to up to 32 TB per disk in convenient 1 GB steps without any service interruption. With the “advanced disk” functionality enabled on your ECS, it is possible to attach up to 60 disks to your ECS instance. In addition, EVS disks can be shared with up to 16 servers.

Key Features of EVS

Shared EVS disks

Shared EVS disks allow you attach a disk to multiple ECSs or BMSs, sharing access to the disk across multiple servers (up to 16 at a time). Concurrent read/write operations can be executed. Usually, shared disks are used in business-critical applications that require a cluster deployment for high availability. With the usage of shared disks, you can generate much higher IOPS and provide a better performance to your application.

Encryption

The EVS provides an encryption functionality that will automatically encrypt your data on your newly created file systems. The encryption service is provided via the Key Management Service (KMS)which uses the industry standard XTS-AES-256 encryption algorithm.

Backup

The Cloud Backup & Recovery (CBR) allows you to directly create backups for your EVS disks while your servers are running. This ensures your disks are protected against data loss or damage due to viruses, mis-operations, faulty software or hardware failure. The CBR service automatically stores your backup in multiple availability zones (AZs) of the Open Telekom Cloud, so your backup is available even in case of an outage of an entire AZ.

Snapshots

EVS allows you to create snapshots for your disks, which are images of disk data from a specific point in time. In case of misoperations, software related faults, accidental deletion or overwriting, snapshots can be used to restore your data to a specific point in time. In addition, snapshots can be used to create new disk. Snapshot data is stored directly on your EVS disk, while backups are stored on the Object Storage Service (OBS) using multiple Open Telekom Cloud AZs, therefore providing higher redundancy.

EVS disk types

	Common I/O (SATA)	High I/O (SAS)	General Purpose SSD (SSD)	Ultra-High I/O (SSD)	Extreme SSD (SSD)
Use case	Disks suitable for less accessed workloads like light-weight test and development environments	Disks suitable for commonly accessed workloads like mid-sized development & test environments	Cost-effective disks designed for enterprise applications like web-apps and medium sized databases	High performance disks for mission critical data like transcoding, databases and applications requiring low latency	Superfast disks for workloads demanding highest performance like databases or artificial intelligence
Capacity per disk	10 GB – 32 TB	10 GB – 32 TB	10 GB – 32 TB	10 GB – 32 TB	10 GB – 32 TB
Max. IOPS per disk	1,000	3,000	20,000	20,000	128,000 (BMS) 100,000 (ECS)
Disk IOPS	100 + 1 x Capacity (GB)	100 + 2 x Capacity (GB)	1,800 + 12 x Capacity (GB)	100 + 50 x Capacity (GB)	1,800 + 50 x Capacity (GB)
Max. throughput per disk	90 MB/s	150 MB/s	250 MB/s	350 MB/s	1 GB/s
Disk Throughput	90 MB/s	100 + 0.15 x Capacity (GB)	100 + 0.5 x Capacity (GB)	120 + 0.5 x Capacity (GB)	120 + 0.5 x Capacity (GB)
Latency	10 – 15 ms	6 – 10 ms	1 ms	1 – 3 ms	< 1 ms
Durability	Up to 99.9999999% (9x9)	Up to 99.9999999% (9x9)	Up to 99.9999999% (9x9)	Bis zu 99,9999999% (9x9)	Up to 99.9999999% (9x9)
Availability	99.95%	99.95%	99.95%	99.95%	99.95%

Structure and Function

Use Cases

High-Performance Computing

Extreme SSD EVS disks are ideal for HPC applications. Those disks offer highest read/write performance paired with throughput & latency. Usage of Extreme SSD disks fulfill HPC scenarios.

Enterprise Applications

EVS disks are ideal for enterprise applications like SAP, Microsoft Exchange and Microsoft SharePoint. Thanks to the existence of multiple disk types, you can select the desired type for your performance needs and deliver a cost-efficient service.

NoSQL & Relational Databases

Extreme SSD EVS disks are the perfect fit to read/write intensive & latency sensitivity databases like SQL, MySQL or SAP HANA. Those disks provide low latency and ensure your service will respond quickly & reliably. Scaling is not an issue when addressing your performance requirements.

Development & test environments

In development and test environments, you need the most cost-efficient storage solution. For this purpose, the Common I/O and High I/O disk types may be a perfect fit to fulfil your development and test requirement needs, depending on the size of your development & testing projects.

New Features

08/08/2023IAM's access permissions for the EVS are now also available in the NL regionView Details

10/19/2023Migration of Backups for ServerView Details

06/03/2024GP SSD available in EU-DE and adoption of EVS specsView Details

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