Server requirements

Storage requirements

The following table lists the minimum and recommended storage requirements according to the disk roles (refer to About the storage cluster):

Disk role	Quantity	Minimum	Recommended
System	One disk per node	100 GB SATA/SAS HDD	250 GB SATA/SAS SSD
Metadata	One disk per node Five disks recommended for one cluster	100 GB enterprise-grade SSD with power loss protection, 1 DWPD endurance minimum
Cache	Optional One SSD disk per 4-12 HDDs	100+ GB enterprise-grade SSD with power loss protection and 75 MB/s sequential write performance per serviced HDD; 1 DWPD endurance minimum, 10 DWPD recommended
Storage	Optional At least one per cluster	100 GB minimum, 16 TB maximum recommended SATA/SAS HDD or SATA/SAS/NVMe SSD (enterprise-grade with power loss protection, 1 DWPD endurance minimum)

CPU and RAM requirements

The following table lists the amount of RAM and CPU cores that will be reserved on one node, according to the services you will use:

Service		Management node		Secondary node
		RAM1 Use only Error correction code (ECC) memory, to avoid data corruption.	CPU cores2 A CPU core here is a physical core in a multicore processor (hyperthreading is not taken into account).	RAM3 Use only Error correction code (ECC) memory, to avoid data corruption.	CPU cores4 A CPU core here is a physical core in a multicore processor (hyperthreading is not taken into account).
System		4.5 GB	3.3 cores	1.5 GB	1.1 cores
Storage services: each disk with Metadata, Storage, or Cache role (any size)5 For clusters larger than 1 PB of physical space, add 0.5 GB of RAM per Metadata service.		0.5 GB	0.2 cores	0.5 GB	0.2 cores
Compute service6 The recommended configuration for a compute cluster node starts with 64+ GB and 16+ cores.		10 GB	4 cores
Load balancer		1.5 GB	0.5 cores
Kubernetes		1 GB	0.5 cores
Backup Gateway7 When working with public clouds and NFS, Backup Gateway consumes as much RAM and CPU as with a local storage.		1 GB	0.5 cores	1 GB	0.5 cores
S3		8 GB	1.7 cores	8 GB	1.7 cores
NFS	Service	1 GB	0.7 cores	1 GB	0.7 cores
	Each share	3 GB	1 core	3 GB	1 core
iSCSI		1 GB	1 core	1 GB	1 core

These reserved values correspond to absolute minimum requirements. In general, the more resources you provide for your cluster, the better it works. All extra RAM is used to cache disk reads, while extra CPU cores increase the performance and reduce latency.

CPU and RAM limits

The following table lists the current RAM and CPU limits for Acronis Cyber Infrastructure servers:

Hardware	Theoretical	Certified
RAM	64 TB	1 TB
CPU	5120 logical CPUs8 A logical CPU is a core (thread) in a multicore (multithreading) processor.	384 logical CPUs9 A logical CPU is a core (thread) in a multicore (multithreading) processor.

CPU recommendations

• CPU frequency affects the cluster performance. Higher CPU frequency reduces latency almost linearly, thus increasing the performance. If other CPU parameters are the same, higher CPU frequency is preferable to a larger number of CPU cores.
• Nodes running the metadata service should have high CPU frequency, because this service is CPU intensive.

Network interface requirements

At least 2 x 10 GbE interfaces are recommended, for internal and external traffic; 25 GbE, 40 GbE, and 100 GbE are even better. Bonding is recommended. However, for external traffic, you can start with 1 GbE links, but they can limit cluster throughput on modern loads.