M4 ECSs use second-generation Intel® Xeon® Scalable processors with technologies optimized to offer powerful and stable computing performance. Using 25GE high-speed intelligent NICs, M4 ECSs provide a maximum memory size of 512 GiB based on DDR4 for memory-intensive applications with high requirements on network bandwidth and Packets Per Second (PPS).
M3 ECSs are developed based on the KVM virtualization platform and designed for processing large-scale data sets in the memory. They use Intel® Xeon® Scalable processors, network acceleration engines, and DPDK rapid packet processing mechanism to provide higher network performance and up to 512 GiB of DDR4 memory for memory-intensive computing applications.
M2 ECSs use Intel Xeon E5-2690 v4 CPUs and are designed for memory-optimized applications.

**Table 1** M4 ECS specifications
Flavor	vCPUs	Memory (GiB)	Max./Assured Bandwidth (Gbit/s)	Max. PPS (10,000)	Max. NIC Queues	Max. NICs	Virtualization	Hardware
m4.large.8	2	16	4/1.2	40	2	2	KVM	CPU: Intel® Xeon® Cascade Lake 6266
m4.xlarge.8	4	32	8/2.4	80	2	3	KVM
m4.2xlarge.8	8	64	15/4.5	150	4	4	KVM
m4.3xlarge.8	12	96	17/7	200	4	6	KVM
m4.4xlarge.8	16	128	20/9	280	8	8	KVM
m4.6xlarge.8	24	192	25/14	400	8	8	KVM
m4.8xlarge.8	32	256	30/18	550	16	8	KVM
m4.16xlarge.8	64	512	40/36	1000	32	8	KVM

**Table 2** M3 ECS specifications
Flavor	vCPUs	Memory (GiB)	Max./Assured Bandwidth (Gbit/s)	Max. PPS (10,000)	Max. NIC Queues	Max. NICs	Virtualization	Hardware
m3.large.8	2	16	1.5/0.6	30	2	12	KVM	CPU: Intel® Xeon® Skylake 6151
m3.xlarge.8	4	32	3/1.1	50	2	12	KVM
m3.2xlarge.8	8	64	5/2	90	4	12	KVM
m3.4xlarge.8	16	128	10/4.5	130	4	12	KVM
m3.8xlarge.8	32	256	15/9	260	8	12	KVM
m3.15xlarge.8	60	512	17/17	500	16	12	KVM

**Table 3** M2 ECS specifications
Flavor	vCPUs	Memory (GiB)	Max./Assured Bandwidth (Gbit/s)	Max. PPS (10,000)	Max. NIC Queues	Virtualization	Hardware
m2.4xlarge.8	16	128	8/5	40	4	KVM	CPU: Intel® Xeon® Processor E5-2690 v4
m2.8xlarge.8	32	256	13/8	60	8	KVM	CPU: Intel® Xeon® Processor E5-2690 v4

High-performance relational (MySQL) and NoSQL (MongoDB and Cassandra) databases
Distributed web scale cache stores that provide in-memory caching of key-value type data (Memcached and Redis)
Applications processing big unstructured data in real time (financial services, Hadoop/Spark clusters)
High-performance computing (HPC) and electronic design automation (EDA)

Table 4 lists the OSs supported by memory-optimized ECSs.

**Table 4** Supported OS versions
OS	Version
Alma	Alma 8 64bit
CentOS	CentOS Stream 8.6 64bit CentOS 7.9 64bit CentOS 7.7 64bit
Debian	Debian GNU/Linux 11 64bit Debian GNU/Linux 10 64bit
EulerOS	EulerOS 2.5 64bit
Fedora	Fedora 35 64bit Fedora 34 64bit Fedora 33 64bit
OpenSUSE	OpenSUSE 15.3 64bit
Oracle Linux	Oracle Linux Server release 8.4 64bit Oracle Linux Server release 7.6 64bit
Red Hat	Red Hat Enterprise Linux 7.9 64bit Red Hat Enterprise Linux 6.10 64bit
Rocky	Rocky 8 64bit
SUSE	Novell SUSE Linux Enterprise Server 15 SP3 64bit Novell SUSE Linux Enterprise Server 15 SP2 64bit Novell SUSE Linux Enterprise Server 15 SP1 64bit Novell SUSE Linux Enterprise Server 15 64bit Novell SUSE Linux Enterprise Server 12 SP5 64bit Novell SUSE Linux Enterprise Server 12 SP4 64bit Novell SUSE Linux Enterprise Server 12 SP3 64bit
SUSE-SAP	Novell SUSE Linux Enterprise Server 15 SP3 64bit Novell SUSE Linux Enterprise Server 15 SP2 64bit Novell SUSE Linux Enterprise Server 15 SP1 64bit Novell SUSE Linux Enterprise Server 15 64bit Novell SUSE Linux Enterprise Server 12 SP5 64bit Novell SUSE Linux Enterprise Server 12 SP4 64bit Novell SUSE Linux Enterprise Server 12 SP3 64bit
Ubuntu	Ubuntu 20.04 server 64bit Ubuntu 18.04 server 64bit
Windows	Windows Server 2019 Standard 64bit Windows Server 2016 Standard 64bit Windows Server 2012 R2 Standard 64bit
openEuler	openEuler 20.03 64bit

Memory-optimized ECSs