MRS uses ECSs of the following types in different application scenarios.

AB.C.D

Example: m3.8xlarge.8

In the preceding flavor:

A specifies the ECS type. For example, s indicates a general-purpose ECS, c a computing ECS, and m a memory-optimized ECS.
B specifies the type ID. For example, the 1 in s1 indicates a general-purpose first-generation ECS, and the 2 in s2 indicates a general-purpose second-generation ECS.
C specifies a flavor size and can be any of the following options: medium, large, and xlarge.
D specifies the ratio of memory to vCPUs expressed in a digit. For example, value 4 indicates that the ratio of memory to vCPUs is 4.

**Table 1** S1 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
S1	4	16	s1.xlarge.linux.mrs	XEN
	16	64	s1.4xlarge.linux.mrs	XEN
	32	128	s1.8xlarge.linux.mrs	XEN

**Table 2** S3 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
S3	4	8	s3.xlarge.2.linux.mrs	XEN
	4	16	s3.xlarge.4.linux.mrs	XEN
	8	16	s3.2xlarge.2.linux.mrs	XEN
	8	32	s3.2xlarge.4.linux.mrs	XEN
	16	32	s3.4xlarge.2.linux.mrs	XEN

**Table 3** C2 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
C2	8	16	c2.2xlarge.linux.mrs	KVM
C2	16	32	c2.4xlarge.linux.mrs	KVM

**Table 4** General computing-plus (C3) ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
C3	8	16	c3.2xlarge.2.linux.mrs	KVM
	4	16	c3.xlarge.4.linux.mrs	KVM
	8	32	c3.2xlarge.4.linux.mrs	KVM
	16	32	c3.4xlarge.2.linux.mrs	KVM
	16	64	c3.4xlarge.4.linux.mrs	KVM
	32	128	c3.8xlarge.4.linux.mrs	KVM
	60	256	c3.15xlarge.4.linux.mrs	KVM

**Table 5** C4 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
C4	4	16	c4.xlarge.4.linux.mrs	KVM
	8	16	c4.2xlarge.2.linux.mrs	KVM
	8	32	c4.2xlarge.4.linux.mrs	KVM
	16	32	c4.4xlarge.2.linux.mrs	KVM
	16	64	c4.4xlarge.4.linux.mrs	KVM
	32	64	c4.8xlarge.2.linux.mrs	KVM
	32	128	c4.8xlarge.4.linux.mrs	KVM
	64	256	c4.16xlarge.4.linux.mrs	KVM

**Table 6** C6 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
c6	8	32	c6.2xlarge.4.linux.mrs	KVM
	16	64	c6.4xlarge.4.linux.mrs	KVM
	32	64	c6.8xlarge.2.linux.mrs	KVM
	32	128	c6.8xlarge.4.linux.mrs	KVM
	64	128	c6.16xlarge.2.linux.mrs	KVM
	64	256	c6.16xlarge.4.linux.mrs	KVM

**Table 7** D1 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type	Local Disk (GB)	Hardware
D1	44	3232	d1.xlarge.mrslinux.mrs	KVM	3×1800	CPU: Intel® Xeon® Gold 6151 Processor v5 Memory: 20 × 32 GB
	88	6464	d1.2xlarge.mrslinux.mrs	KVM	6×1800
	16	128	d1.4xlarge.linux.mrs	KVM	12×1800
	36	256	d1.8xlarge.linux.mrs	KVM	24×1800

**Table 8** D2 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type	Local Disk (GB)	Hardware
D2	4	32	d2.xlarge.8.linux.mrs	KVM	2×1800	CPU: Intel® Xeon® Gold 6151 Processor v5 Memory: 20 × 32 GB
	8	64	d2.2xlarge.8.linux.mrs	KVM	4×1800
	16	128	d2.4xlarge.8.linux.mrs	KVM	8×1800
	32	256	d2.8xlarge.8.linux.mrs	KVM	16×1800

**Table 9** H1 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
H1	8	32	h1.2xlarge.4.linux.mrs	KVM
	16	64	h1.4xlarge.4.linux.mrs	KVM
	32	128	h1.8xlarge.4.linux.mrs	KVM

**Table 10** M3 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
M3	8	64	m3.2xlarge.8.linux.mrs	KVM
	16	128	m3.4xlarge.8.linux.mrs	KVM
	32	256	m3.8xlarge.8.linux.mrs	KVM

**Table 11** M4 ECS specifications
Type	vCPUs	Memory (GB)	Flavor	Virtualization Type
M4	8	64	m4.2xlarge.8.linux.mrs	KVM
	16	128	m4.4xlarge.8.linux.mrs	KVM
	32	256	m4.8xlarge.8.linux.mrs	KVM
	64	512	m4.16xlarge.8.linux.mrs	KVM

ECS Specifications Used by MRS