Large-Memory ECSs

Overview

Large-memory ECSs provide an even larger amount of memory than memory-optimized ECSs. They are used for applications that require a large amount of memory, rapid data switching, low latency, and capability of processing large volumes of data. Large-memory ECSs provide large memory and high computing, storage, and network performance.

Applications
Large-memory ECSs are suitable for applications that require a large amount of memory, rapid data switching, and low latency, and process large volumes of data.
Application scenarios
OLTP and OLAP scenarios

Specifications

**Table 1** E3 ECS specifications
Flavor	vCPUs	Memory (GiB)	Max./Assured Bandwidth (Gbit/s)	Max. PPS (10,000)	Max. NIC Queues	Max. NICs	Virtualization
e3.7xlarge.12	28	348	25/12	280	8	8	KVM
e3.14xlarge.12	56	696	25/25	550	16	8	KVM
e3.26xlarge.14	104	1466	30/20	550	16	8	KVM
e3.52xlarge.14	208	2932	40/40	1,000	32	8	KVM

Notes

Large-memory ECSs do not support NIC hot swapping.
Affected by the memory loading speed, large-memory ECSs may take longer to start.

The primary and extension NICs of a large-memory ECS can only be used in the scenarios listed in Table 2.

**Table 2** Application scenarios of the NICs of a large-memory ECS
NIC Type	Application Scenario	Remarks
Primary NIC	Vertical layer 3 communication	N/A
Extension NIC	Horizontal layer 2 communication	To improve network performance, you can set the MTU of an extension NIC to 8888.

An ECS can have a maximum of 60 attached disks, including the system disk. For details about constraints, see Can I Attach Multiple Disks to an ECS?
For example, an E3 ECS can have one system disk and 59 EVS disks.