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 process 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
E3 ECSs: OLAP and OLTP applications with hyper-threading enabled
Specifications
Table 1 E3 ECS specificationsFlavor
|
vCPUs
|
Memory (GiB)
|
Maximum/Assured Bandwidth (Gbit/s)
|
Maximum PPS (10,000)
|
NIC Multi-Queue
|
Virtualization Type
|
Hardware
|
e3.7xlarge.12
|
28
|
348
|
25/12
|
280
|
8
|
KVM
|
CPU: Intel® Xeon® Skylake 6151
|
e3.14xlarge.12
|
56
|
696
|
25/25
|
500
|
16
|
KVM
|
Notes
- Large-memory ECSs do not support NIC hot swapping.
- E3 ECSs support the following OSs that have been verified:
SUSE Enterprise Linux Server 12 SP2 64bit
SUSE Enterprise Linux Server 12 SP3 64bit
- E3 ECSs can use ultra-high I/O EVS disks as the system disk and data disks.
- The primary and extension NICs of a large-memory ECS have specified application scenarios. For details, see Table 2.
Table 2 Application scenarios of the NICs of a large-memory ECSNIC 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?
An example is provided as follows:
An E3 ECS is to be created. It can have a maximum of 60 attached disks, where:
- The number of system disks is 1.
- The number of EVS disks is at most 59.
The maximum number of disks attached to an existing large-memory ECS remains unchanged. To attach 60 disks, enable advanced disk. For details, see Enabling Advanced Disk.