3.2. Compute Resource (Dedicated Device)¶
Compute Resource (Dedicated Device) is a service that provides virtual equipment (Compute Resources) by combining CPUs, Memory, and Disks to create Virtual Machines. Compute Resources are provided by virtualizing physical servers and storage devices within a physical enclosure dedicated to you.
You can use multiple dedicated devices in the Data Center that you are using.
3.2.1. Available Features¶
You can use the following features in Compute Resource (Dedicated Device).
| Feature | Overview | |
| 1 | Provision of Compute Resource Pools | You can create and use multiple Compute Resource Pools (CPU/Memory/Disk) to create a Virtual Machine.
However, in Compute Resource you use your own dedicated physical servers and storage devices provided by NTT Communications.
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| 2 | Features for controlling Compute Resource Pools | You can perform the following actions for Compute Resource Pools.
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Note
- Compute Resource (Dedicated Device) is a service that provides the same features as Compute Resource, the service in which physical equipment is shared with other users. This section explains the differences between the two services. For information regarding Compute Resource, refer to “3.1 Compute Resource”.
- You can select storage devices from a storage class (Premium or Premium+) that offers the appropriate performance level for your intended use.
3.2.2. Provision of Compute Resource Pools¶
In Compute Resource (Dedicated Device), you can use Compute Resources (CPU/Memory/Disk) that are comprised of your own dedicated physical servers and storage devices provided by NTT Communications. In addition, you can divide your Compute Resources into multiple Compute Resource Pools.
To add, delete, or change a Compute Resource Pool, please submit the application specified separately.
Important
- You may not be able to add, delete, or change a Compute Resource Pool, depending on the compute resource usage conditions.
You can add or reduce the physical servers (regular servers and standby servers) and storage devices handled by dedicated devices within the ranges shown below.
To add, delete, or change a physical server, please submit the application specified separately.
| Dedicated Device | Lower Limit | Upper Limit | Application Unit |
| Regular servers | 1 | 18 | 1 |
| Standby server | 1 | 2 | 1 |
| Storage device | 1 | 1 | - |
Important
- In Compute Resource (Dedicated Device), the physical server is combined with an HA cluster configuration. You therefore need a total of two servers, one regular server and one standby server, as the minimum configuration for one dedicated device.
- You may not be able to add or delete a physical server, depending on the compute resource usage conditions.
The amount of resource that could be distributed to each compute resource pool from the dedicated device is as follows.
| Resource | Minimum | Maximum | Unit |
| CPU | 1 GHz | Total amount of CPU resource of HA Cluster [Active Server] | 1 GHz |
| Memory | 1 GB | Total amount of Memory resource of HA Cluster [Active Server] | 1 GB |
| Disk | 50 GB | Disk resource of Storage Device | 50 GB |
Note
- There is no limit for total disk capacity. However, the total disk capacity (no limit) + Memory Resource (different for each Compute Class) must be below the amount of space left in storage resource.
Classes The Compute Resource Pool is comprised of two classes: a Compute Class (CPU and Memory) provided by a physical server, and a storage class (Disks) provided by a storage device. You can choose from three different service class (Small/Medium/Large) that has different resource capacity. Storage classes are separated into two types of service classes (Premium and Premium+) with different levels of Disk performance. You can select the class that is appropriate for your intended use.
| Classes | Resource | Service Class | Details |
|---|---|---|---|
| Compute Class(Physical server) | CPU Memory | Small | The Physical Server of Small is the smallest. The physical server of Small provides smaller CPU Resourceand Memory Resource than Medium. |
| Medium | The Physical Server of Medium is larger than that of Small and smaller than that of Large. The physical server of Medium provides larger CPU Resourceand Memory Resource than Small. | ||
| Large | The Physical Server of Large is the largest. The Physical Server of Large provides the largest CPU Resource and Memory. The CPU performance is higher than that of Medium. | ||
| Storage Class(Storage device) | Disk | Premium | Provides a Disk resource with high-speed Disk performance (equivalent to iSCSI). |
| Premium+ | Provides a Disk resource with faster Disk performance than Premium (equivalent to FC). |
Physical server performance
The physical configurations of one physical server that are provided are shown below.
| Generation | Class | Number of physical CPU sockets | Total of physical CPU cores | CPU*(GHz) | Memory*(GB) | CPU processing capacity |
|---|---|---|---|---|---|---|
| Generation1 | Small | 2 | 16 | 32 | 128 | Intel Xeon2.0GHz |
| Medium | 4 | 32 | 70.4 | 192 | Intel Xeon2.0GHz | |
| Large | 4 | 32 | 86.4 | 768 | Intel Xeon2.0GHz | |
| Generation2 | Small | 2 | 16 | 41.6 | 128 | Intel Xeon2.6GHz |
| Medium | 4 | 32 | 83.2 | 192 | Intel Xeon2.6GHz | |
| Large | 4 | 32 | 83.2 | 768 | Intel Xeon2.6GHz | |
| Generation3 | Small | 2 | 16 | 38.4 | 128 | Intel Xeon2.4GHz |
| Medium | 4 | 40 | 80 | 192 | Intel Xeon2.0GHz | |
| Large | 4 | 40 | 80 | 768 | Intel Xeon2.0GHz |
* About 10%-15% overhead is required for virtualization. So Customer can use the following amount resource approximately. As of February, 2015.
Available Resource by 1 physical server (as of December 2015)
| Generation | Class | CPU Resource(GHz) | Memory Resource(GB) |
|---|---|---|---|
| Generation1 | Small | 27 | 115 |
| Medium | 65 | 182 | |
| Large | 80 | 730 | |
| Generation2 | Small | 35 | 115 |
| Medium | 75 | 176 | |
| Large | 75 | 729 | |
| Generation3 | Small | 32 | 115 |
| Medium | 72 | 176 | |
| Large | 72 | 729 |
Note
- The processing capacity of a CPU that provides 1 GHz of CPU resource is equivalent to the processing capacity when the physical processor above operates at 1 GHz.
- In Compute Resource (Dedicated Device), you can set three parameters for the CPU resources, Memory resources, and Disk resources in order to effectively utilize the resources that can be assigned to the Virtual Machine. For details, refer to “3.2.3 Parameter Settings for Resources“
Disk resources provided by the storage device
For storage devices, you can select the storage class and plan that is appropriate for your intended use.
The storage devices and resources that can be selected when you start using the equipment are shown below.
| Storage Class | Plans | Disk Resources |
|---|---|---|
| Premium | 3 TB | 3,072 GB |
| 6 TB | 6,144 GB | |
| 9 TB | 9,216 GB | |
| 12 TB | 12,288 GB | |
| 15 TB | 15,360 GB | |
| 18 TB | 18,432 GB | |
| 21 TB | 21,504 GB | |
| 24 TB | 24,576 GB | |
| Premium+ | 3 TB | 3,072 GB |
| 6 TB | 6,144 GB | |
| 9 TB | 9,216 GB | |
| 12 TB | 12,288 GB | |
| 15 TB | 15,360 GB | |
| 18 TB | 18,432 GB | |
| 21 TB | 21,504 GB | |
| 24 TB | 24,576 GB |
[Reference] Target I/O performance for each storage class
| Interface | Target I/O Performance | |
| Premium | Equivalent to iSCSI | Approx. 8,300 IOPS/24 TB, approx. 1,800 IOPS/3 TB |
| Premium+ | Equivalent to Fiber Channel | Approx. 18,600 IOPS/24 TB, approx. 5,700 IOPS/3 TB |
IOPS is one performance measure for Memory devices (such as hard Disks).
It is the number of times that a read/write can be performed in one second under certain conditions. The IOPS values above are the performance values measured under the following conditions.
| Measurement condition | One Virtual Machine was created in a Compute Resource Pool, benchmarking was performed multiple times, and the average value was calculated. | |
| Virtual machine conditions | vCPU | 8 |
| Memory | 16 GB | |
| Guest OS | Red Hat Enterprise Linux 6.2 | |
| Benchmark tool | fio | |
| Settings parameters | direct=1 (measured in unbuffered I/O) runtime=300 (measurement time is 300 seconds) size=16GB (test file size is 16 GB) readwrite=RandomReadWrite (measured in random read/writes) rwmixread=50 (read/write ratio is 50:50) blocksize=4k (block size is 4 kbyte) |
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The same HA Cluster feature that is provided in Compute Resource is also provided in Compute Resource. For details regarding the HA Cluster feature, refer to “HA Cluster Feature”.
You can have multiple dedicated devices by reserving multiple Compute Resources (Dedicated Device).
To add or delete a dedicated device, please submit the application specified separately.
Important
- To delete a dedicated device, first delete all Virtual Machines that use Compute Resources on the dedicated device that you are deleting.
3.2.3. Parameter Settings for Resources¶
In Compute Resource (Dedicated Device), you can set limit value for the CPU resources, Memory resources, and Disk resources in order to effectively utilize the resources that can be assigned to the Virtual Machine Service Order form is needed for setting.
The items marked with a “Y” are items that can be set. For example, a limit value can be set for CPU resources and Memory resources.
| Item | Description | CPU | Memory | Disk |
| Limit value | Sets the upper limit of the resources that a Compute Resource Pool can use. | Y | Y | - |
| Reservation rate | Sets the percentage value of the reservation value for the limit value. | Specified by NTT Communications | Specified by NTT Communications | - |
| Reservation value | Sets the resource value that the Compute Resource Pool can definitely use. | Specified by NTT Communications | Specified by NTT Communications | Y |
You can add or reduce CPU resources within the ranges shown below.
| Lower Limit | Upper Limit | Setting Unit | |
| Limit value | 1 GHz | The resource value provided by the HA cluster | 1 GHz |
You can add or reduce Memory resources within the ranges shown below.
| Lower Limit | Upper Limit | Setting Unit | |
| Limit value | 1 GB | The resource value provided by the HA cluster | 1 GB |
You can add or reduce Disk resources within the ranges shown below.
| Lower Limit | Upper Limit | Setting Unit | |
| Reservation value | 50 GB | Disk resources provided by the storage device | 1 GB |
Important
- The total of the Disk resource reserved rates for all Compute Resources that belong to the same storage device cannot exceed the Disk resources provided by that storage.
Note
- The Disk resources listed in the Customer Portal may vary slightly from the values in the table.
- Disk performance varies according to the storage class. For details, refer to “Class”.
3.2.4. Assigning Resources to a Virtual Machine¶
Create a Virtual Machine by assigning resources in a Compute Resource Pool (CPUs/Memory/Disk) to the Virtual Machine.
The quantities of vCPUs that can be assigned to one Virtual Machine are shown below.
Customer Portal ver2.0
| Service Menu | Compute Class | Min | Max | Step |
|---|---|---|---|---|
| Compute Resource (Dedicated Device) | Small | 1 | 16 | 1 |
| Medium | 1 | 32 | 1 | |
| Large | 1 | 32 | 1 |
Note
- The number of vCPU is up to 8 if virtual hardware version is 7. Please mark this specification when Virtual Machine image is imported.
You can add or reduce the Memory capacity that is assigned to one Virtual Machine within the ranges shown below.
Customer Portal ver2.0
| Service Menu | Compute Class | Min | Max | Step |
|---|---|---|---|---|
| Compute Resource (Dedicated Device) | Small | 1 | 96 | 1 |
| Medium | 1 | 128 | 1 | |
| Large | 1 | 512 | 1 |
Note
- It is possible to allocate Memory to 255GB if virtual hardware version is 7. Please mark this specification when Virtual Machine image is imported.
You can add or reduce the Disk capacity and the number of data Disks connected to one Virtual Machine within the ranges shown below.
Customer Portal ver2.0
| Lower Limit | Upper Limit | Setting Unit | |
|---|---|---|---|
| Number of data Disks | 0 | 59 | 1 |
| Disk capacity | 1 GB | 2,047 GB | 1 GB |
| 1 MB | 2,097,151 MB | 1 MB |
Note
- The total disk capacity that could be assigned must be the amount which subtracts the memory capacity assigned to Virtual Machine from the leftover disk capacity of Compute Resource Pool.
- In case of using 6TB Storage plan if the leftover of Storage Resource for Compute Resource Pool is 6,000GB, and 128GB memory is being mounted, the maximum of total disk capacity is 5,872GB (= 6,000-128).For example:Root disk:80GBData disk1:2000GBData disk2:2000GBData Disk3:1872GB
3.2.5. Important Points¶
- You cannot “change the storage class (Premium or Premium+)” or “add one or more storage devices.” You therefore need to consider your future storage usage plan when selecting a storage class at the time of your application.
- You can “change your storage device plan (add a Disk resource). However, you cannot change to a plan that decreases the Disk resource value.
- If you “change your storage device plan,” the date that the change application takes effect becomes the new starting date for calculating the minimum usage period for your contract.
- Different Compute Class (Small, Medium, Large) and generation cannot create the same cluster. The same class and generation of the physical server can be added within the limit range.
- Please refer to “Service provided in each Data Center”.
- New sale of Compute Resource (Dedicated Device) below is or will be suspended.
- Generation1 all Class
- Genaration2 all Class