Ultra-high I/O ECSs

Overview

Ultra-high I/O ECSs use high-performance local NVMe SSDs to provide high storage input/output operations per second (IOPS) and low read/write latency. You can create such ECSs with high-performance local NVMe SSDs attached on the management console.

Ultra-high I/O ECSs can be used for high-performance relational databases, NoSQL databases (such as Cassandra and MongoDB), and ElasticSearch.

Specifications

Table 1 I3 ECS specifications

Flavor

vCPUs

Memory

(GiB)

Max./Assured Bandwidth

(Gbit/s)

Max. PPS

(10,000)

Max. NIC Queues

Max. NICs

Local Disks

(GiB)

Virtualization

i3.2xlarge.4

8

32

15/4.5

150

4

4

1 × 3,200 GiB NVMe

KVM

i3.4xlarge.4

16

64

20/9

280

8

8

2 × 3,200 GiB NVMe

KVM

i3.8xlarge.4

32

128

30/18

550

16

8

4 × 3,200 GiB NVMe

KVM

i3.12xlarge.4

48

192

35/27

750

16

8

6 × 3,200 GiB NVMe

KVM

i3.16xlarge.4

64

256

40/32

1000

32

8

8 × 3,200 GiB NVMe

KVM

Features

Table 2 and Table 3 lists the IOPS performance of local disks and specifications of a single local disk attached to an I3 ECS.

Table 2 IOPS performance of local disks used by I3 ECSs

Flavor

Maximum IOPS for Random 4 KB Read

i3.2xlarge.8

750,000

i3.4xlarge.8

1,500,000

i3.8xlarge.8

3,000,000

i3.12xlarge.8

4,500,000

i3.15xlarge.8

5,250,000

i3.16xlarge.8

6,000,000
Table 3 Specifications of a single local disk attached to an I3 ECS

Metric

Performance

Disk capacity

1.6 TB

IOPS for random 4 KB read

750,000

IOPS for random 4 KB write

200,000

Read throughput

2.9 GiB/s

Write throughput

1.9 GiB/s

Access latency

Within microseconds

Notes

Handling Damaged Local Disks Attached to an ECS of I Series

If a local disk attached to an ECS is damaged, perform the following operations to handle this issue:

For a Linux ECS:

  1. Detach the faulty local disk.
    1. Run the following command to query the mount point of the faulty disk:

      df –Th

      Figure 1 Querying the mount point
    2. Run the following command to detach the faulty local disk:

      umount Mount point

      In the example shown in Figure 1, the mount point of /dev/nvme0n1 is /mnt/nvme0. Run the following command:

      umount /mnt/nvme0

  2. Check whether the mount point of the faulty disk is configured in /etc/fstab of the ECS. If yes, comment out the mount point to prevent the ECS from entering the maintenance mode upon ECS startup after the faulty disk is replaced.
    1. Run the following command to obtain the partition UUID:

      blkid Disk partition

      In this example, run the following command to obtain the UUID of the /dev/nvme0n1 partition:

      blkid /dev/nvme0n1

      Information similar to the following is displayed:

      /dev/nvme0n1: UUID="b9a07b7b-9322-4e05-ab9b-14b8050cd8cc" TYPE="ext4"
    2. Run the following command to check whether /etc/fstab contains the automatic mounting information about the disk partition:

      cat /etc/fstab

      Information similar to the following is displayed:

      UUID=b9a07b7b-9322-4e05-ab9b-14b8050cd8cc    /mnt   ext4    defaults        0 0
    3. If the mounting information exists, perform the following steps to delete it.
      1. Run the following command to edit /etc/fstab:

        vi /etc/fstab

        Use the UUID obtained in 2.a to check whether the mounting information of the local disk is contained in /etc/fstab. If yes, comment out the information. This prevents the ECS from entering the maintenance mode upon ECS startup after the local disk is replaced.

      2. Press i to enter editing mode.
      3. Delete or comment out the automatic mounting information of the disk partition.

        For example, add a pound sign (#) at the beginning of the following command line to comment out the automatic mounting information:

        # UUID=b9a07b7b-9322-4e05-ab9b-14b8050cd8cc    /mnt   ext4    defaults        0 0
      4. Press Esc to exit editing mode. Enter :wq and press Enter to save the settings and exit.
  3. Run the following command to obtain the SN of the local disk:

    For example, if the nvme0n1 disk is faulty, obtain the serial number of the nvme0n1 disk.

    ll /dev/disk/by-id/

    Figure 2 Querying the serial number of the faulty local disk
  4. Stop the ECS and provide the serial number of the faulty disk for technical support to replace the local disk.

    After the local disk is replaced, restart the ECS to synchronize the new local disk information to the virtualization layer.

For a Windows ECS:

  1. Open Computer Management, choose Computer Management (Local) > Storage > Disk Management, and view the disk ID, for example, Disk 1.
  2. Open Windows PowerShell as an administrator and run the following command to query the disk on which the logical disk is created:

    Get-CimInstance -ClassName Win32_LogicalDiskToPartition |select Antecedent, Dependent | fl

    Figure 3 Querying the disk on which the logical disk is created
  3. Run the following command to obtain the serial number of the faulty disk according to the mapping between the disk ID and serial number:

    Get-Disk | select Number, SerialNumber

    Figure 4 Querying the mapping between the disk ID and serial number
  4. Stop the ECS and provide the serial number of the faulty disk for technical support to replace the local disk.

    After the local disk is replaced, restart the ECS to synchronize the new local disk information to the virtualization layer.

Parent topic: ECS Specifications and Types