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doc-exports/docs/evs/umn/evs_01_0102.html
lizaoxu 001a9c5e70 EVS UMN Update 
Reviewed-by: Muller, Martin <martin.muller@t-systems.com>
Co-authored-by: lizaoxu <lizaoxu@huawei.com>
Co-committed-by: lizaoxu <lizaoxu@huawei.com>
2025-07-11 13:44:58 +00:00

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EVS Concepts

Table 1 EVS concepts

Concept

Description

Reference

IOPS

Number of read/write operations performed by an EVS disk per second.

Disk Types and Performance

Throughput

Amount of data read from and written into an EVS disk per second.

Read/write I/O latency

Minimum interval between two consecutive read/write operations of an EVS disk.

Burst capability

A small-capacity disk can surpass its official maximum IOPS for a short period of time.

VBD

A device type of EVS disks. VBD EVS disks only support basic SCSI read/write commands.

Device Types

SCSI

A device type of EVS disks. SCSI EVS disks support transparent SCSI command transmission and allow the server OS to directly access the underlying storage media.
Parent topic: Basic Concepts