Restrictions on creating a disk domain across engines in the OceanStor V3 Series

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Currently, cross-engine disk domain creation based on IP scale-out is not recommended. You are advised to create a disk domain on one engine. If you want to create a disk domain across engines, evaluate your service performance and ensure that the bandwidth does not exceed 10GE and the latency meets your service requirements.

Other related questions:
Note information when creating disk domains on OceanStor V3
1. You are advised to create different disk domains for various services that have different I/O models. 2. Configuring the disk domain across engines is not recommended. 3. At the same tier of a disk domain, the capacity of each disk must be the same. 4. You can use eDesigner to calculate the number of disks in a disk domain according to customers' performance requirements. Please visit http://app.huawei.com/unistar/edesigner/solutionAction!showHome.action?CsrfToken=f46c693ceaa6498b844726e325e435f1

Whether an entire disk domain fails to work if the engine of a V3 series unified storage system is faulty and if the disk domain crosses multiple engines
In this case, some disks in the disk domain can be read and written. If a host requests to access data on the faulty engine, a read/write failure message is returned.

Recommended number of disks in each disk domain of the OceanStor V3 storage
Each tier under each disk domain has a maximum of 50 disks. Each disk domain has fewer than 100 disks.

Principles and impact of expanding disk domains of OceanStor V3 storage systems
After the new disks are added to a disk domain, the system automatically performs migration to ensure that the used capacity of each disk is the same. The migration speed is related to the load of the disk domain. For example, if the I/O load on the disk domain is heavy, the migration speed is reduced; if the I/O load on the disk domain is light, the migration speed is relatively high. The migration speed has no major impact on the performance of a disk domain. However, it is still recommended to perform migration when the service load is light.

Restrictions on hybrid configuration of high-density disk enclosures and common disk enclosures in the OceanStor V3 Series
There is no restriction on hybrid configuration of high-density disk enclosures and common disk enclosures. However, the performance may be adversely affected because two SAS cables are applied to each high-density disk enclosure while only one SAS cable is applied to each common disk enclosure and the transfer rates are different.

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