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Remote Replication Feature Guide for File 04

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R002

"This document describes the file system remote replication feature, in terms of the implementation principle,application scenario, and explains how to configure and manage this feature."
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Restrictions

Restrictions

This section describes the impact of the remote replication feature on system performance, and restrictions on the remote replication feature.

Impact on Host Performance

Data is periodically synchronized from the primary site to the secondary site, affecting host performance. In the event of a disaster, the amount of lost data is subject to the synchronization period. (A longer synchronization period leads to more lost data.) I/O requests delivered by a host are processed only at the primary site. At the start of the user-defined synchronization period, data synchronization is automatically initiated between the primary site and the secondary site. After completing the I/O processing, the primary site immediately returns a response to the host indicating that the I/O processing is complete.

Interaction with Other Features and Functions (Where Remote Replication Is Configured Earlier than Other Features and Functions)

Table 1-4 describes the interaction relationship between the file system remote replication feature and other features/functions, where file system remote replication is configured earlier than other features and functions on the storage system.
Table 1-4  Interaction relationship between the file system remote replication feature and other features/functions (where the former is configured earlier than the latter)
NOTE:
  • Table 1-4 indicates whether the primary or secondary file system in a remote replication can be configured as a file system in a feature in the first column or configured with a feature or function in the first column.
  • indicates that the primary or secondary file system in a remote replication can be configured as a file system in a feature in the first column or configured with a feature or function in first column, and × indicates that the primary or secondary file system in a remote replication cannot be configured as a file system in a feature in the first column or configured with a feature or function in the first column.

File System Used in Another Feature or Function

Primary File System in a Remote Replication

Secondary File System in a Remote Replication

WORM

×

×

SmartPartition

SmartQuota

SmartCache

SmartDedupe&SmartCompression

VAAI

SmartQoS

Source file system in the snapshot feature

File system snapshot

×

×

Primary file system in a remote replication

×

×

Secondary file system in a remote replication

×

×

File system sharing

NOTE:

The secondary file system in a remote replication can be shared. Because the secondary file system in a remote replication is unreadable and unwritable, if no read or write I/Os are processed during the sharing, the sharing is successful. If read or write I/Os are processed, the sharing fails. Therefore, disable write protection for the secondary file before sharing it.

Interaction with Other Features and Functions (Where File System Remote Replication Is Configured Later than Other Features and Functions)

Table 1-5 describes the interaction relationship between the file system remote replication feature and other features/functions, where the file system remote replication feature is configured later than other features and functions on the storage system.
Table 1-5  Interaction relationship between the file system remote replication feature and other features/functions (where the former is configured later than the latter)
NOTE:
  • Table 1-5 indicates whether a file system configured with a feature or function in the first column can act as the primary or secondary file system in a remote replication.
  • In the following table, indicates that the corresponding file system in first column can act as the primary or secondary file system in a remote replication, and × indicates that the corresponding file system in the first column cannot act as the primary or secondary file system in a remote replication.

File System Used in Another Feature or Function

Primary File System in a Remote Replication

Secondary File System in a Remote Replication

File system configured with WORM

File system configured with SmartPartition

File system configured with SmartQuota

×

File system configured with SmartCache

File system configured with SmartDedupe&SmartCompression

File system configured with VAAI

×

File system configured with SmartQoS

Source file system in the snapshot feature

×

File system snapshot

×

×

Primary file system in a remote replication

×

×

Secondary file system in a remote replication

×

×

File system shared to a host

NOTE:
A newly created file system can be shared and is used as the secondary file system of a remote replication. If data is written to the file system during the sharing, the file system has data and therefore cannot be used as the file system of a remote replication.

If an existing file system is used as the secondary or target file system in a value-added feature, it is possible that data is overwritten. Therefore, you must exercise caution.

Application Restrictions

  • Only replication of an entire file system is supported.
  • Only replication of a single file system is supported.
  • Data of snapshots for a file system are not replicated to a remote site when the file system is replicated.
  • Read-only snapshots of a file system cannot be replicated.
  • Quota information cannot be replicated from the primary file system to the secondary file system. You must manually configure the quota information for the secondary file system.
  • The WORM properties of primary and secondary file systems are the same.
  • The secondary file system must be a new one. Files, directories, snapshots, quota trees, and quotas must not have been created for the new secondary file system. In addition, the primary and secondary file systems must have the same capacity. If a snapshot reservation space or a deduplication or compression feature is configured for a file system, the available capacity of the file system is affected. If the available capacity of the secondary file system is smaller than that of the primary file system and the capacity of the secondary file system becomes insufficient during the data synchronization, the remote replication relationship will be interrupted.
  • After a remote replication is created, the secondary file system is unreadable and unwritable by default. At this time, the secondary file system cannot be mounted.
  • The ports for the replication link between storage devices cannot be the same as those for the connection between hosts and storage devices or be used as binding ports.
  • In terms of creating a remote replication, the link bandwidth must meet the following requirement: Link bandwidth > Peak service bandwidth/Bandwidth utilization rate (recommended: > 10 Mbit/s).
NOTE:

Remote replication can replicate Homedir information to secondary file systems. After creating user information same as that in the primary storage system and enabling Homedir sharing in the secondary storage system, you can view Homedir information from the secondary storage system.

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Updated: 2019-01-02

Document ID: EDOC1000069276

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