Help Center/ Server Migration Service/ Service Overview/ Notes and Constraints
Updated on 2025-04-17 GMT+08:00
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Notes and Constraints

This section describes the constraints and limitations on using SMS.

Server Requirements

Item

Description

Server specifications
  • Windows: Source and target servers must have more than 1 CPU and 1 GB of memory each.
  • Linux: Source and target servers must have at least 1 CPU and 1 GB of memory each.

OSs

Available disk space
  • Windows
    • At least 320 MB available space on a partition not smaller than 600 MB
    • At least 40 MB available space on a partition smaller than 600 MB
  • Linux

    At least 200 MB of available space on the root partition

File systems
  • Windows: Only NTFS file systems are supported.
  • Linux: Only Ext2, Ext3, Ext4, VFAT, XFS, and Btrfs file systems are supported.

Shared file systems

SMS cannot migrate data from shared file systems such as NFS or CIFS, or from NAS devices.

Migration Constraints

Item

Description

Source server quantity

A maximum of 1,000 source servers are allowed per account. Delete the records of migrated servers in a timely manner so that other servers can continue to be migrated.

External storage of servers

SMS cannot migrate data from the external storage attached to a source server.

Encrypted files

SMS cannot migrate OSs that contain protected folders or encrypted volumes.

Servers that run multi-node databases and Active Directory Domain Services (AD DS)

SMS cannot migrate servers that host active directories or multi-node databases.

Data of database applications and domain controller applications

SMS cannot migrate data of database applications and domain controller applications.

Applications bound to hardware

SMS cannot migrate OSs that contain applications bound to hardware.

Dynamic disks

Dynamic disks in Windows systems are migrated as basic disks. After the migration is complete, the target server will not have dynamic disks.

Unused or empty disks

SMS only migrates disks that are attached and used on a source server. Unused disks will not be migrated.

Servers with system volumes located on disks other than the first disk

SMS cannot migrate servers whose system volumes are not on the first disk.

Thinly-provisioned logical volumes

SMS cannot migrate thinly-provisioned volumes.

Servers with RAID arrays

SMS cannot migrate servers with RAID arrays.

Big data clusters and container clusters

SMS cannot migrate clusters including but not limited to container clusters and big data clusters.