Administrator Guide

Table Of Contents
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在迁移期间会创建一个临时镜像用于将数据从迁移源移到目标。只有在虚拟卷上将 thin-capable thin-enabled
属性都设置为 true Metro Node 才会处理 UNMAP 命令。
如果迁移的目标是容量比源设备大且支持精简功能的设备则在迁移完成后Metro Node 虚拟卷会继续支持精简功能并会
保留之前经过资源调配的 thin-enabled 属性。要利用未使用的容量请使用 virtual-volume expand 命令。
当从启用精简功能的设备迁移到非精简设备如密集设备卷的 thin-enabled 属性将保持 enabled 状态但在迁移期间将
拒绝 UNMAP。迁移成功完成后thin-enabled 属性将变为 unavailable因为目标设备是密集设备。此行为是有意设计的
因为迁移中止或失败时卷将恢复为精简卷。
在运行一次性迁移时请考虑以下事项
在精简到密集扩展区迁移或设备迁移中具有受支持的虚拟卷),如果源支持精简功能而目标不支持精简功能则在迁移后
受支持的虚拟卷不会启用精简功能或不支持精简功能。
VPlexcli:/clusters/cluster-1/devices> dm migration start --paused --name my_migration --
from thin_source
--to device_thick_1
The source 'thin_source' is thin-capable but the target 'device_thick_1' is not thin-
capable. The
virtual-volume 'thin_source_vol' will not be thin-enabled or thin-capable after migration.
Do you wish to proceed? (Yes/No) no
dm migration start: Evaluation of <<dm migration start --paused --name my_migration --
from thin_source/
--to device_thick_1_c1/>> failed.
cause: Failed to create a new data-migration.
cause: Operation was halted by the user
VPlexcli:/clusters/cluster-1/devices>
VPlexcli:/clusters/cluster-1/storage-elements/extents> dm migration start --paused --name
my_migration
--from thin_extent_1 --to thick_extent_1
The source 'thin_extent_1' is thin-capable but the target 'thick_extent_1' is not thin-
capable.
The virtual-volume 'thin_source_vol' will not be thin-enabled or thin-capable after
migration.
Do you wish to proceed? (Yes/No) no
dm migration start: Evaluation of <<dm migration start --paused --name my_migration --
from extent_20
--to extent_31>> failed.
cause: Failed to create a new data-migration.
cause: Operation was halted by the user
VPlexcli:/clusters/cluster-1/storage-elements/extents>
在精简到密集扩展区迁移中没有受支持的虚拟卷),如果源支持精简功能而目标不支持精简功能则在迁移后源将失去其
精简功能。
VPlexcli:/clusters/cluster-1/storage-elements/extents> dm migration start --paused --name
my_migration
--from thin_extent_2 --to thick_extent_1
The source 'thin_extent_2' is thin-capable but the target 'thick_extent_1' is not thin-
capable.
Thin-capability will be lost after migration. Do you wish to proceed? (Yes/No) no
dm migration start: Evaluation of <<dm migration start --paused --name my_migration --
from extent_21
--to extent_31>> failed.
cause: Failed to create a new data-migration.
cause: Operation was halted by the user
VPlexcli:/clusters/cluster-1/storage-elements/extents>
提交一次性迁移时请考虑以下事项
在精简到密集设备迁移中Metro Node CLI 会显示一条消息指出虚拟卷的精简属性已禁用。
VPlexcli:/data-migrations/extent-migrations> dm migration commit my_migration --force
The virtual-volume 'my_vol' is no longer thin-capable and will not be thin-enabled after
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数据迁移