You cannot use the SAN Volume Controller data
migration function to move a virtual disk (VDisk)
between managed disk (MDisk) groups that have different extent sizes.
However,
you can use Copy Services to move the data by copying a VDisk between
MDisk
groups that have different extent sizes.
To
copy a VDisk between MDisk groups that have different extent
sizes, you have the following options:
- Use FlashCopy® to
copy a VDisk between a source and a destination MDisk group.
- Use
intracluster Metro Mirror to copy a VDisk between a source and a destination
MDisk group.
Using FlashCopy
This option is available
if
you have licensed the FlashCopy feature.
Use
the following guidelines
for using FlashCopy to
copy a VDisk between a source and a destination MDisk group that have
different
extent sizes:
- The VDisk must not be in another FlashCopy or
Metro Mirror relationship.
- Stop all I/O operations from the
hosts while the VDisk is being copied.
- Once the copy is complete,
configure host mappings for the new VDisk and
configure the hosts to access the destination VDisk rather than the
source
VDisk.
Using Metro Mirror
This
option is available if you
have licensed the Metro Mirror feature.
Use the following guidelines
for using Metro Mirror to copy a VDisk between a source and a destination
MDisk group that have different extent sizes:
- The VDisk must
not be in another FlashCopy or Metro Mirror
relationship.
- Create an intracluster Metro Mirror relationship
for the VDisks.
- I/O operations from the host can continue
while the copy is being performed,
however there will be some performance degradation while write I/O
operations
are mirrored.
- Once the copy is complete, stop all I/O operations
from the hosts. Configure
host mappings for the new VDisk and configure the hosts to access
the destination
VDisk rather than the source VDisk.