Migrating FC or iSCSI Data to the Storage System
FC or iSCSI data migration environment and limitations
The following table outlines the environment for a manual copy migration and an application tool migration of FC or iSCSI data.
Component
|
Requirement
|
---|---|
Unity storage
|
LUN sized to accommodate the data in the LUN that you want to migrate and to allow for data growth
|
Host
|
Single host with access to the LUN with data to be migrated and also to the LUN for the migrated data
|
LUN
|
Single LUN on either a local or attached FC or iSCSI storage device that you migrate in its entirety to the storage system share
|
The downtime for a manual copy migration is relative to the time required for copying the data from the LUN to the storage system LUN. The downtime for an application-specific tool migration should be less than the downtime for a manual copy.
Migrating iSCSI disk data
To migrate iSCSI data to a storage system LUN, perform these tasks:
Attach the host or virtual machine to the new storage system LUN
Procedure
- Configure each host or virtual machine initiator that needs access to the LUN to connect to the iSCSI interface (target) with the new LUN, as described in Windows host — Configuring to connect to an iSCSI interface for a Windows host or virtual machine or Linux host — Setting up for iSCSI storage for a Linux host.
- Prepare the new LUN to receive data, as described in Windows host — Setting up to use iSCSI LUNs for a Windows host or Linux host — Setting up for iSCSI storage for a Linux host.
Migrate the data
Procedure
- If any host or virtual machine applications are actively using the device (LUN) with the data being migrated, stop the applications gracefully.
- Migrate the data with the method best suited for copying data from the device to the new storage system LUN.
On a Windows host, this method can be a simple cut and paste or drag and drop operation.
- When the copy operation is complete:
On a Windows host:
- Assign a temporary drive letter to the LUN.
- Assign the old drive letter to the LUN to which you copied the data.
On a Linux host:
- Unmount the original file system on the device.
- Adjust the host’s mount tables, which are typically in /etc/fstab, to reflect the new location of the data.
- Mount the new LUN using the mount -a or a similar command.
- Restart the applications on the host.