Experiences with online storage migration of huge volumes?

[udo]

Hi all,
I want to migrate some big VM-Volumes from an internal raid to an FC-Raid (LVM) online.
And big mean realy big - up to 10TB.
The destination raid should be much faster than the source-storage. Especially for the biggest volume, which are on an slow iscsi-raid (LVM) now.

Has anybody experiences with such big storage migrations?
Is there any pitfall?

Udo

 

[Alwin]

>= 10 GbE link? Enough resources for the IO load?

As long as less data changes on the source the move disk should be no problem.

 

[udo]

Hi Alwin,
unfortunality due the bad iscsi-raid the iowait are so high, that from other vms the drbd-sync (inside the vms) failed.
Due that all VMs are using drbd inside to sync the data I recreate the big disks on the fibrechannel-raid and let DRBD resync the data again.

Udo