I've got a CentOS 5 server that I want to migrate over into a
virtualized instance.
The problem is I need to minimize downtime so was trying to figure out
a way to "live" clone the original.
Initially, I thought I could do this via exporting an iSCSI target
from the virtual host, create a MD raid 1 array on the C5 server, wait
for it to sync, then shutdown the physical server and switch to the
virtual one.
But after getting iSCSI working... I realize I could not create a md
device on a mounted disk. Unfortunately this old C5 wasn't setup with
md raid 1 originally so I can't just add a the iSCSI target as an
additional member for a triplicate.
So I remembered DRBD was supposed to be used for replication.
But after getting things set up, running the drbd-admin create-md
command gave me this scary warning it will destroy data on the disk.
Apparently because drbd writes meta data to the drive. So that appears
to be a no go too.
Am I missing something glaringly obvious here, or is the only way I'm
going be able to migrate is to shutdown the C5 server for a few hours
while duping the old drives? Would greatly appreciate any pointers how
best to do this.
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