Re: [ovirt-users] Behaviour when attaching shared iSCSI storage with existing data
On Thu, Jan 4, 2018 at 4:03 AM, Sam McLeod <mailinglists(a)smcleod.net> wrote:
If one was to attach a shared iSCSI LUN as 'storage' to an
oVirt data
centre that contains existing data - how does oVirt behave?
For example the LUN might be partitioned as LVM, then contain existing
filesystems etc...
- Would oVirt see that there is existing data on the LUN and simply attach
it as any other linux initiator (client) world, or would it try to wipe the
LUN clean and reinitialise it?
Neither - we will not be importing these as existing data domains, nor wipe
them, as they have contents.
Context: Investigating migration from XenServer to oVirt (4.2.0)
A very interesting subject - would love to see the outcome!
All our iSCSI storage is currently attached to XenServer hosts, XenServer
formats those raw LUNs with LVM and VMs are stored within them.
I suspect we need to copy the data. We might be able to do some tricks, but
at the end of the day I think copying the data, LV to LV, makes the most
sense.
However, I wonder what else is needed - do we need a conversion of the
drivers, different kernel, etc.?
What are the export options Xen provides? Perhaps OVF?
Is there an API to stream the disks from Xen?
Y.
*If the answer to this is already out there and I should have found it by
searching, I apologise, please point me to the link and I'll RTFM.*
--
Sam McLeod
https://smcleod.net
https://twitter.com/s_mcleod
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