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4774
Vmotion with RAW Devices ( GK ) , is that Possible or not ?
Dears
Vmotion with RAW Devices ( GK ) , is that Possible or not ?
I tried to share gatekeepers and tested Server with SMC but didnt do the vmotion
shall I change configuration of GKs on vmware or what ?
SamiEMC
72 Posts
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November 16th, 2012 10:00
Hello Hemachandra
I removed the RDMs from the Storage group and added new ones
the issue was resolved after and the vms with the GKs and the SMC were able to validate on all ESXi's on Cluster
I dont know why VML identifer was not the same for the GKs on all the ESXi Hosts
now all are ok
thanks all
hemachandra_s
28 Posts
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November 7th, 2012 02:00
It is possible to vMotion with Physical RDM device.
If a virtual machine uses an RDM, the RDM must be accessible by the destination host.
If you are provisioning it to SE/SMC as a GK, that is the requirement. Please refer Primus emc248427 which talks on the same.
SamiEMC
72 Posts
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November 7th, 2012 03:00
I will check that options when adding Gatekeepers and update you
they are shared across esxi's but didnt work for vmotion
sauravrohilla
859 Posts
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November 7th, 2012 17:00
Or you are saying that you shutdown the VM then do a migrate to another node and then power it on? Or its a live migration?
sauravrohilla
859 Posts
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November 7th, 2012 17:00
Hi Hema,
Thats interesting. I believe RDMs as Physical do not allow vMotion. Thats what we have in our environment and it does not do vMotion. But if you are saying its possible then we need to discuss it. I will contact you offline
regards,
Saurabh
SamiEMC
72 Posts
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November 7th, 2012 18:00
when i tested , live and after shutdown
and both failed
sauravrohilla
859 Posts
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November 7th, 2012 22:00
I append my statement, EMC do not support GK as virtual RDMs.
regards,
Saurabh
Archuperi721
110 Posts
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November 7th, 2012 22:00
Yes, it is possible 100% when the virtual RDM mode is used.
sauravrohilla
859 Posts
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November 7th, 2012 22:00
EMC do not support virtual RDMs.
hemachandra_s
28 Posts
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November 8th, 2012 02:00
As per
http://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc%2FGUID-8AE88758-20C1-4873-99C7-181EF9ACFA70.html
If you use vMotion to migrate virtual machines with raw device mapping (RDM) files, make sure to maintain consistent LUN IDs for RDMs across all participating hosts.
http://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc%2FGUID-8AE88758-20C1-4873-99C7-181EF9ACFA70.html
If you use vMotion to migrate virtual machines with RDMs, make sure to maintain consistent LUN IDs for RDMs across all participating ESXi hosts.
As per http://kb.vmware.com/kb/1005241
Any RDMs remain as RDMs when the virtual machine is registered to another host. That is, no changes to the virtual machine itself are made
SamiEMC
72 Posts
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November 8th, 2012 07:00
could you explain more ?
how to maintain consistent LUN IDs for RDMs across all participating ESXi hosts ?
Archuperi721
110 Posts
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November 8th, 2012 10:00
Its done at the storage level. If the SCSI ID / Host LUN ID (HLU) is maintained across all the array front end adaptors (ports used for host connection) you might get the consistent LUN ID. And some work around on the host according to the OS.
sauravrohilla
859 Posts
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November 8th, 2012 23:00
Hema,
I believe that vmware KB is only for virtual RDMs not for physical RDM. COuld you please confirm?
regards,
Saurabh
SamiEMC
72 Posts
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November 9th, 2012 05:00
so , do i need to convert to vRDMS and check
what about Lun Numbers ? what should be done for them to have successfull vmotion ?
hemachandra_s
28 Posts
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November 9th, 2012 05:00
Saurabh
That applies to both pRDM and vRDM.
Even the other article talks the same.
http://pubs.vmware.com/vsphere-4-esxi-installable-vcenter/index.jsp?topic=/com.vmware.vsphere.esxi_server_config.doc_41/esx_server_config/raw_device_mapping/c_benefits_of_raw_device_mapping.html
Similar discussion is in VMware communities website
"VMotion VM with RDM Physical"
http://communities.vmware.com/thread/191518