Re: [Xen-API] Configuration needed to share a VDI

[Carlos Eduardo Tavares Terra <eduardo.terra@xxxxxxxxx>]

Mike,

I have tried to do what you said, but I have got an error.

My steps:

[root@vmserver05 ~]# xe sr-param-list uuid=81a9d5c1-f0a8-ecfb-28b0-59154f2b70df

uuid ( RO)                    : 81a9d5c1-f0a8-ecfb-28b0-59154f2b70df

              name-label ( RW): VMDATA02_RAID10

        name-description ( RW): iSCSI SR [172.30.1.101 (iqn.1984-05.com.dell:powervault.md3200i.6782bcb00006b020000000004d41e117)]

                    host ( RO): <shared>

      allowed-operations (SRO): forget; VDI.create; VDI.snapshot; plug; update; destroy; VDI.destroy; scan; VDI.clone; VDI.resize; unplug

      current-operations (SRO):

                    VDIs (SRO): 6fc452d3-7381-4416-a2c9-71e526261c40

                    PBDs (SRO): 0aee7f9b-3171-f2cf-c3a4-929bb538b247; d3d748b6-574b-598e-5c43-3e4e79c73515; 04e035ba-781c-7c6d-c54b-97b589bc985b; cfbe9adc-e233-5f2d-d798-058815a247d0; 5badfa05-dd7c-3b90-7fde-01c2ea7483e9

      virtual-allocation ( RO): 1073741824

    physical-utilisation ( RO): 1077936128

           physical-size ( RO): 600016158720

                    type ( RO): lvmoiscsi

            content-type ( RO):

                  shared ( RW): true

            other-config (MRW):

               sm-config (MRO): allocation: thick; use_vhd: true; multipathable: true; devserial: scsi-36782bcb000069cb1000003724df80c1e

                   blobs ( RO):

     local-cache-enabled ( RO): false

                    tags (SRW):

[root@vmserver05 ~]# xe vdi-create sr-uuid=81a9d5c1-f0a8-ecfb-28b0-59154f2b70df name-label=teste virtual-size=1GiB type=user sm-config:type=raw sharable=true

782f2e7b-77d4-4590-b5c4-d2d473c6b63f

Then I have attached this disk in 2 VMs using XenCenter. The VBDs were created, as display here:

[root@vmserver05 ~]# xe vdi-param-list uuid=782f2e7b-77d4-4590-b5c4-d2d473c6b63f

uuid ( RO)                    : 782f2e7b-77d4-4590-b5c4-d2d473c6b63f

              name-label ( RW): teste

        name-description ( RW):

           is-a-snapshot ( RO): false

             snapshot-of ( RO): <not in database>

               snapshots ( RO):

           snapshot-time ( RO): 19700101T00:00:00Z

      allowed-operations (SRO): resize_online; clone

      current-operations (SRO):

                 sr-uuid ( RO): 81a9d5c1-f0a8-ecfb-28b0-59154f2b70df

           sr-name-label ( RO): VMDATA02_RAID10

               vbd-uuids (SRO): c56c23da-85eb-5ae8-a413-18da3d8870b3; 5ca07308-d296-37d9-a715-475453126949

         crashdump-uuids (SRO):

            virtual-size ( RO): 1073741824

    physical-utilisation ( RO): 1073741824

                location ( RO): 782f2e7b-77d4-4590-b5c4-d2d473c6b63f

                    type ( RO): User

                sharable ( RO): true

               read-only ( RO): false

            storage-lock ( RO): false

                 managed ( RO): true

                  parent ( RO): <not in database>

                 missing ( RO): false

            other-config (MRW):

           xenstore-data (MRO): vdi-type: aio; storage-type: lvm; scsi/0x12/0x83: AIMAMQIBAC1YRU5TUkMgIDc4MmYyZTdiLTc3ZDQtNDU5MC1iNWM0LWQyZDQ3M2M2YjYzZiA=; scsi/0x12/0x80: AIAAEjc4MmYyZTdiLTc3ZDQtNDUgIA==; vdi-uuid: 782f2e7b-77d4-4590-b5c4-d2d473c6b63f

               sm-config (MRO): host_OpaqueRef:52a45c20-d88f-5869-7f7b-318b17833721: RW; type: raw; vdi_type: aio

                 on-boot ( RW): persist

           allow-caching ( RW): false

                    tags (SRW):

But I could activate (plug) only one of them. When I try to plug on both of them I get this error:

[root@vmserver05 ~]# xe vbd-plug uuid=c56c23da-85eb-5ae8-a413-18da3d8870b3

Error code: SR_BACKEND_FAILURE_46

Error parameters: , The VDI is not available [opterr=VDI 782f2e7b-77d4-4590-b5c4-d2d473c6b63f already attached RW],

Is there any parameter am I missing?

On Fri, May 18, 2012 at 10:58 AM, Mike McClurg <mike.mcclurg@xxxxxxxxxx> wrote:

On 18/05/12 11:49, Carlos Eduardo Tavares Terra wrote:

Do I need to do any special configuration in XCP 1.1 or in the SRs to be
capable of sharing a VDI between two virtual machines?
Is it possible to do in XCP?

You could possibly do this if only one VM attaches the disk RW, but you should definitely not do this if you want more than one of the VMs to attach the disk RW. For that, you should use something like NFS instead.

To share a VDI, create a new vbd to connect the second VM to the VDI. Do 'xe help vbd-create' for docs.

Mike

--
Carlos Eduardo Tavares Terra
Red Hat Certified Engineer
Consultor em Infraestrutura de TI
GNU/Linux #413291 [http://counter.li.org]

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