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January 30th, 2018 02:00

RDF Create with file shows wrong order of Luns in rdf query command

When issuing a "RDF create -g xxx -f filename...." it starts the rdf relationshop.  Doing a "RDF query" - Command afterwards the order of LUNs doesn' fit to the contents of that file.

Deleting the RDF connection and a "RDF query" the order is correct:

File order:

DEV001   00A23 001F6

DEV002   00A24 001F7

DEV003   00A25 001F8

DEV004   00A26 001F9

DEV005   00986 0062F

DEV006   0098A 00633

DEV007   00B1A 00637

DEV008   00B1E 0063B

DEV009   00B23 0063F

DEV010   00B27 00643

Order after a "RDF create...":

"symrdf -g CIN query"

Device Group (DG) Name       : CIN

DG's Type : RDF1

DG's Symmetrix ID            : 000292604887    (Microcode Version: 5876)

Remote Symmetrix ID          : 000292604888    (Microcode Version: 5876)

RDF (RA) Group Number        :   1 (00)

        Source (R1) View Target (R2) View     MODE

--------------------------------- ------------------------ ---- ------------

ST LI       ST

Standard A N        A

Logical  Sym    T R1 Inv  R2 Inv   K Sym    T R1 Inv  R2 Inv       RDF Pair

Device   Dev    E Tracks Tracks   S Dev    E Tracks  Tracks  MACE STATE

--------------------------------- -- ------------------------ ---- ------------

DEV001   00986 RW 0  350374 RW 0062F WD 0       0 S... SyncInProg

DEV002   0098A RW       0  341484 RW 00633 WD 0       0 S... SyncInProg

DEV003   00A23 RW 0    6622 RW 001F6 WD 0       0 S... SyncInProg

DEV004   00A24 RW       0 32615 RW 001F7 WD 0       0 S... SyncInProg

DEV005   00A25 RW       0 17739 RW 001F8 WD 0       0 S... SyncInProg

DEV006   00A26 RW       0 34311 RW 001F9 WD 0       0 S... SyncInProg

DEV007   00B1A RW       0  333022 RW 00637 WD       0       0 S... SyncInProg

DEV008   00B1E RW 0  296063 RW 0063B WD 0       0 S... SyncInProg

DEV009   00B23 RW 0  366975 RW 0063F WD 0       0 S... SyncInProg

DEV010   00B27 RW       0  337492 RW 00643 WD       0       0 S... SyncInProg


Forcing the RDF connection and again RDF query  :

"symdg delete CIN -force"

"symrdf -g CIN query"

Device Group (DG) Name       : CIN

DG's Type : RDF1

DG's Symmetrix ID            : 000292604887    (Microcode Version: 5876)

Remote Symmetrix ID          : 000292604888    (Microcode Version: 5876)

RDF (RA) Group Number        :   1 (00)

        Source (R1) View Target (R2) View     MODE

--------------------------------- ------------------------ ---- ------------

ST LI       ST

Standard A N        A

Logical  Sym    T R1 Inv  R2 Inv   K Sym    T R1 Inv  R2 Inv       RDF Pair

Device   Dev    E Tracks Tracks   S Dev    E Tracks  Tracks  MACE STATE

--------------------------------- -- ------------------------ ---- ------------

DEV001   00A23 RW       0       0 RW 001F6 WD 0       0 S... Synchronized

DEV002   00A24 RW       0       0 RW 001F7 WD 0       0 S... Synchronized

DEV003   00A25 RW       0       0 RW 001F8 WD 0       0 S... Synchronized

DEV004   00A26 RW       0       0 RW 001F9 WD 0       0 S... Synchronized

DEV005   00986 RW 0       0 RW 0062F WD       0 0 S... Synchronized

DEV006   0098A RW       0       0 RW 00633 WD 0       0 S... Synchronized

DEV007   00B1A RW       0       0 RW 00637 WD 0       0 S... Synchronized

DEV008   00B1E RW       0       0 RW 0063B WD 0       0 S... Synchronized

DEV009   00B23 RW       0       0 RW 0063F WD 0       0 S... Synchronized

DEV010   00B27 RW       0       0 RW 00643 WD 0       0 S... Synchronized

Is there something wrong in our configuration ?

Because 4 different HP-UX will use these LUNs a different order of the LUN adresses will cause a mixture on the Conti Cluster, i.e:

Server 1 DEV001 shows adress 00986 / Server 2 DEV001 is 00A23 but these two server are part of a cluster.

Alfons

3 Posts

January 30th, 2018 07:00

We did a test on a test - system and found the solution for this request:


To define the SRDF relationship we issued a "symrdf createpair - f without the "-g" for group.


This will create the RDF definition based on the file content without assigning it to a group


Afterwards we must create a group for the devices using "symdg create ..." and add the devices with "symdg add devices ....


This will start the RDF connection with the devices in the order listed in the file used for creating the group

3 Apprentice

 • 

465 Posts

January 30th, 2018 16:00

The logical device name in the device group "DEVxxx" is not the LUN number that is presented to the host. It is just a label assigned to the device in the DG. In other words the scope of the logical device name is limited to Device group operations.

If your clusters are doing device group operations, you can consider using GNS device groups. With a GNS device group the DG instance lives on the array and all of the cluster nodes will see the same DG and therefore the Device logical name to Symmetrix device relationship will be the same.

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