If you wish to create raid 5 (3+1) device then give data_member_count=3 and 7 if you are creating raid 5 (7+1).  regards, Saurabh
Hello,  I am preety new to VMAX environment. I am trying to do some device allocation/creation in VMAX with the help of an AIX host in a LAB environment.  I have already created a thin pool and when I try to create a data devices to add to the pool, i get a 'no disk group present' message:  symconfigure -sid 26 -cmd "create dev count=2 , size=10000 CYL,emulation=FBA, in pool lpar1 member_state=enable config=RAID-5, data_member_count=2, attribute=datadev;" commit  Execute a symconfigure operation for symmetrix '000192604026' (y/ ) ? y    A Configuration Change operation is in progress. Please wait...       Establishing a configuration change session...............Established.       Error occurred while Defining change number 1:        Disk group is required for this operation       Terminating the configuration change session..............Done.   The configuration change session has failed.    Can anyone please help out on how to create the disk group for the above VMAX array ? Also, please share a step by step info on the device allocation for the AIX host. from the below output, can i confirm that my AIX HBA WWN is logging into the symmtrix arraay sid 26 :  ibm-520-4-lpar1# symmask list hba   Identifier        Type   Adapter           Physical Device Path      Dir:P ----------------  -----  ----------------  ------------------------  ----- c05076004ec00000  Fibre  15-T1             /dev/rhdisk40             07G:0 c05076004ec00002  Fibre  17-T1             /dev/rhdisk111            07G:0  ibm-520-4-lpar1# symmask -sid 26 list logins|grep -i C05076004EC00000 c05076004ec00000 Fibre NULL             NULL             073b0a Yes    Yes c05076004ec00000 Fibre NULL             NULL             073b0a Yes    Yes  ibm-520-4-lpar1#  symmask -sid 26 list logins|grep -i C05076004EC00002 c05076004ec00002 Fibre NULL             NULL             073909 Yes    Yes c05076004ec00002 Fibre NULL             NULL             073909 Yes    Yes  please suggest ?
Disk group in VMAX