sumit_ghosh
2 Bronze

Disk group in VMAX

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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 ?

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1 Solution

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sauravrohilla
4 Tellurium

Re: Disk group in VMAX

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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

View solution in original post

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11 Replies
Jill_M
3 Argentum

Re: Disk group in VMAX

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Hello,

The team is going to move this thread to the Support Forums Community where your question can be addressed.

Kind regards,

Jill

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RFritz11
3 Zinc

Re: Disk group in VMAX

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Hello,

We've moved your question to the Symmetrix Support Forums Community where your question should be addressed promptly. Kind regards.

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SKT2
4 Beryllium

Re: Disk group in VMAX

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can u post `symdisk list -dskgrp_summary`

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SKT2
4 Beryllium

Re: Disk group in VMAX

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you r probaly  missing the `disk_group=x ` argument

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sumit_ghosh
2 Bronze

Re: Disk group in VMAX

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ibm-520-4-lpar1# symdisk list -dskgrp_summary

Symmetrix ID: 000192604026

      Disk Group                Disk                       Capacity
---------------------- ----------------------- --------------------------------
                                 Speed  Size      Total      Free      Actual
Num Name                Cnt Tech (RPM)  (MB)      (MB)       (MB)       (MB)
---------------------- ----------------------- --------------------------------

  1 DISK_GROUP_001      120 FC   15000  418710   50245254   39847781   50245254
                                               ---------- ---------- ----------
Total                                            50245254   39847781   50245254

when i give the disk group as 1 and try to commit, it gives the below error :

ibm-520-4-lpar1#  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 disk_group=1;" 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:
    Invalid data member count supplied in create dev request see SYMAPI log file for more details
    Terminating the configuration change session..............Done.

The configuration change session has failed.

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SKT2
4 Beryllium

Re: Disk group in VMAX

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try data_member_count=3 ( 3 devices for minimum for raid 5)

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sauravrohilla
4 Tellurium

Re: Disk group in VMAX

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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

View solution in original post

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Quincy561
4 Beryllium

Re: Disk group in VMAX

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Since there seems to be only one disk group in the Symmetrix, do you have to specify that in the command line?

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SKT2
4 Beryllium

Re: Disk group in VMAX

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first message said " disk group number" required; second one said invalid data_member_count;  I am thinking this particula code level may be only suporting a specific geomery like 3+1 or 7+1; so if that is true then 2+1 will not work

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