Primary Storage

 View Only

  • 1.  not compatible with the existing storage in the pool

    Posted Tue August 31, 2021 01:34 PM

    Hi,

    following issue:

    I have a V7000 Gen1 with pool1 (one mdisk RAID6 and 12 NL disks)

    and pool0 (also one mdisk RAID6 with 16 SAS disks).

    After buying 7 additional SAS disks, same model with the old ones,

    I tried to create another mdisk and add it to pool0

    but it is grayed out when I try to add it to pool0 (not compatible with the existing storage in the pool) while it let's me add it to pool1!

    Any idea what is wrong?

    Thanks in advance for any suggestion

    ag



    #Storwize
    #Support
    #SupportMigration


  • 2.  RE: not compatible with the existing storage in the pool

    Posted Thu July 28, 2022 08:26 AM

    HI,

    I have a similar case on FS9150 2way cluster which require to add another mdisk with 9x FCMs with the same type to existing pool.

    But the same message occurred when creating it on GUI.

    Could i ask you how to solve it at that time ?



    #Storwize
    #Support
    #SupportMigration


  • 3.  RE: not compatible with the existing storage in the pool

    Posted Wed March 29, 2023 11:23 AM

    Hi, long time later...
    It worked via CLI



    ------------------------------
    Apostolos Gkavanozis
    ------------------------------

    Original Message


  • 4.  RE: not compatible with the existing storage in the pool

    Posted Thu March 30, 2023 04:29 AM

    Hi Apostolos,

    going the CLI way in fact is the only way to go.

    This is due to the RAID config presets in the GUI, which prevents a user from creating configurations, which the architects considered sub-optimal.



    ------------------------------
    Christian Schroeder
    IBM SpecV Storage Support with Passion
    ------------------------------

    Original Message


  • 5.  RE: not compatible with the existing storage in the pool

    Posted Wed July 31, 2024 02:56 PM

    Hi Apostolos,

    Another long time later, ;-)

    Could you share the CLI command to add the mdisk to existing pool?

    Thanks,

    Ramon Medina



    ------------------------------
    Ramon Medina
    ------------------------------

    Original Message


  • 6.  RE: not compatible with the existing storage in the pool

    User Group Leader
    Posted Thu August 01, 2024 04:54 AM
    Edited by Evelyn Perez Thu August 01, 2024 04:58 AM

    I recommend you check out the IBM Documentation which has an extensive CLI guide: https://www.ibm.com/docs/en/flashsystem-7x00/8.7.x?topic=reference-managed-disk-commands


    HOWEVER!  I caution you about going straight to the CLI.  This isn't a thing "Architects considered suboptimal", We are trying to prevent you from creating configurations that can lead to performance or balancing issues.

    Modern builds you should be using DRAID and expanding it, not adding mdisks.    Moreover, in some cases (such as with multiple compressing arrays using FCMs) you can cause conditions that drive the capacity out of space which is why this is prevented.

    There are best practices and then there are bad ideas.  When it comes to the RAID config we remove things that are a bad idea, while still letting you do some things that might be against best practices.  So buyer beware - if you go do this and you suffer a performance issue or have a problem on rebuild its because you weren't following the built in system guidance on how to configure the RAID arrays.


    ------------------------------
    Evelyn Perez
    IBM Senior Technical Staff Member
    IBM Storage Virtualize Software Architect for SVC and FlashSystem
    ------------------------------

    Original Message


  • 7.  RE: not compatible with the existing storage in the pool

    Posted Mon August 05, 2024 02:45 PM

    Thanks for your response Evelyn, I understand and agree.

    One question, I have a Pool with a mdisk0 (12x 2.18TB hdd draid 6) and a mdisk1 (4x 400GB ssd draid5), I want to add 4x 2.18TB hdd to the mdisk0 for a total of 16 hhd. It is possible to make that configuration. When I try to add the disks Im getting the same error "Not Compatible with the existing storage in the Pool".

    Thanks,

    Ramon Medina



    ------------------------------
    Ramon Medina
    ------------------------------

    Original Message


  • 8.  RE: not compatible with the existing storage in the pool

    User Group Leader
    Posted Tue August 06, 2024 04:58 AM

    Hi , 

    If you already have a pool with mdisk 0 and mdisk 1, my recommendation is to expand the Distributed array mdisk0 with the new capacity rather than attempting to create a new tiny array.  

    https://www.ibm.com/docs/en/flashsystem-7x00/8.7.x?topic=commands-expandarray

    You may not be able to do this if you are an ancient hardware (I believe we added it in 8.3ish).

    you don't want to have a 4 drive array though.  How you move forward depends on if you have swing space, a newer/in support set of hardware and how important your existing data is to you.

    Best practices would be to have a single 16 drive mdisk0 array as well as you SSD array in that pool.



    ------------------------------
    Evelyn Perez
    IBM Senior Technical Staff Member
    IBM Storage Virtualize Software Architect for SVC and FlashSystem
    ------------------------------

    Original Message