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  • 1.  Volume Offline

    Posted Mon September 02, 2024 04:06 PM
    Edited by Wilfrido Gonzalez Mon September 02, 2024 04:51 PM
    I have this situation on FS5200(8.6.3.0), when I create a new volume it automatically goes offline, I check background tasks and I don't find anything with an error, I look in the notification panel and I don't find anything related to the creation of the new volume, but when I run the lsvdiskprogress command I see that the new volume is 0% formatted.
     
    The average IOPS is 9,000 to 15,000, connected to 4 hosts with vmware esxi connected via SAN SWITCH.
    Disk pool has a lot of free space.
    Any suggestions for this problem?



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    Wilfrido Gonzalez
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  • 2.  RE: Volume Offline

    Posted Tue September 03, 2024 02:40 AM

    Even if you create the volume with -fmtdisk parameter , this is not normal behaviour. are you sure you have enough capacity on your pool? check with the lsmdiskgrp command. 



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    Nezih Boyacioglu
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    Original Message


  • 3.  RE: Volume Offline

    Posted Fri September 06, 2024 09:56 AM
      |   view attached

    These days I tried to reduce the IOPs and try to create new volumes, the result is the same.
    I attach the result of lsmdiskgrp, if anyone can see any values ​​outside the ranges.
    Thanks.



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    Wilfrido Gonzalez
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    Attachment(s)

    txt
    fs5200_failed_to_create_volume.txt   2 KB 1 version
    Original Message


  • 4.  RE: Volume Offline

    Posted Mon September 09, 2024 05:46 AM
    Edited by Virgile VATIN Mon September 09, 2024 06:23 AM

    Hi, 

    Do you use thin-provisionned volumes ? On doc  IBM FlashSystem Best Practices and Performance Guidelines.  : Chapter 5 (p. 193)

    Thin-provisioned volumes are available in two operating modes: autoexpand and 
    noautoexpand. You can switch the mode at any time. If you select the autoexpand feature, 
    IBM FlashSystem automatically adds a fixed amount of extra real capacity to the thin volume 
    as required. Therefore, the autoexpand feature attempts to maintain a fixed amount of unused 
    real capacity for the volume. We recommend using autoexpand, by default, to avoid 
    volume-offline issues

    Regards

    Edit :  on your first pool treshold is 80 % and you are a little over this treshold (84%) may is your volumes go offline do to that.

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    Virgile VATIN
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    Original Message


  • 5.  RE: Volume Offline

    Posted Fri September 06, 2024 07:41 AM

    Feels like a bug? I probably open a case with IBM support.
    Also, creating a volume using mkvdisk is more comfortable for me ..than GUI.



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    naveen sriram
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    Original Message


  • 6.  RE: Volume Offline

    Posted Mon September 16, 2024 08:37 AM

    I doubt this is a bug, I think this is a complexity caused by using mkvdisk on the CLI with incorrect parameters.  I recommend creating volumes using the GUI or using mkvolume and validating the vdisk is online.  Then look at the parameters used by the GUI compared with the CLI information.

    I suspect you are creating thin volumes without autoexpand, which is part of the reason we are moving folks to mkvolume, there are fewer parameters to trip over given the long history of mkvdisk and the desire to simplify the product/make it harder to set up a volume incorrectly.



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