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  • 1.  ESXi 7 parition Layout

    Posted Jul 20, 2021 09:00 AM

    Hello Forum,

    i have a question about esxi 7 partition layout. After doing some research i saw that there is a new partiton layout and also a new requirement for sizing the disk.

    We are using boot from SAN with a size of 20 GB LUN. Recomended size for booting from disk is 32 gb. 

    Now i am thinking of do i have to resize the disk and when resizing how does esxi recognize the new size? Or is 20 gb fine and i can run it with this size as well.

    Thanks for any hints on this.


  • 2.  RE: ESXi 7 parition Layout

  • 3.  RE: ESXi 7 parition Layout

    Posted Jul 20, 2021 11:34 AM

    At the end of the first link, the recomended size is min 32 gb


    • 32GB for other boot devices like hard disks, or flash media like SSD or NVMe devices."

    So now, my size is 20 gb. I could easily change the luns size. but how adopt that to esxi? How to resize the esxi partition size?

    Or is there a script that automaticaly change the paritions if more size is available. 


  • 4.  RE: ESXi 7 parition Layout

    Posted Jul 21, 2021 08:53 AM


    did the following.

    1. grow san disk
    2. ssh to esx
    3. get disk path to OSDATA LUN 
      1. df -h show the disk path
    4. get partition of vmfs-l
      1. vmkfstools -P /vmfs/volumes/OSDATA-60cc............ 
      2. normaly partition 7
    5. Because of add space you need to correct partition table
      1. partedUtil fixGpt /vmfs/devices/disks/naa.600a098........
    6. Get usable sectors of the disk
      1. partedUtil getUsableSectors /vmfs/devices/disks/naa.600a09
    7. resize partition
      1. partedUtil resize /vmfs/devices/disks/naa.600a098... <partition_number> <starting sector>  <end sector>
    8. grow file system
      1. vmkfstools --growfs /vmfs/devices/disks/naa.60....:<partition_number>  /vmfs/devices/disks/naa.60....:<partition_number>


  • 5.  RE: ESXi 7 parition Layout

    Posted Jul 22, 2021 04:08 AM

    The only constant here is the system boot partition. ... When a secondary high-endurance storage device is not available, VMFS-L Locker partition is created on USB or SD devices, but this partition is used only to store ROM-data. RAM-data is stored on a RAM disk.