DELL ME5024 – Volume Capacity shown in Operating System is less than what is shown in Management

DELL ME5024 – Volume Capacity shown in Operating System is less than what is shown in Management

to our lab just arrived one of the DELL ME 5024 storage array, when i create a volume inside a ME5024 management GUI, the volume has size 500 GB (499,9 GB) but when i attach this volume to the ESXi host – 25 GbE iSCSI, the host only see the volume size 465.66 GB. 

new volume with size 500 GB (499.9GB)

new volume with size 500 GB (499.9GB)

the esxi host see only 465.66 GB

why ? 

its simple, because the DELL ME storage array (4xxx series and 5xxx) MESM displays space in decimal format (base-10), by default.  Operating systems display storage space (volumes) in binary format (base-2) and this is the reason for the apparent discrepancy.

In the Web GUI of ME5xxx is not possible to change base-10 to base-2, like on the ME4xxx series. yes you can use the some calculators on the web, but i used the CLI interface for create volumes on ME5024, follow my steps: 

  • run ssh client to ME 5024 and login 

show cli-parameters 

as you can see, the system using the base-10 

set cli-parameters base 2

show cli-parameters

create volume SSD pool A size 6.5TB tier-affinity performance

show volumes

as you can see the the volume has 7146.8 GB (created in CLI with base-2), so i map volume to the host group and rescan iSCSI adapter on the ESXi node. 

now i see the „correct size“ of the mapped volume. 

https://www.dell.com/support/kbdoc/cs-cz/000177925/powervault-me4-volume-capacity-shown-in-operating-system-is-less-than-what-is-shown-in-mesm-cli?lang=en

 

 

 

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