Dell EMC Unity:Customer is reporting high pool oversubscription (User Correctable)
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Instructions
Customer is having 219% pool subscription however pool is still having nearly 50 % free capacity on the mentioned pool as per below:
Each snap subscription equal to the FS/LUN size. If file system/lun size is 5 TB, each snap for this fs/lun subscription will be 5 TB. This is because in worse case scenario each snap potentially might need the same amount of space as the production file system/lun. For example, if you have a 5 TB file system and you fill it up completely, then take a snap, then delete everything from the file system, and fill it up again with different data - in this scenario the snap will consume 5TB and the FS will consume 5 TB. Snap subscription takes into account the worse case scenario.
Please note that how oversubscription is calculated is mentioned clearly on this KB: https://support.emc.com/kb/491974
On analysing the FS on the pool, it was found that there is a 5 TB FS with 18 snaps as per below:
Please note that how oversubscription is calculated is mentioned clearly on this KB: https://support.emc.com/kb/491974
Affected Products
Dell EMC Unity FamilyProducts
Dell Unity 300, Dell EMC Unity 300F, Dell EMC Unity 350F, Dell EMC Unity 400, Dell EMC Unity 450F, Dell EMC Unity 500, Dell EMC Unity 500F, Dell EMC Unity 550F, Dell EMC Unity 600, Dell EMC Unity 600F, Dell EMC Unity 650F
, Dell EMC Unity Family |Dell EMC Unity All Flash, Dell EMC Unity Family
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Article Properties
Article Number: 000022447
Article Type: How To
Last Modified: 16 Oct 2025
Version: 3
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