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STORAGE REDUCTION INFORMATION
Hi all in the community,
I am asking regarding the Storage reduction in unity products. i have a pool that is configured with several LUNs creating data store in VMware. Data Store are full But at LUN level we still have a lot more storage left. Please assist with information on relation ship between storage Pool usage and Actual storage usage in Data store level.
If i have a pool that has 72TB can i create a storage LUN with total Size more than 72TB when i have LUN data reduction enabled?
Assist on how we can use the data store reduction in VMware enviroment
cadencep45
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November 18th, 2019 04:00
this is "take with a grain of salt" caveat as this is top of the head stuff
You can create LUN up to max size in unity
when its initially created, it will take up 0 space + metadata space
As you write data and if you have dedupe enabled, it takes the inbound write and tries to do both
dedupe ( if a similar string is written to pool, simply create pointer to that )
compress ( if string is compressable ( emc 'secret sauce' algorithm it will compress )
so hence the lun written data may be smaller than written data.
For light reading, see https://www.dellemc.com/resources/en-us/asset/white-papers/products/storage/h16870-dell_emc_unity-data_reduction.pdf