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TingYinHuang
Contributor
Contributor
‎07-01-2018 11:26 PM

Disk group question

Dears :

In my vSAN environment, there are 3 esxi hosts in cluster , each esxi have 1x 800GB SSD for cache , 7x 1.2TB SAS Disk for Capacity, which buliding hybrid vSAN, and offering about 20TB vSAN datastore.

I want to extend my vSAN Datastore, but this time i will use different Disk Capacity, maybe with 1x1.2TB SSD for cache , 7x 2TB SAS Disk for Capacity, for each esxi.

In this case , Can I add these space to the existing 20TB Datastore and grow it to about 50TB?

or should I creater another vSAN Datastore about 30 TB with these new disk?

Are these 2 way supported?

Which one is much recommendable?

thanks.

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TheBobkin
Champion
Champion
‎07-02-2018 10:32 AM

Hello TingYinHuang​,

Welcome to Communities! Some useful info on participating here:

https://communities.vmware.com/docs/DOC-12286

"In this case , Can I add these space to the existing 20TB Datastore and grow it to about 50TB?"

Yes of course - the vsanDatastore will be able to use the space as soon as the Disk-Groups are created.

"or should I creater another vSAN Datastore about 30 TB with these new disk?"

"Are these 2 way supported?"

No - only one vsanDatastore per cluster is possible.

"but this time i will use different Disk Capacity, maybe with 1x1.2TB SSD for cache , 7x 2TB SAS Disk for Capacity, for each esxi"

Just an FYI - vSAN won't really utilise any extra space past 600GB on cache-tier devices (other than for increasing lifespan e.g. replacing dead blocks) so there isn't much benefit to using cache-tier devices larger than ~800GB. If you want to keep the cache:capacity ratio similar to what it is then take this into account and considering adding 2x smaller capacity Disk-Groups (e.g. 2x(600GB cache-tier + 3-4 2TB capacity-tier)).

Bob

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