shankarsingh
Enthusiast
Enthusiast

Datastore does not match current VM policy. Storage Fault has occurred

Hi

Need an help to setup VM storage policy of RAID5 with FTT=1 with dedup and compression enabled vSAN Datastore.

We have 6 hosts(7.0 U1)  in cluster with All Flash VSAN with vCenter  7.0 U2 (Dedup and compression enabled vSAN) .

When I m creating VM storage policy ,I selected below attributes where I can not see vSAN datastore under compatible  list and its shows under Incompatible .

As I can see message on VSAN datastore under incompatible list with “Datastore does not match current VM policy. Storage Fault has occurred “

Avavibility

Site disaster tolerance : None-stretched cluster

Failure to tolerance : 1 failure-RAID5(Erasure Coding)

Storage Rule

Encryption service : No preference

Space Efficiency : Deduplication and compression

Storage Tire: All Flash

 

So can please some one suggest /help me that can’t we enable dedup and compression on VM Storage Policy with RAID5 with FTT=1 with All Flash VSAN ?

Thanks in advance

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TheBobkin
VMware Employee
VMware Employee

@shankarsingh , does the cluster have a vSAN Advanced or higher license applied?(this is a requirement for RAID5)

 

Do at least 4 nodes have Disk-Groups configured?

 

None of the nodes have been placed in Fault Domains?

 

Check if even a RAID1 or RAID0 Storage Policy shows as compliant to rule out a general SPS issue 

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kollishankar
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Contributor

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TheBobkin
VMware Employee
VMware Employee

Re-read this, "Site disaster tolerance : None-stretched cluster" - if this is a Stretched cluster (3+3+1) then you cannot use RAID5 (either as site local-only or RAID5+RAID5 mirrored) as this requires a minimum of 4 nodes in a single site/per site.

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shankarsingh
Enthusiast
Enthusiast

Yes we do have vSAN vSAN Advanced license.

Do at least 4 nodes have Disk-Groups configured? All 6 hosts have disks groups .Each hosts has 2 Disks groups 

None of the nodes have been placed in Fault Domains-NO ,Each host acts as standalone fault domain .However i just now created Fault Domain and added all 6 host in single Fault domain ,But still we have same issue.

We can create  RAID1 SP and can apply VM to RAID1.Even i can create RAID5 VM storage policy if i disable /select "No preference " in Storage Efficiency of policy .

Sorry Site disaster tolerance : None-Standard cluster (Not stretched cluster)

Thanks in advance for your help 

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TheBobkin
VMware Employee
VMware Employee

@shankarsingh , Please confirm whether this is a Stretched cluster or not - if it is then there *should* be 2 Fault Domains (each with 3 data-nodes) configured + Witness.

 

If this is the case then you cannot use RAID5 as a Storage Policy on either single site as each only has 3 nodes for component placement whereas RAID5 requires 4 nodes - by 'No preference' do you mean a policy that isn't pinned to one site? If so then that is basically going to be RAID5 across sites which would likely have poor performance and is very likely not what you want here.

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shankarsingh
Enthusiast
Enthusiast

Bobkin, Thanks for your response and assistance so far.

It’s not stretched cluster .It's  6 Hosts in vSAN cluster with each standalone hosts/faulty domain .

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