| None Preferred |
No data redundancy |
Site A or B |
Host failure Site A |
Objects are inaccessible if failed host contained one or more components of objects |
VM cannot be restarted as object is inaccessible |
| None Preferred |
RAID-1/5/6 |
Site A or B |
Host failure Site A |
Objects are accessible as there's site local resiliency |
VM does not need to be restarted, unless VM was running on failed host |
| None Preferred |
No data redundancy / RAID-1/5/6 |
Site A |
Full failure Site A |
Objects are inaccessible as full site failed |
VM cannot be restarted in Site B, as all objects reside in Site A |
| None Preferred |
No data redundancy / RAID-1/5/6 |
Site B |
Full failure Site B |
Objects are accessible, as only Site A contains objects |
VM can be restarted in Site A, as that is where all objects reside |
| None Preferred |
No data redundancy / RAID-1/5/6 |
Site A |
Partition Site A |
Objects are accessible as all objects reside in Site A |
VM does not need to be restarted |
| None Preferred |
No data redundancy / RAID-1/5/6 |
Site B |
Partition Site B |
Objects are accessible in Site A, objects are not accessible in Site B as network is down |
VM is restarted in Site A, and killed by vSAN in Site B |
| None Secondary |
No data redundancy / RAID-1/5/6 |
Site B |
Partition Site B |
Objects are accessible in Site B |
VM resides in Site B, does not need to be restarted |
| None Preferred |
No data redundancy / RAID-1/5/6 |
Site A |
Witness Host Failure |
No impact, witness host is not used as data is not replicated |
No impact |
| None Secondary |
No data redundancy / RAID-1/5/6 |
Site B |
Witness Host Failure |
No impact, witness host is not used as data is not replicated |
No impact |
| Site Mirroring |
No data redundancy |
Site A or B |
Host failure Site A or B |
Components on failed hosts inaccessible, read and write IO across ISL as no redundancy locally, rebuild across ISL |
VM does not need to be restarted, unless VM was running on failed host |
| Site Mirroring |
RAID-1/5/6 |
Site A or B |
Host failure Site A or B |
Components on failed hosts inaccessible, read IO locally due to RAID, rebuild locally |
VM does not need to be restarted, unless VM was running on failed host |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site A |
Full failure Site A |
Objects are inaccessible in Site A as full site failed |
VM restarted in Site B |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site A |
Partition Site A |
Objects are inaccessible in Site A as full site is partitioned and quorum is lost |
VM restarted in Site B |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site A |
Witness Host Failure |
Witness object inaccessible, VM remains accessible |
VM does not need to be restarted |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site B |
Full failure Site A |
Objects are inaccessible in Site A as full site failed |
VM does not need to be restarted as it resides in Site B |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site B |
Partition Site A |
Objects are inaccessible in Site A as full site is partitioned and quorum is lost |
VM does not need to be restarted as it resides in Site B |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site B |
Witness Host Failure |
Witness object inaccessible, VM remains accessible |
VM does not need to be restarted |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site A |
Network failure between Site A and B (ISL down) |
Site A binds with witness, objects in Site B becomes inaccessible |
VM does not need to be restarted |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site B |
Network failure between Site A and B (ISL down) |
Site A binds with witness, objects in Site B becomes inaccessible |
VM restarted in Site A |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site A or Site B |
Network failure between Witness and Site A/B |
Witness object inaccessible, VM remains accessible |
VM does not need to be restarted |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site A |
Full failure Site A, and simultaneous Witness Host Failure |
Objects are inaccessible in Site A and Site B due to quorum being lost |
VM cannot be restarted |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site A |
Full failure Site A, followed by Witness Host Failure a few minutes later |
Pre vSAN 7.0 U3: Objects are inaccessible in Site A and Site B due to quorum being lost |
VM cannot be restarted |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site A |
Full failure Site A, followed by Witness Host Failure a few minutes later |
Post vSAN 7.0 U3: Objects are inaccessible in Site A, but accessible in Site B as votes have been recounted |
VM restarted in Site B |
| Site Mirroring |
No data redundancy / RAID-1/5/6 |
Site B |
Full failure Site B, followed by Witness Host Failure a few minutes later |
Post vSAN 7.0 U3: Objects are inaccessible in Site B, but accessible in Site A as votes have been recounted |
VM restarted in Site A |
| Site Mirroring |
No data redundancy |
Site A |
Full failure Site A, and simultaneous host failure in Site B |
Objects are inaccessible in Site A, if components reside on failed host then object is inaccessible in Site B |
VM cannot be restarted |
| Site Mirroring |
No data redundancy |
Site A |
Full failure Site A, and simultaneous host failure in Site B |
Objects are inaccessible in Site A, if components do not reside on failed host then object is accessible in Site B |
VM restarted in Site B |
| Site Mirroring |
RAID-1/5/6 |
Site A |
Full failure Site A, and simultaneous host failure in Site B |
Objects are inaccessible in Site A, accessible in Site B as there's site local resiliency |
VM restarted in Site B |
RSS
