vSAN & HCI interview questions

1. A.Native NFS and SMB file shares served by agent VMs running on the vSAN cluster.
2. B.A dedicated appliance holding only witness components for two-node or stretched vSAN clusters, breaking quorum without storing data
3. C.Single-tier all-NVMe architecture in vSAN 8; cannot be upgraded in place from OSA and requires new deployment.
4. D.An architecture that pools the local disks of compute nodes into a software-defined shared storage layer, eliminating a separate SAN

Answer + AI explanation with Pro

1. A.Capacity reserve (slack space)
2. B.Nested fault domains
3. C.Hyperconverged infrastructure (HCI)
4. D.vSAN per-TiB licensing

Answer + AI explanation with Pro

1. A.Hyperconverged infrastructure (HCI) — The site that keeps running VMs when the inter-site link fails; the witness arbitrates ownership.
2. B.Hyperconverged infrastructure (HCI) — Operations reserve and host-rebuild reserve set aside so vSAN can rebuild and rebalance without filling the datastore.
3. C.Hyperconverged infrastructure (HCI) — An architecture that pools the local disks of compute nodes into a software-defined shared storage layer, eliminating a separate SAN
4. D.Hyperconverged infrastructure (HCI) — Single-tier all-NVMe architecture in vSAN 8; cannot be upgraded in place from OSA and requires new deployment.

Answer + AI explanation with Pro

1. A.Operations reserve and host-rebuild reserve set aside so vSAN can rebuild and rebalance without filling the datastore.
2. B.The vSAN 8 single-tier all-NVMe architecture with no disk groups, where every device contributes both cache and capacity for higher performance and efficiency
3. C.The ESA design that writes incoming data and metadata into a log first, enabling space-efficient RAID-5/6 with near RAID-1 performance
4. D.An architecture that pools the local disks of compute nodes into a software-defined shared storage layer, eliminating a separate SAN

Answer + AI explanation with Pro

1. A.RAID-5/6 erasure coding
2. B.vSAN ESA (Express Storage Architecture)
3. C.Failures To Tolerate (FTT)
4. D.Nested fault domains

Answer + AI explanation with Pro

1. A.vSAN ESA (Express Storage Architecture) — The vSphere 8 U3 model that licenses vSAN by tebibytes of capacity consumed rather than per CPU core, including a base TiB entitlement per VCF/VVF core
2. B.vSAN ESA (Express Storage Architecture) — The vSAN 8 single-tier all-NVMe architecture with no disk groups, where every device contributes both cache and capacity for higher performance and efficiency
3. C.vSAN ESA (Express Storage Architecture) — A disaggregated deployment where dedicated vSAN ESA storage clusters serve capacity to separate compute-only vSphere clusters over the network
4. D.vSAN ESA (Express Storage Architecture) — The ESA design that writes incoming data and metadata into a log first, enabling space-efficient RAID-5/6 with near RAID-1 performance

Answer + AI explanation with Pro

1. A.A dedicated appliance holding only metadata to break ties in stretched or two-node vSAN clusters.
2. B.Built-in proactive tests for network, disk, hardware compatibility, and capacity surfaced in Skyline Health.
3. C.The ESA design that writes incoming data and metadata into a log first, enabling space-efficient RAID-5/6 with near RAID-1 performance
4. D.vSAN OSA space-efficiency features enabled per cluster; ESA performs compression per object more granularly and always on

Answer + AI explanation with Pro

1. A.Failures to Tolerate (FTT)
2. B.Capacity reserve (slack space)
3. C.vSAN ESA log-structured filesystem
4. D.vSAN OSA (Original Storage Architecture)

Answer + AI explanation with Pro

1. A.vSAN ESA log-structured filesystem — Stretched-cluster construct providing both site-level and local host-level redundancy within each site.
2. B.vSAN ESA log-structured filesystem — vSAN OSA space-efficiency features enabled per cluster; ESA performs compression per object more granularly and always on
3. C.vSAN ESA log-structured filesystem — Disaggregated storage-only vSAN clusters that serve capacity to compute clusters over the network.
4. D.vSAN ESA log-structured filesystem — The ESA design that writes incoming data and metadata into a log first, enabling space-efficient RAID-5/6 with near RAID-1 performance

Answer + AI explanation with Pro

1. A.vSAN OSA space-efficiency features enabled per cluster; ESA performs compression per object more granularly and always on
2. B.An architecture that pools the local disks of compute nodes into a software-defined shared storage layer, eliminating a separate SAN
3. C.The classic two-tier vSAN design using disk groups of one cache device plus capacity devices, still supported alongside ESA in vSAN 8
4. D.Stretched-cluster construct providing both site-level and local host-level redundancy within each site.

Answer + AI explanation with Pro

1. A.vSAN ESA log-structured filesystem
2. B.RAID-5 capacity on ESA
3. C.vSAN OSA (Original Storage Architecture)
4. D.Failures to Tolerate (FTT)

Answer + AI explanation with Pro

1. A.vSAN OSA (Original Storage Architecture) — A vSAN grouping (rack or site) used to place object replicas so a whole rack or site failure does not lose data
2. B.vSAN OSA (Original Storage Architecture) — The classic two-tier vSAN design using disk groups of one cache device plus capacity devices, still supported alongside ESA in vSAN 8
3. C.vSAN OSA (Original Storage Architecture) — Disaggregated storage-only vSAN clusters that serve capacity to compute clusters over the network.
4. D.vSAN OSA (Original Storage Architecture) — Space-efficiency feature; in OSA it is per disk group, while ESA does always-on compression per object.

Answer + AI explanation with Pro

1. A.An architecture that pools the local disks of compute nodes into a software-defined shared storage layer, eliminating a separate SAN
2. B.A vSAN grouping (rack or site) used to place object replicas so a whole rack or site failure does not lose data
3. C.An OSA construct grouping one flash cache device with up to seven capacity devices; ESA removes this concept entirely
4. D.Chooses RAID-1 mirroring (performance, more capacity) or RAID-5/6 erasure coding (space efficient) for an object.

Answer + AI explanation with Pro

1. A.vSAN Max
2. B.Capacity reserve (slack space)
3. C.vSAN disk group
4. D.vSAN ESA Data Protection

Answer + AI explanation with Pro

1. A.vSAN disk group — Native snapshot-based local and remote protection in vSAN 8 ESA using the efficient log-structured format, integrated with the vSphere client
2. B.vSAN disk group — An architecture that pools the local disks of compute nodes into a software-defined shared storage layer, eliminating a separate SAN
3. C.vSAN disk group — An OSA construct grouping one flash cache device with up to seven capacity devices; ESA removes this concept entirely
4. D.vSAN disk group — Space-efficiency feature; in OSA it is per disk group, while ESA does always-on compression per object.

Answer + AI explanation with Pro

1. A.The site that keeps running VMs when the inter-site link fails; the witness arbitrates ownership.
2. B.The ESA design that writes incoming data and metadata into a log first, enabling space-efficient RAID-5/6 with near RAID-1 performance
3. C.Native NFS and SMB file shares served by agent VMs running on the vSAN cluster.
4. D.A disaggregated deployment where dedicated vSAN ESA storage clusters serve capacity to separate compute-only vSphere clusters over the network

Answer + AI explanation with Pro

1. A.Failure Tolerance Method (FTM)
2. B.vSAN Max
3. C.Resync
4. D.Hyperconverged infrastructure (HCI)

Answer + AI explanation with Pro

1. A.vSAN Max — On-disk metadata version of vSAN objects; upgrades unlock new features and may require a rolling resync.
2. B.vSAN Max — Chooses RAID-1 mirroring (performance, more capacity) or RAID-5/6 erasure coding (space efficient) for an object.
3. C.vSAN Max — A disaggregated deployment where dedicated vSAN ESA storage clusters serve capacity to separate compute-only vSphere clusters over the network
4. D.vSAN Max — An architecture that pools the local disks of compute nodes into a software-defined shared storage layer, eliminating a separate SAN

Answer + AI explanation with Pro

1. A.A dedicated appliance holding only metadata to break ties in stretched or two-node vSAN clusters.
2. B.Space-efficiency feature; in OSA it is per disk group, while ESA does always-on compression per object.
3. C.A vSAN storage policy setting defining how many host or disk failures an object can survive, implemented via mirroring or erasure coding
4. D.The vSAN 8 single-tier all-NVMe architecture with no disk groups, where every device contributes both cache and capacity for higher performance and efficiency

Answer + AI explanation with Pro

1. A.RAID-5 capacity on ESA
2. B.Failures to Tolerate (FTT)
3. C.vSAN disk group
4. D.RAID-5/6 erasure coding

Answer + AI explanation with Pro

1. A.Failures to Tolerate (FTT) — Group hosts (for example by rack) so vSAN places replicas across domains, surviving a whole-rack failure.
2. B.Failures to Tolerate (FTT) — Storage policy rule defining how many host or device failures an object survives, typically FTT=1 or FTT=2.
3. C.Failures to Tolerate (FTT) — A vSAN storage policy setting defining how many host or disk failures an object can survive, implemented via mirroring or erasure coding
4. D.Failures to Tolerate (FTT) — Space-efficiency feature; in OSA it is per disk group, while ESA does always-on compression per object.

Answer + AI explanation with Pro

1. A.A vSAN space-efficient redundancy method storing parity instead of full mirrors; ESA makes it performant enough to be the default for FTT protection
2. B.Space-efficiency feature; in OSA it is per disk group, while ESA does always-on compression per object.
3. C.Stretched-cluster construct providing both site-level and local host-level redundancy within each site.
4. D.The vSphere 8 U3 model that licenses vSAN by tebibytes of capacity consumed rather than per CPU core, including a base TiB entitlement per VCF/VVF core

Answer + AI explanation with Pro

1. A.Failure Tolerance Method (FTM)
2. B.RAID-5/6 erasure coding
3. C.Failures To Tolerate (FTT)
4. D.vSAN ESA Data Protection

Answer + AI explanation with Pro

1. A.RAID-5/6 erasure coding — The vSAN 8 single-tier all-NVMe architecture with no disk groups, where every device contributes both cache and capacity for higher performance and efficiency
2. B.RAID-5/6 erasure coding — The vSphere 8 U3 model that licenses vSAN by tebibytes of capacity consumed rather than per CPU core, including a base TiB entitlement per VCF/VVF core
3. C.RAID-5/6 erasure coding — Single-tier all-NVMe architecture in vSAN 8; cannot be upgraded in place from OSA and requires new deployment.
4. D.RAID-5/6 erasure coding — A vSAN space-efficient redundancy method storing parity instead of full mirrors; ESA makes it performant enough to be the default for FTT protection

Answer + AI explanation with Pro

1. A.The vSphere 8 U3 model that licenses vSAN by tebibytes of capacity consumed rather than per CPU core, including a base TiB entitlement per VCF/VVF core
2. B.Built-in proactive tests for network, disk, hardware compatibility, and capacity surfaced in Skyline Health.
3. C.Stretched-cluster construct providing both site-level and local host-level redundancy within each site.
4. D.Background rebuild of object components after a failure, policy change, or rebalance, throttled to protect VM I/O.

Answer + AI explanation with Pro

1. A.vSAN per-TiB licensing
2. B.RAID-5/6 erasure coding
3. C.Failure Tolerance Method (FTM)
4. D.vSAN File Services

Answer + AI explanation with Pro

1. A.vSAN per-TiB licensing — Disaggregated storage-only vSAN clusters that serve capacity to compute clusters over the network.
2. B.vSAN per-TiB licensing — A dedicated appliance holding only metadata to break ties in stretched or two-node vSAN clusters.
3. C.vSAN per-TiB licensing — The vSphere 8 U3 model that licenses vSAN by tebibytes of capacity consumed rather than per CPU core, including a base TiB entitlement per VCF/VVF core
4. D.vSAN per-TiB licensing — A disaggregated deployment where dedicated vSAN ESA storage clusters serve capacity to separate compute-only vSphere clusters over the network

Answer + AI explanation with Pro

1. A.vSAN OSA space-efficiency features enabled per cluster; ESA performs compression per object more granularly and always on
2. B.Native snapshot-based local and remote protection in vSAN 8 ESA using the efficient log-structured format, integrated with the vSphere client
3. C.A vSAN space-efficient redundancy method storing parity instead of full mirrors; ESA makes it performant enough to be the default for FTT protection
4. D.Built-in proactive tests for network, disk, hardware compatibility, and capacity surfaced in Skyline Health.

Answer + AI explanation with Pro

1. A.vSAN ESA Data Protection
2. B.vSAN Max
3. C.RAID-5 capacity on ESA
4. D.Fault domains

Answer + AI explanation with Pro

1. A.vSAN ESA Data Protection — Background rebuild of object components after a failure, policy change, or rebalance, throttled to protect VM I/O.
2. B.vSAN ESA Data Protection — Native snapshot-based local and remote protection in vSAN 8 ESA using the efficient log-structured format, integrated with the vSphere client
3. C.vSAN ESA Data Protection — Native NFS and SMB file shares served by agent VMs running on the vSAN cluster.
4. D.vSAN ESA Data Protection — Disaggregated storage-only vSAN clusters that serve capacity to compute clusters over the network.

Answer + AI explanation with Pro