storage service component

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Presentation transcript:

storage service component Storage Architecture file, (object) VNF/VNFC storage service component NFVI block, file, object block, file, object VIM distributed storage Hardware host host storage array Ctrl1 Crtl2 switch switch

Storage HA – Network Failure block, file, object block, file, object VIM distributed storage host host storage array Ctrl1 Crtl2 switch switch Storage network link fails Storage network detects failure Storage network switches to standby link(s) iSCSI multi-pathing bonding Report failure to O&M

Storage HA – Failure in Storage Array block, file, object block, file, object VIM distributed storage host host storage array Ctrl1 Crtl2 switch switch Component within storage array fails Array-internal fail-over kicks in RAID Redundant controllers, NICs, … Report failure to O&M

Storage HA – Host Failure block, file, object block, file, object VIM distributed storage host host storage array Ctrl1 Crtl2 switch switch Storage host fails Distributed storage layer detects failure Distributed storage layer rebalances data

Non-HA Block Storage (legacy) Mirroring of block devices on VNF level VNF VNFC (active) VNFC (passive) mirroring NFVI

HA Block Storage Active/passive configuration Failover supervised by clustering software in VNF Requires multi-attach capability of Cinder VNF VNFM VNFC (active) VNFC (standby) VNFC (active) NFVI VIM

HA Block Storage Active/active configuration Clustered file system enables concurrent access Requires multi-attach capability of Cinder VNF VNFM VNFC (active) VNFC (active) NFVI VIM

VNF level HA for Multiple Backends Block devices provided by multiple backends Mirroring of block devices on VNF level Pro-active failover possible NFVI VNF VNFC (active) (passive) mirroring VNFM VIM backend 1 backend 2

Open Questions Can NFVI storage system provide sufficient level of HA to meet SAL levels? Failover/recovery times heavily depend on deployed solution How much does rebuild of data impact performance?

File Storage Legacy deployments NFVI File storage service provided by VNFC Layered on top of block storage services NFVI File storage service provided by NFVI / hardware Openstack Manila

Ephemeral Storage Ephemeral Storage Main use: File systems of VMs booted from image Location On local disks of compute host Isolation of failover domains VM unaffected by failure of storage system Disk failure corresponds to host failure Limits live migration capabilities On distributed or external storage Correlated failures possible Failure of storage backend impacts VMs Properties of respective storage backend apply