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Avishay trager cinder-grizzly-deep-dive
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© 2013 IBM
CorporationMay 2013 OpenStack Cinder Deep Dive Grizzly Release Avishay Traeger <avishay@il.ibm.com> IBM Research – Haifa OpenStack Cinder Core Team Member
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2 © 2013 IBM
Corporation Cinder Overview Cinder manages persistent storage – Data volumes that are attached to VM instances – Boot from volume Project exists since Folsom release, spun off from Nova-volume Volumes have a lifecycle independent of VM instances For example: – Cinder: create volume – Nova: boot VM instance – Nova: attach volume to instance (will call Cinder) – (More details later)
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Corporation Architectural Overview cinder-api cinder-scheduler cinder-volume cinder-backup SQL DB cinder client REST AMPQAMPQ AMPQ
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Corporation Architectural Overview cinder-api cinder-scheduler cinder-volume cinder-backup SQL DB cinder client REST AMPQAMPQ AMPQ
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Corporation cinder-api Volume create/delete/list/show – Create from volume, image, snapshot Snapshot create/delete/list/show Volume attach/detach (called by Nova) Others: – Volume types (more later) – Quotas – Backups cinder-api
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Corporation Architectural Overview cinder-api cinder-scheduler cinder-volume cinder-backup SQL DB cinder client REST AMPQAMPQ AMPQ
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Corporation cinder-volume Main components: API: for cinder-api to communicate with cinder-volume Manager: Generic code to implement API Drivers: Called by Manager, contains back-end-specific code to communicate with various storage types (e.g., Linux LVM, storage controllers from various vendors, distributed file systems, etc.) ➢ Admin can run multiple cinder-volume instances, each with its own configuration file describing settings and the storage back-end ➢ As of Grizzly, one cinder-volume instance can manage multiple back-ends ➢ Each back-end driver is generally configured to interact with one storage pool ➢ Multi-threading cinder-volume
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Corporation Example: High-Level Data and Control Flow 1 Nova VM instance /dev/vda KVM iSCSI initiator Cinder /dev/hda Linux Volume Manager iSCSI target Legend Persistent volume control Persistent volume data
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Corporation Example: High-Level Data and Control Flow 2 Storage Controller Nova VM instance /dev/vda KVM iSCSI initiator Cinder iSCSI target Legend Persistent volume control Persistent volume data Note that iSCSI is just an example – several additional protocols are supported (e.g., FC, NFS)
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Corporation Example: Flow for attach a volume to instance 1. Nova calls Cinder via its API, passing connection information e.g., host name, iSCSI initiator name, FC WWPNs 2. cinder-api passes message to cinder-volume 3. Manager does initial error checking and calls volume driver 4. Volume driver does any necessary preparation to allow the connection e.g., give the nova host permissions to access the volume 5. Volume driver returns connection information, which is passed to Nova e.g., iSCSI iqn and portal, FC WWPN 6. Nova creates the connection to the storage using the returned information 7. Nova passes the volume device/file to the hypervisor
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Corporation Architectural Overview cinder-api cinder-scheduler cinder-volume cinder-backup SQL DB cinder client REST AMPQAMPQ AMPQ
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Corporation cinder-scheduler Chooses which back-end to place a new volume on Configurable plugins for filters and weights 1. Starts with list of all back-ends 2. Filters according to capabilities Drivers report capabilities and state (e.g., free space) Admins create volume_types which specify requirements Users optionally specify a volume_type when creating a volume 3. Sorts according to weights e.g., available free space 4. Returns best candidate cinder-scheduler
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Corporation Scheduler / volume_types example
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Corporation Scheduler / volume_types example
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Corporation Scheduler / volume_types example HDDs Compressed Flash/HDD Flash
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Corporation Scheduler / volume_types example
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Corporation Looking Forward to Havana: Features Code cleanup and reorganization Attach volume to multiple hosts Read-only volumes ACLs Disk encryption FC SAN Zone / Access Control management Transfer volume ownership Volume Migration Work towards locality between instances and volumes Scheduler hints Volume rate limiting
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Corporation Looking Forward to Havana: New Drivers IBM GPFS IBM zVM EMC Isilon (iSCSI) Local disk partitions Hitachi HUS (DF850) (iSCSI) Dell Equalogic Violin Memory v6000 (iSCSI) Current drivers: Coraid (AoE) EMC VMAX/VNX (iSCSI) GlusterFS (GlusterFS) HP 3PAR (iSCSI/FC) HP LeftHand (iSCSI) Huawei T-series/Dorado (iSCSI) IBM Storwize family/SVC (iSCSI/FC) IBM XIV (iSCSI), LVM (iSCSI) NetApp (iSCSI/NFS) Nexenta (iSCSI) NFS (NFS) RBD (Ceph) Scality SOFS (scality) Sheepdog (sheepdog) Solaris (iSCSI) SolidFire (iSCSI) Windows Server 2012 (iSCSI) Zadara (iSCSI)
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Corporation