Archipelago: New Cloud Storage Backend of GRNET

Transcription

1 Archipelago: New Cloud Storage Backend of GRNET Filippos Giannakos Chrysostomos Nanakos Greek Research and Technology Network (GRNET) S.A. 16 th TF-Storage Meeting February 13, 2015 F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 1 / 21

2 Background & Motivation Background Background Synnefo OpenStack compatible cloud platform Powers: ~okeanos ~okeanos-global F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 2 / 21

3 Background & Motivation Motivation Motivation Pithos (Storage Sevice) Swift API Uploaded Files / Images Plankton (Image Service) Glance API Registered Images Cyclades (Compute/Network/Volume Service) Nova/Neutron/Cinder API Virtual Disks / Volumes F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 3 / 21

4 Background & Motivation Motivation Unified View of Storage Resources Files User files, with Dropbox-like syncing. Images Templates for VM creation. Volumes Live disks, as seen from VMs. Snapshots Point in time snapshots of volumes. F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 4 / 21

5 Archipelago Features Storage Features Archipelago Storage Virtualization System Powering storage in Synnefo Decouples storage resources from storage backends Files / Images / Volumes / Snapshots Unified way to provision, handle, and present resources Decouples logic from actual physical storage Software-Defined Storage F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 5 / 21

6 Archipelago Features Storage Features Backend Agnostic Advantages: No vendor lock-in Migration from one storage backend to another Possibility of combining backends ~okeanos started with NFS and migrated to RADOS F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 6 / 21

7 Archipelago Features Storage Features Storage Backend for the Cloud With Archipelago we offer: Deduplication Syncable File/Image upload with partial upload Image Registration Thin clones Downloadable thin snapshots with zero data movement. F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 7 / 21

8 Archipelago Features Services Overview Services Overview F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 8 / 21

9 Under the Hood Everything is a Resource How it is Done Everything is a resource on Archipelago The same resource is exposed as: A file through the API of the Storage Service (Pithos) An image through the API of the Image Service A live disk / VM volume through the API of the Volume Service A snapshot through the API of the Volume Service All data remain in one place No copying of data around F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 9 / 21

10 Under the Hood Mapfiles Mapfiles Mapfile for each resource Keeps track of the mappings from resource offset to objects Keeps metadata information for each resource Operates on mapfiles not on the actual data F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 10 / 21

11 Under the Hood Mapfiles From Mapfiles to Data F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 11 / 21

12 Under the Hood Architecture High Level Architecture F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 12 / 21

13 Under the Hood Architecture Low level Architecture Same Archipelago software stack on each node Modular/Pluggable architecture Distinct processes Communicate via requests on a shared memory segment F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 13 / 21

14 Under the Hood Architecture Low level Architecture F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 14 / 21

15 Under the Hood Architecture Core Volume composer Composes resource I/O from individual objects Mapper Keeps and updates the mappings from resource offsets to individual objects which actually hold the data Flexible I/O pipeline Can be extended with other components offering common functionality F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 15 / 21

16 Under the Hood Interfaces Client Endpoints Upstream Native QEMU virtio driver VM interface Blktap2 driver Admin/VM interface Pithos Web interface / REST API F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 16 / 21

17 Under the Hood Interfaces Backend Drivers Currently supported backends: Files (Any FS with POSIX semantics) RADOS (Using native librados interface) GlusterFS (Using native libgfapi interface) S3/SWIFT (Experimental) General: Anything that can support object semantics F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 17 / 21

18 Advantages over other Solutions Advantages over other Solutions Allows for resource composition from already existing objects Standalone resources Unified view of all cloud resources Backend agnostic F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 18 / 21

19 Experience Experience from Production 3000 VM volumes 2.8M user uploaded files 20TB deduplicated data 80TB total data before replication 22M actual objects on the storage backend F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 19 / 21

20 The Future Upcoming Features New mapfile format More compact Allows for larger volumes with minimal metadata overhead (1PB 2GB) Garbage collection Deferred reference counting Automatic deletion of unused objects SSD Read-only caching Lower latency ISCSI target F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 20 / 21

21 Thanks Thanks Software lives at: Repository: Documentation: Mailing list: F. Giannakos, C. Nanakos Archipelago 16 th TF-Storage Meeting 21 / 21