Jason Dillaman RBD Project Technical Lead Vault Disaster Recovery and Ceph Block Storage Introducing Multi-Site Mirroring
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1 Jason Dillaman RBD Project Technical Lead Vault 2017 Disaster Recovery and Ceph Block Storage Introducing ulti-site irroring
2 WHAT IS CEPH ALL ABOUT Software-defined distributed storage All components scale horizontally No single point of failure Self-manage whenever possible Hardware agnostic, commodity hardware Object, block, and file in a single cluster Open source (LGPL)
3 CEPH COPONENTS OBJECT BLOCK FILE RGW A web services gateway for object storage, compatible with S3 and Swift RBD A reliable, fully-distributed block device with cloud platform integration CEPHFS A distributed file system with POSIX semantics and scale-out metadata management LIBRADOS A library allowing apps to directly access RADOS (C, C++, Java, Python, Ruby, PHP) RADOS A software-based, reliable, autonomous, distributed object store comprised of self-healing, self-managing, intelligent storage nodes and lightweight monitors
4 RADOS BLOCK DEVICE Block device abstraction Striped over fixed-size objects Highlights Broad integration Thinly provisioned Snapshots Copy-on-write clones
5 RADOS BLOCK DEVICE User-space Client LIBRBD LIBRADOS Linux Host KRBD LIBCEPH IAGE UPDATES RADOS CLUSTER
6 IRRORING OTIVATION assively scalable and fault tolerant design What about data center failures? Data is the special sauce Failure to plan is planning to fail Snapshot-based incremental backups Desire online, continuous backups a la RBD irroring
7 IRRORING DESIGN PRINCIPLES Replication needs to be asynchronous IO shouldn t be blocked due to slow WAN Support transient connectivity issues Replication needs to be crash consistent Respect write barriers Easy management Expect failure can happen anytime
8 IRRORING DESIGN FOUNDATION Journal-based approach to log all modifications Support access by multiple clients Client-side operation Event logs appended into journal objects Delay all image modifications until event safe Commit journal events once image modification safe Provides an ordered view of all updates to an image
9 JOURNAL DESIGN Typical IO path with journaling: a. Create an event to describe the update b. Asynchronously append event to journal object c. Update in-memory image cache d. Blocks cache writeback for affected extent e. Completes IO to client f. Unblock writeback once event is safe
10 JOURNAL DESIGN IO path with journaling w/o cache: a. Create an event to describe the update b. Asynchronously append event to journal object c. Asynchronously update image once event is safe d. Complete IO to client once update is safe 0
11 JOURNAL DESIGN WRITES READS User-space Client LIBRBD IAGE UPDATES LIBRADOS JOURNAL EVENTS 1 RADOS CLUSTER
12 IRRORING OVERVIEW irroring peers are configured per-pool Enabling mirroring is a per-image property Requires that the journal image feature is enabled Image is primary (R/W) or non-primary (R/O) Replication is handled by rbd-mirror daemon 2
13 RBD-IRROR DAEON Requires access to remote and local clusters Responsible for image (re)sync Replays journal to achieve consistency Pulls journal event from remote cluster Applies event to local cluster Commits journal event Trim journal Transparently handles failover/failback Two-way replication between two sites One-way replication between N sites 3
14 RBD-IRROR DAEON SITE A SITE B Client LIBRBD RBD-IRROR LIBRBD IAGE UPDATES IAGE UPDATES JOURNAL EVENTS CLUSTER A CLUSTER B 4
15 IRRORING SETUP Deploy rbd-mirror daemon on each cluster Jewel/Kraken only support single active daemon per-cluster Provide uniquely named ceph.conf for each remote cluster Create pools with same name on each cluster Enable pool mirroring (rbd mirror pool enable) Specify peer cluster via rbd CLI (rbd mirror pool peer add) Enable image journaling feature (rbd feature enable journaling) Enable image mirroring (rbd mirror image enable) 5
16 SITE FAILOVER Per-image failover / failback Coordinated demotion / promotion (rbd mirror image demote) (rbd mirror image promote) Uncoordinated promotion + resync (rbd mirror image promote --force) Resync from force-promotion / split-brain (rbd mirror image resync) 6
17 CAVEATS Write IOs have worst-case 2x performance hit Journal event append Image object write In-memory cache can mask hit if working set fits Only supported by librbd-based clients 7
18 ITIGATION Use a small SSD/NVe-backed pool for journals rbd journal pool = <fast pool name> Batch multiple events into a single journal append rbd journal object flush age = <seconds> Increase journal data width to match queue depth rbd journal splay width = <number of objects> Future work: potentially parallelize journal append + image write between write barriers 8
19 FUTURE FEATURES Active/Active rbd-mirror daemons Deferred replication and deletion Deep Scrub of replicated images Smarter image resynchronization Improved health status reporting Improved pool promotion process 9
20 BE PREPARED Design for failure Ceph now provides additional tools for full-scale disaster recovery RBD workloads can seamlessly relocate between geographic sites Feedback is welcome 0
21 21 Questions?
22 THANK YOU! Jason Dillaman RBD Project Tech Lead 22
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