Distributed Object Storage System Ceph in Practice
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1 Distributed Object Storage System Ceph in Practice Dominik Joe Pantůček Trustica Dominik Joe Pantůček Trustica Practical Ceph / 32
2 Legal notice. Dominik Joe Pantůček Trustica Practical Ceph / 32
3 Distributed Object Storage System Ceph in Practice Dominik Joe Pantůček Trustica Dominik Joe Pantůček Trustica Practical Ceph / 32
4 Why? Why daily operations? We need convenient deployment of VMs: private IaaS cloud. Why cloud? It s convenient. Why private cloud? Negotiations with cloud service providers are tough. Why Ceph? Everything else failed miserably. Dominik Joe Pantůček Trustica Practical Ceph / 32
5 What is Ceph? Distributed, highly scalable, open source, object storage... block storage, file system and other applications. A parallel universe, where, thanks to masterfully written Ceph, peace and prosperity prevail. Dominik Joe Pantůček Trustica Practical Ceph / 32
6 Ceph Architecture Daemons: OSD - Object Data storage Monitor Metadata Server MDS Nodes: OSD, Monitor, MDS, client, admin. Dominik Joe Pantůček Trustica Practical Ceph / 32
7 Ceph OSD Object Storage Device Disk or at least part of it. The Ceph OSD daemon. Multiple OSDs in one physical node, managed in pools by monitors. Dominik Joe Pantůček Trustica Practical Ceph / 32
8 Ceph Monitor Cluster state cluster map, consisting of maps: monitor map, OSD map, placement group map, CRUSH map, MDS map. Only 1 monitor and 2 OSDs are needed for bare minimum cluster. Dominik Joe Pantůček Trustica Practical Ceph / 32
9 Ceph (OSD) Hierarchy Cluster: Node OSD Monitor MDS Client Dominik Joe Pantůček Trustica Practical Ceph / 32
10 Objects placement No files or directories. Object storage stores only objects. Behaves like key:value store. The value can be really big. Find balance: across all OSDs and across nodes. Dominik Joe Pantůček Trustica Practical Ceph / 32
11 Placement groups Set of OSDs within a pool which can store an object. Size based upon pool number of replicas. Vast number of objects compared to number of PGs. Dominik Joe Pantůček Trustica Practical Ceph / 32
12 CRUSH Controlled Replication Under Scalable Hashing. Each client computes which PGs to use. Describes cluster hierarchy as a weighted tree. Selects sets of disks based on deterministic criteria. Does not need any central authority. Dominik Joe Pantůček Trustica Practical Ceph / 32
13 RADOS Set of protocols governing CRUSH, RBD and metadata. Reliable Autonomic Distributed Object Store. Dominik Joe Pantůček Trustica Practical Ceph / 32
14 Monitors Cluster management, voting, osd handling, yes, everything. Dominik Joe Pantůček Trustica Practical Ceph / 32
15 Ceph File System Built on top of the underlying objects, POSIX file system with advanced features, directory size is reported immediately, virtually no limits on file sizes, data/metadata separate redundancy settings: different pools. Dominik Joe Pantůček Trustica Practical Ceph / 32
16 Metadata Server Separate pool for metadata, MDS serves objects metadata, reasonable performance, required for the actual FS implementation. Dominik Joe Pantůček Trustica Practical Ceph / 32
17 In the cloud Amazon Simple Storage Service (S3)? Openstack? Swift. Ceph backend. Dominik Joe Pantůček Trustica Practical Ceph / 32
18 RBD for disks Block device, from multiple objects, naming conventions prefix, provides caching, true concurrent access. Dominik Joe Pantůček Trustica Practical Ceph / 32
19 Ceph FS for shared data ISO images, configurations, shared data. Dominik Joe Pantůček Trustica Practical Ceph / 32
20 Ceph FS release Stable in 10 series, available as FUSE. Dominik Joe Pantůček Trustica Practical Ceph / 32
21 Kernel support Both Ceph RBD and File Systems Support merged into (released May 16, 2010) Convenient usage Ceph FS: mount -t ceph mon1,mon2,mon3:/ /mnt/ceph RBD: rbd map mypool/mydevice mkfs -t ext4 /dev/rbd1 Dominik Joe Pantůček Trustica Practical Ceph / 32
22 But... Dominik Joe Pantůček Trustica Practical Ceph / 32
23 RBD thin provisioning Provision 20PB, wait 8 days before de-provisioning finishes... profit??? Dominik Joe Pantůček Trustica Practical Ceph / 32
24 RBD locking $ rbd map On two nodes, on one mkfs on other mount, everything works, another time on single node... D indefinitely. $ reboot Dominik Joe Pantůček Trustica Practical Ceph / 32
25 Ceph-FS locking Processes in D state any time, no way to unmount, $ reboot Dominik Joe Pantůček Trustica Practical Ceph / 32
26 Log clogging libceph... Does not prevent the locking bugs. Does not even log them... $ reboot Dominik Joe Pantůček Trustica Practical Ceph / 32
27 Userspace RBD RBD as storage backend for VM in KVM librbd in userspace (qemu-kvm) Dominik Joe Pantůček Trustica Practical Ceph / 32
28 Userspace Ceph filesystem In 10.x ceph-fuse implementation. Stable. Decent performance. Dominik Joe Pantůček Trustica Practical Ceph / 32
29 RBD cache Performance is an issue, commits are a problem, always use backup battery for the controllers. Dominik Joe Pantůček Trustica Practical Ceph / 32
30 References Ceph, Bugemos Jojin&HedgeHog: The Chronicles of KOS - Alternativní přítomnost, 2006, available online at CRUSH: Controlled, Scalable, Decentralized Placement of Replicated Data, Sage A. Weil, Scott A. Brandt, Ethan L. Miller and Carlos Maltzahn, Storage Systems Research Center University of California, Santa Cruz, SC2006 November 2006, Tampa, Florida, USA /06, available online at Dominik Joe Pantůček Trustica Practical Ceph / 32
31 Questions... and answers. Dominik Joe Pantůček Trustica Practical Ceph / 32
32 Thank you! Dominik Joe Pantůček Trustica Practical Ceph / 32
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