{"id":18577003,"url":"https://github.com/dm-vdo/vdo","last_synced_at":"2025-04-04T07:06:19.730Z","repository":{"id":26300126,"uuid":"107873210","full_name":"dm-vdo/vdo","owner":"dm-vdo","description":"Userspace tools for managing VDO volumes.","archived":false,"fork":false,"pushed_at":"2025-03-14T22:29:48.000Z","size":5928,"stargazers_count":196,"open_issues_count":10,"forks_count":32,"subscribers_count":31,"default_branch":"master","last_synced_at":"2025-03-28T06:07:00.498Z","etag":null,"topics":["compression","deduplication","storage","vdo"],"latest_commit_sha":null,"homepage":null,"language":"C","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"gpl-2.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/dm-vdo.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"COPYING","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2017-10-22T14:28:39.000Z","updated_at":"2025-03-14T22:28:19.000Z","dependencies_parsed_at":"2024-05-01T04:28:53.090Z","dependency_job_id":"5c3c8a03-5176-4ed6-8052-4ae6dd89e77c","html_url":"https://github.com/dm-vdo/vdo","commit_stats":{"total_commits":42,"total_committers":5,"mean_commits":8.4,"dds":"0.16666666666666663","last_synced_commit":"64786b761f936e65d22bf2f6fda8642d5cc8964e"},"previous_names":[],"tags_count":67,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/dm-vdo%2Fvdo","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/dm-vdo%2Fvdo/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/dm-vdo%2Fvdo/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/dm-vdo%2Fvdo/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/dm-vdo","download_url":"https://codeload.github.com/dm-vdo/vdo/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":247135143,"owners_count":20889420,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["compression","deduplication","storage","vdo"],"created_at":"2024-11-06T23:27:27.223Z","updated_at":"2025-04-04T07:06:19.710Z","avatar_url":"https://github.com/dm-vdo.png","language":"C","funding_links":[],"categories":[],"sub_categories":[],"readme":"# vdo\n\nA set of userspace tools for managing pools of deduplicated and/or compressed\nblock storage.\n\n## Background\n\nVDO is a device-mapper target that provides inline block-level deduplication,\ncompression, and thin provisioning capabilities for primary storage. VDO\nis managed through LVM and can be integrated into any existing storage stack.\n\nDeduplication is a technique for reducing the consumption of storage resources\nby eliminating multiple copies of duplicate blocks. Compression takes the\nindividual unique blocks and shrinks them with coding algorithms; these reduced\nblocks are then efficiently packed together into physical blocks. Thin\nprovisioning manages the mapping from logical block addresses presented by VDO\nto where the data has actually been stored, and also eliminates any blocks of\nall zeroes.\n\nWith deduplication, instead of writing the same data more than once each\nduplicate block is detected and recorded as a reference to the original\nblock. VDO maintains a mapping from logical block addresses (presented to the\nstorage layer above VDO) to physical block addresses on the storage layer\nunder VDO. After deduplication, multiple logical block addresses may be mapped\nto the same physical block address; these are called shared blocks and are\nreference-counted by the software.\n\nWith VDO's compression, blocks are compressed with the fast LZ4 algorithm, and\ncollected together where possible so that multiple compressed blocks fit within\na single 4 KB block on the underlying storage. Each logical block address is\nmapped to a physical block address and an index within it for the desired\ncompressed data. All compressed blocks are individually reference-counted for\ncorrectness.\n\nBlock sharing and block compression are invisible to applications using the\nstorage, which read and write blocks as they would if VDO were not present.\nWhen a shared block is overwritten, a new physical block is allocated for\nstoring the new block data to ensure that other logical block addresses that\nare mapped to the shared physical block are not modified.\n\nThis repository contains a set of userspace tools for managing VDO volumes.\nThese include \"vdoformat\" for creating new volumes, \"vdostats\" for extracting\nstatistics from those volumes, and a variety of support and debugging tools\nwhich should not be necessary during ordinary operation.\n\n## History\n\nVDO was originally developed by Permabit Technology Corp. as a proprietary set\nof kernel modules and userspace tools. This software and technology has been\nacquired by Red Hat and relicensed under the GPL (v2 or later). The kernel\nmodule has been merged into the upstream Linux kernel as dm-vdo.\n\n## Documentation\n\n- [RHEL9 VDO Documentation](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/deduplicating_and_compressing_logical_volumes_on_rhel/index)\n- [RHEL8 VDO Documentation](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/deduplicating_and_compressing_storage/index)\n- [RHEL7 VDO Integration Guide](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/vdo-integration)\n- [RHEL7 VDO Evaluation Guide](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/vdo-evaluation)\n\n## Releases\n\nThe master branch of this repository is intended to be compatible with the most\nrecent version of the Linux kernel. These packages are available in active\nFedora releases with matching kernel versions.\n\nVersion | Oldest Supported Linux Kernel Version \n------- | --------------------------------------\n8.3.x.x | 6.9.0\n\nEach older branch of this repository is intended to work with a specific\nrelease of Enterprise Linux (Red Hat Enterprise Linux, CentOS, etc.).\n\nVersion | Intended Enterprise Linux Release\n------- | ---------------------------------\n6.1.x.x | EL7 (3.10.0-*.el7)\n6.2.x.x | EL8 (4.18.0-*.el8)\n8.2.x.x | EL9 (5.14.0-*.el9)\n\n* Pre-built versions with the required modifications for older Fedora releases\n  can be found [here](https://copr.fedorainfracloud.org/coprs/rhawalsh/dm-vdo)\n  and can be used by running `dnf copr enable rhawalsh/dm-vdo`.\n\n## Building\n\nIn order to build the user-level programs, invoke the following command\nfrom the top directory of this tree:\n\n        make\n\nAfter building the user-level programs, they may be installed in the\nstandard locations by invoking the following command from the top directory\nof this tree, as the root user:\n\n        make install\n\n## Communication Channels and Contributions\n\nCommunity feedback, participation and patches are welcome to the\n[vdo-devel](https://github.com/dm-vdo/vdo-devel) repository, which is the\nparent of this one. This repository does not accept pull requests.\n\n## Licensing\n\n[GPL v2.0 or later](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html).\nAll contributions retain ownership by their original author, but must also be\nlicensed under the GPL 2.0 or later to be merged.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdm-vdo%2Fvdo","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdm-vdo%2Fvdo","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdm-vdo%2Fvdo/lists"}