This release includes a bunch of important bugfixes for erasure-coded setups with disabled immediate_commit. After these fixes, "test_heal" OSD killing test now passes fine with EC: - Fix cluster write stalls with "Error while doing flush on OSD xx: -16 (Device or resource busy)" in OSD logs possible in EC setups with disabled immediate_commit by selectively syncing nonsynced objects on STABILIZE/ROLLBACK (https://github.com/vitalif/vitastor/issues/51) - Fix other EC + disabled immediate_commit problems: - Fix "opcode=5 retval=-2" errors happening on SYNC retries - Fix non-working "pagination" during PG dirty object flushing - Fix write operations not continued correctly after dirty object flushing - Fix incorrect parity read-modify-write calculation when writing into a lost chunk - Fix OSDs losing left_on_dead PG state of non-clean PGs and thus not removing junk data in the cluster - Fix a small memory leak caused by bad indexing of EC recovery matrices - Fix a rare use-after-free in cluster_client caused by a reenterability issue - Fix vitastor-cli create command syntax in the CSI driver - Allow to start OSDs without local store for tests - Fix memory allocation error in disk_tool_meta for non-standard metadata block sizes - Fix delete operations received before loading pool metadata crashing OSDs with "null pointer exception" - Improve "theoretical performance" Russian documentation New features: - Implement online configuration update for some parameters. Documentation is coming soon :)
Make Clustered Block Storage Fast Again.
Vitastor is a distributed block SDS, direct replacement of Ceph RBD and internal SDS's of public clouds. However, in contrast to them, Vitastor is fast and simple at the same time. The only thing is it's slightly young :-).
Vitastor is architecturally similar to Ceph which means strong consistency, primary-replication, symmetric clustering and automatic data distribution over any number of drives of any size with configurable redundancy (replication or erasure codes/XOR).
Vitastor targets SSD and SSD+HDD clusters with at least 10 Gbit/s network, supports TCP and RDMA and may achieve 4 KB read and write latency as low as ~0.1 ms with proper hardware which is ~10 times faster than other popular SDS's like Ceph or internal systems of public clouds.
Vitastor supports QEMU, NBD, NFS protocols, OpenStack, Proxmox, Kubernetes drivers. More drivers may be created easily.
Read more details below in the documentation.
Talks and presentations
- DevOpsConf'2021: presentation (in Russian, in English), video
- Highload'2022: presentation (in Russian), video
Author and License
Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+
Join Vitastor Telegram Chat: https://t.me/vitastor
All server-side code (OSD, Monitor and so on) is licensed under the terms of Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on GNU GPLv3.0 with the additional "Network Interaction" clause which requires opensourcing all programs directly or indirectly interacting with Vitastor through a computer network and expressly designed to be used in conjunction with it ("Proxy Programs"). Proxy Programs may be made public not only under the terms of the same license, but also under the terms of any GPL-Compatible Free Software License, as listed by the Free Software Foundation. This is a stricter copyleft license than the Affero GPL.
Please note that VNPL doesn't require you to open the code of proprietary software running inside a VM if it's not specially designed to be used with Vitastor.
Basically, you can't use the software in a proprietary environment to provide its functionality to users without opensourcing all intermediary components standing between the user and Vitastor or purchasing a commercial license from the author 😀.
Client libraries (cluster_client and so on) are dual-licensed under the same VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed software like QEMU and fio.