Simplified distributed block storage with strong consistency, like in Ceph
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Documentation → Introduction → Quick Start


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Quick Start

Preparation

  • Get some SATA or NVMe SSDs with capacitors (server-grade drives). You can use desktop SSDs with lazy fsync, but prepare for inferior single-thread latency. Read more about capacitors here.
  • Get a fast network (at least 10 Gbit/s). Something like Mellanox ConnectX-4 with RoCEv2 is ideal.
  • Disable CPU powersaving: cpupower idle-set -D 0 && cpupower frequency-set -g performance.
  • Install Vitastor packages.

Configure monitors

On the monitor hosts:

  • Edit variables at the top of /usr/lib/vitastor/mon/make-units.sh to desired values.
  • Create systemd units for the monitor and etcd: /usr/lib/vitastor/mon/make-units.sh
  • Start etcd and monitors: systemctl start etcd vitastor-mon

Configure OSDs

  • Put etcd_address and osd_network into /etc/vitastor/vitastor.conf. Example:
    {
      "etcd_address": ["10.200.1.10:2379","10.200.1.11:2379","10.200.1.12:2379"],
      "osd_network": "10.200.1.0/24"
    }
    
  • Initialize OSDs:
    • Simplest, SSD-only: /usr/lib/vitastor/mon/make-osd.sh /dev/disk/by-partuuid/XXX [/dev/disk/by-partuuid/YYY ...] Warning! This very simple script by default makes units for server-grade SSDs with write-through cache! If it's not your case, you MUST remove disable_data_fsync and immediate_commit from systemd units.
    • Hybrid, HDD+SSD: /usr/lib/vitastor/mon/make-osd-hybrid.js /dev/sda /dev/sdb ... — pass all your devices (HDD and SSD) to this script — it will partition disks and initialize journals on its own. This script skips HDDs which are already partitioned so if you want to use non-empty disks for Vitastor you should first wipe them with wipefs -a. SSDs with GPT partition table are not skipped, but some free unpartitioned space must be available because the script creates new partitions for journals.
  • You can change OSD configuration in units or in vitastor.conf. Check Configuration Reference for parameter descriptions.
  • If all your drives have capacitors, create global configuration in etcd:
    etcdctl --endpoints=... put /vitastor/config/global '{"immediate_commit":"all"}'
  • Start all OSDs: systemctl start vitastor.target

Create a pool

Create pool configuration in etcd:

etcdctl --endpoints=... put /vitastor/config/pools '{"1":{"name":"testpool",
  "scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":256,"failure_domain":"host"}}'

For EC pools the configuration should look like the following:

etcdctl --endpoints=... put /vitastor/config/pools '{"2":{"name":"ecpool",
  "scheme":"ec","pg_size":4,"parity_chunks":2,"pg_minsize":2,"pg_count":256,"failure_domain":"host"}`

After you do this, one of the monitors will configure PGs and OSDs will start them.

Check cluster status

vitastor-cli status

Or you can check PG states with etcdctl --endpoints=... get --prefix /vitastor/pg/state. All PGs should become 'active'.

Create an image

Use vitastor-cli (read CLI documentation here):

vitastor-cli create -s 10G testimg

After that, you can run benchmarks or start QEMU manually with this image.

Install plugins