You are browsing a read-only backup copy of Wikitech. The live site can be found at wikitech.wikimedia.org
Portal:Cloud VPS/Admin/VM flavors
Each VM created with Openstack Nova is assigned a flavor. Flavor determines the following characteristics for a VM:
- Number of vcpus
- Available RAM
- Available disk space for local storage
- Storage backend (ceph or non-ceph)
- Disk access rate limits
- Scheduling hints that associated flavors with particular host aggregates
A flavor can be private or public. Public flavors are available for use by all projects; private flavors are assigned for limited use by one or more specified project. A private flavor cannot be made public, nor a public flavor made private.
General flavor guidelines
Flavor names begin with a generation count (e.g. 'g2' for 2nd generation flavors), followed by cores, ram, disk space. For example, a second generation flavor with 2 cores, 8 gigs of ram and 20Gb of disk space would be
Each flavor must specify a scheduling pool (via
aggregate_instance_extra_specs). An icinga alert will fire if a flavor is found without
Each ceph-enabled flavor must specify disk access rate limits. An icinga alert will fire if a flavor is found WITH
aggregate_instance_extra_specs:ceph='true' but WITHOUT
No public flavor should be created with any quota above the following: 8 cores, 16G RAM, 160G disk. Users may request instances with larger specs, but these should be private flavors, created on an as-needed basis and associated only with specific, approved projects.
2nd generation flavors
Generation 2 flavors were created in September of 2020 to support the move to Ceph. Each g2 flavor is presumed to schedule in the standard Ceph pool 'eqiad1-compute'.
Flavors that do NOT use Ceph should be tagged with '.local-storage.' For example, a Generation 2 flavor used for a database host might be named g2.cores16.ram64.disk3000.local-storage. Local storage flavors should be quite unusual, and typically reserved for WMCS staff use and/or custom hardware.
Some example of g2 flavors are:
g2.cores8.ram18.disk160 g2.cores4.ram8.disk80 g2.cores2.ram4.disk40 g2.cores1.ram2.disk20
1st generation flavors
Generation 1 flavors are legacy flavors that predate any attempt at standardization. Some use amazon-style 'm1' naming, some have usage-specific names. In addition, many have non-standard single-digit internal IDs rather than standard uuids.
Most of these flavors will be removed as soon as possible. Here is the complete list of 1st generation flavors as of September, 2020:
2: m1.small 3: m1.medium 4: m1.large 5: m1.xlarge 7: m1.gigantic 21e9047d-a60f-499d-b7f5-51f83ddf3611: bigdisk2 c39bc0a6-71a2-4512-926e-43cccf5f8b4c: mediumdb e48a8d9d-e735-4742-981f-b55f293d4115: bigram e7261773-a931-4a72-b725-3ccf71580b18: largedb 72116845-7941-4d3d-9eb1-11084b7b1927: cloudvirt-canary bd542f73-4fdb-4aa0-98dd-049406152392: cloudvirt-canary-ceph 62a89635-8a60-40d7-9b58-56594a071b0a: justdisk 2d59cc0d-538c-4bbd-b975-8e696a4f7207: c1.m2.s80 8af1f1cc-d95f-4380-bf10-bcfa0321b10f: c8.m8.s60 4cf440b0-b4c7-42b5-a18e-7746b50390fc: dumps-temporary-file-storage 101: ci1.medium 3a6d6aa8-05de-4811-b882-72595a4d6529: mediumram-ceph 7b92dec5-e831-4eef-abc8-1ed585c59c66: mediumram cc0f1723-38d7-42da-aa2c-cef28d5f4250: xlarge-xtradisk 857921a5-f0af-4069-8ad1-8f5ea86c8ba2: m1.small-ceph 6606e793-2949-4beb-9051-50341fcafbf7: m1.xlarge-ceph e4c6fb0b-0cf7-4f50-9f1f-db3eea00fb2c: m1.large-ceph 7b7df879-9750-4516-8e84-1de9896963f0: transferpy-test 65de37ea-f087-48d7-9769-0cd741a7219b: wdqs.full f34a542a-a933-4341-8f43-ff8442f48a01: t206636 15675a68-8f3d-450b-af4b-d661a486c926: parsingtest