-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 What is the difference between straw and straw2 buckets? Should we consider "upgrading" to straw2 buckets by dumping the CRUSH map and updating them? -----BEGIN PGP SIGNATURE----- Version: Mailvelope v0.13.1 Comment: https://www.mailvelope.com wsFcBAEBCAAQBQJVUl+WCRDmVDuy+mK58QAACGwP/1QE36r32daNnbxYI5Bu 9v1pVWjytg8msjOPXLCDNelXzu1CUudn11Y6CPTujUm+q8lsQOliYlpJgsRU sjCxzaEkmochM3jcJ6EVbHnFBJpwD33fSst0r6VFqd6wK0Bay/mN4D/yjkd8 boHA0NrXU7uCy4lCEflVw/zSArcsSvb7MDeVmvJDnwlN3lkUUcZjZpIgmf04 1dc7VCevFvC7idR6yyYWQ9zeWp1FMSjlE9nnt6KXN4tDOZJBcvpf4aUEbCq0 gp0GHbc3cLKiJgiFZbOV8ZTfjCpaEcT2NNVkMKxXvDE/g2p1plfuHu7Xdtm6 jAc92BpE8pZSLqRvGEY9+OhkNeSMYmMS3NXTO/96u+X4EV2y7qyTTZwHAfFt dyohJx0S4ssUw2lALHzuFvOqQSccJiiNAlb5ChKslnM7lKVqv/EjpDsoLpO1 jd62GxaW0SymbYT00bVBu9LXR20yczZ4hqlsJH7igYdzKlvMfM0sR/rUqSxa yPu68sPSDzZ5LuvgWcR+WoMV+yWjykKqZUCBdkMNu4ZC6M8tVFynbqyqxMof RqsFbVRm+6quen5UiWTJoZvxVJjT5iSmd52RZ06n3e7II5VQwpFgr2qDzW+A spN8nLBzJFKnUbNMqPXvutaf/458yW2bE3ARgs5g+DQjeKy1Nj7Cu5n5H135 Y0ry =xvWE -----END PGP SIGNATURE-----
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Robert LeBlanc
GPG Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
On Tue, May 12, 2015 at 2:12 PM, Ilya Dryomov <idryomov@xxxxxxxxx> wrote:
On Tue, May 12, 2015 at 10:38 PM, Chad William Seys
<cwseys@xxxxxxxxxxxxxxxx> wrote:
> Hi Ilya and all,
> Thanks for explaining.
> I'm confused about what "building" a crushmap means.
> After running
> #ceph osd crush tunables hammer
> data migrated around the cluster, so something changed.
> I was expecting that 'straw' would be replaced by 'straw2'.
> (Unfortunately I did not dump the crushmap prior to setting tunables to
> hammer, so I don't know what change did occur.)
> So I guess setting tunables to hammer is not "building" a crushmap.
> Could you give examples? Would creating a new pool on the cluster now use
> straw2?
No, pools use crush rulesets. "straw" and "straw2" are bucket types
(or algorithms).
As an example, if you do "ceph osd crush add-bucket foo rack" on
a cluster with firefly tunables, you will get a new straw bucket. The
same after doing "ceph osd crush tunables hammer" will get you a new
straw2 bucket, with the rest of your buckets remaining unaffected.
straw buckets are not going to be replaced with straw2 buckets, that's
something you as an administrator can make a choice to do.
Thanks,
Ilya
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