-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 In our tests we got better performance with OSD journals on SSD than with bcache. We abandoned the complexity of bcache. YMMV. -----BEGIN PGP SIGNATURE----- Version: Mailvelope v0.13.1 Comment: https://www.mailvelope.com wsFcBAEBCAAQBQJVcNSNCRDmVDuy+mK58QAA6vYP/jAgsNgACCK+RrUD6BUW 2lmWJ4ncGWy3IdvHY8zl6ZgnaBLoRzbb+UNrYYLmkqIQRRDtoTbhihZsgxCs FWVLcI/ka44UJXlWmnJdavRM1RdANGI40dvpzJPOZJ6cmVXKHoczAypHmNr+ tcn9vIIsbhTCtykIEK9waaR9VX17TPShYewl8pf20eknBB2eq7JQuTWba6qT /P087wtBr/SnRqSXebdw92NB/JG74xc/YGgh+OCs7aK86wwoWsWAyQw376h4 oWNQ5Kp0LNxDNB68iNE5JJhSvxqr/8bDNXQ96fIiZWk3fcr6p87QWrRjSB0r 2FxW3lWCVk+p+3MXOxnAKUyZUq+i/lgkTKbiTnbLaL6ziIyf5egmNqKgReiE L+1PL0WPwKywFQ4RbN04BdgdL+DytUNpULbrTje7QGZaaQjUBEjcXb9dHFk9 zE0e1s9d/45jA2m3lCC3xJ9jvBVDEgOKrdEH+pAL1kpjfPtpQH70y+F4ZKBw JSZeFtdiPkLVz3hNONseapV+F5n+QMM5wMvbfrYO/h7OG8+ZPrWfv6a3YAIS i1L0kfNU7eCI4GBdjYkyGINZno1DYG3VrS1u04UIzbp6vS8J6TkZoouh2Vv0 Gp6YzCerc4QjkM4N/4Huy+HhgSjG3aNt5VHGp9/xMGqT6ihzsAHOcPcnx+zp BLT4 =cnp+ -----END PGP SIGNATURE----- ---------------- Robert LeBlanc GPG Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 On Thu, Jun 4, 2015 at 12:23 PM, Lars Marowsky-Bree <lmb@xxxxxxxx> wrote: > On 2015-06-04T12:42:42, David Burley <david@xxxxxxxxxxxxxxxxx> wrote: > >> Are there any safety/consistency or other reasons we wouldn't want to try >> using an external XFS log device for our OSDs? I realize if that device >> fails the filesystem is pretty much lost, but beyond that? > > I think with the XFS journal on the same SSD as ceph's OSD journal, that > could be a quite interesting setup. Please share performance numbers! > > I've been meaning to benchmark bcache in front of the OSD backend, > especially for SMRs, but haven't gotten around to it yet. > > > Regards, > Lars > > -- > Architect Storage/HA > SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Dilip Upmanyu, Graham Norton, HRB 21284 (AG Nürnberg) > "Experience is the name everyone gives to their mistakes." -- Oscar Wilde > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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