-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On Wed, Feb 3, 2016 at 9:00 PM, Christian Balzer wrote: > On Wed, 3 Feb 2016 16:57:09 -0700 Robert LeBlanc wrote: > That's an interesting strategy, I suppose you haven't run into the issue I > wrote about 2 days ago when switching to forward while running rdb bench? We haven't, but we are running 0.94.5. If you are running Firefly, that could be why. > In my case I venture that the number of really hot objects is small enough > to not overwhelm things and that 5K IOPS would be all that cluster ever > needs to provide. We have 48x Micron M600 1TB drives. They do not perform as well as the Intel S3610 800GB which seems to have the right balance of performance and durability for our needs. Since we had to under provision the M600s, we should be able to get by with the 800GB just fine. Once we get the drives swapped out, we may do better than the 10K IOPs as well as the recency fix going into the next version of Hammer it will help with writeback. With our new cluster, we did fine in writeback mode until we hit that 10K IOP limit, then we started getting slow I/O messages, turning it to forward mode and things sped up a lot. - ---------------- Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 -----BEGIN PGP SIGNATURE----- Version: Mailvelope v1.3.4 Comment: https://www.mailvelope.com wsFcBAEBCAAQBQJWsuTFCRDmVDuy+mK58QAAxO0P/R2mkmoOE/YSD9Ea8uUz XBlOI2eibT5DGK6jR/hVL0V0dInNtVM+4yGWEmvJm5nxnwbx+EQd+lCTFQ5y WouwGQLCMOCiy0rgduTeTwyGHjeIbloGoYYhZQPEFHOMt1lcKcwiEbrEKUYN csUmEApK2aiPna5dMsvQs39/oATuid9Aec8VwcyCozzWUe/UziXVFhdWw3Q5 2mz8AuOhrmFqd7iyFN9Dici/DXLhBxWgg4PWn81Ggzq/5LHGyyV6A0jiLCBH /B9rUCOmdfBvdK/GxCG7iUqIjVvIR2mtYFkCu7VL/exsnxuGRB2RHYcXgfVH rMbZ+gbK/T4XZvUTwDpsfzkEwOTlCuhkcMcHyZLl/MdmcNVXP2+cB9TaCbPI Hn2H0CuXqQhZ73znQSVS66/QA7s4W5LzMiAUZnOdIX05eVLnZEgstFr8fSEn O95Y4jLYyQB+CIF9IfA6fgGsvnrs0rTGvYEThk6HL1sa6uVwR5PESVJpapS5 smUenHyp7OPTVdVpGzJh6VOOB08lcA7JFkicCSG1iXTPucuGkuVNMQ2i0LNb DA/WAbwUqSK1XHIIu2NCaDZsIbSPwWGXj2uwfNFgSzss1UqAVEF0cBfY6c6n 3bdPwY2SgOc7nB+LGDQM6dsaFqDS1E490cFwc85uDTkVOBL0JcAJHAvZV2lD w4Tj =H+mV -----END PGP SIGNATURE----- _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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