Appreciate the detailed reply Christian. On Sun, 28 Dec 2014 02:49:08 PM Christian Balzer wrote: > On Sun, 28 Dec 2014 08:59:33 +1000 Lindsay Mathieson wrote: > > I'm looking to improve the raw performance on my small setup (2 Compute > > Nodes, 2 OSD's). Only used for hosting KVM images. > > This doesn't really make things clear, do you mean 2 STORAGE nodes with 2 > OSDs (HDDs) each? 2 Nodes, 1 OSD per node Hardware is indentical for all nodes & disks - Mobo: P9X79 WS - CPU:Intel Xeon E5-2620 - RAM: 32 GB ECC - 1GB Nic Public Access - 2 * 1GB Bond for ceph - OSD: 3TB WD Red - Journal: 10GB on Samsung 840 EVO 3rd Node - Monitor only, for quorum - Intel Nuc - 8GB RAM - CPU: Celeron N2820 > In either case that's a very small setup (and with a replication of 2 a > risky one, too), so don't expect great performance. Ok. > > Throughput numbers aren't exactly worthless, but you will find IOPS to be > the killer in most cases. Also without describing how you measured these > numbers (rados bench, fio, bonnie, on the host, inside a VM) they become > even more muddled. - rados bench on the node to test raw write - fio in a VM - Crystal DiskMark in a windows VM to test IOPS > You really, really want size 3 and a third node for both performance > (reads) and redundancy. I can probably scare up a desktop PC to use as a fourth node with another 3TB disk. I'd prefer to use the existing third node (the Intel Nuc), but its expansion is limited to USB3 devices. Are there USB3 external drives with decent performance stats? thanks, -- Lindsay
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