On Fri, Jan 21, 2022 at 10:45 AM Gilboa Davara <[email protected]> wrote:
> On Thu, Jan 20, 2022 at 8:52 AM <[email protected]> wrote: > >> Hi all, >> >> Feel free to give your personal opinion whether software RAID makes any >> sense at all with oVirt Node or what your architecture would be given the >> mentioned hardware (3 servers, 6 800GB NVME disks, 18 7.68TB NVME disks). >> >> Thanks a lot for any feedback, >> Jonas >> > > Hello, > > I somehow missed your original email. > While I don't have a comparable setup (We usually opt for mixed SSD HDD > setups with fast VMs running on SSD bached gluster volumes and > large-storage VMs using HDD backed gluster volume), I can offer some > insight. > 1. Performance wise, using software RAID10 on the NVME drives will give > you great performance, while reducing the chance of a double drop. > 2. Avoid using RAID5/50/6/60 as the write amplification will eat up your > read-intensive NVMEs life span in a couple of months. > 3, Use a fast network back-end. A good high-end server with hardware RAID > HDD can easily saturate a 10GbR Linux @peak load. > 4. Use arbiter volumes, split the load between the nodes to reduce the > write amplifications. (N1: brick, brick, arbiter. N2: brick, arbiter, > brick. N3: arbiter, brick, brick). > 5. In general I usually avoid using the wizard, manually creating the > gluster volumes before I begin the deployment. > > - Gilboa > I missed the fact that your 3'rd host has considerably smaller storage. In this case, luckily I have a comparable setup @Home. I simply placed all the arbiter volumes on the 3'rd host. - Gilboa
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