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For example? How to use standard nvme or ssd for persistent cache?

I answer my own question. I have nvme which I wanted to cache - doesn't support DAX.

I would like to try using ssd as rbd persistent cache CEPH device. But it didn't work for me because I can't specify the DAX mount option. Is this functionality missing in PVE or am I doing something wrong?

I understand. Thanks for the tip. I just don’t understand the usage scenario itself yet) I watched the video, read HELP - the essence is not entirely clear.

Greetings. Can I completely disable SDN in a Proxmox VE 8 cluster. I don't plan to use it. If there is no way to remove it, how can I hide the SDN settings from the interface?

ceph version 17.2.6 (995dec2cdae920da21db2d455e55efbc339bde24) quincy (stable) I tested cluster performance with wal/db hosted on nvme and cleared osd several times. The last time I added them, the counters did not appear. + I rolled back to the configuration version "0" with the ceph config...

I have been configuring and testing ceph. When OSDs were first added, the performance values of the added osds were automatically added to the configuration database. However, at some point it stopped working. Should it work? Maybe some update came that turned off this functionality? Running...

Can you clarify how the process of writing and reading on the OSD. From the official documentation, you can see the logic that exactly 1 OSD is used and not a group of OSD disks. That is, in fact, it writes to a specific OSD and then replicates to another OSD 2 nodes and also replicates to OSD 3...

No. I forced the nvme class

ip link set bond0 mtu 9000 Command solves the problem by increasing the MTU. But as far as I know this is not a solution. :eek:

The scenario is quite simple - using your internal services with fault tolerance. Still, I don't understand one thing. When I used nvme to run a data pool on it, the network exchange rate also did not exceed 1.5 Gbit/s as well as with conventional HDDs. Why?

A situation has arisen. Set to MTU 9000 via the web interface. Used by OVS. After restarting the server, the MTU on some interfaces drops to 1500 - bond and ovs-system. How can I fix this? proxmox-ve: 7.4-1 (running kernel: 5.15.107-2-pve) pve-manager: 7.4-3 (running version: 7.4-3/9002ab8a)...

My question was, however, whether the results I had provided were adequate. However, below are the full test results inside the virtual machine with various combinations. Test results of Proxmox VM configurations on CEPH HDD

I changed the virtual machine settings. Also that in the first and second tests, the io-thread option is enabled, which is offered by default agent: 1 boot: order=sata0;virtio0 cores: 4 cpu: host machine: pc-q35-7.2 memory: 8192 meta: creation-qemu=7.2.0,ctime=1685091547 name: WINSRV2022 net0...

Yes, my drives are HDD type. Below is information about one of them. I understand that the performance on HDD will be an order of magnitude lower than on NVME or SSD, but now there is just such equipment. I want to understand what all the same possible optimal results I can get on this type of...

Yes. disks are really hdd. but the log and osd database are moved to nvme

I did some tests and I can't figure out if they are normal or not? Who can explain? During the test, I used --io-size 4096. According to the documentation, data is transferred between nodes with this size. Below is a link to a Google spreadsheet with the results. Rbd Bench Results

iperf3 results root@nd01:~# iperf3 -c nd02 Connecting to host nd02, port 5201 [ 5] local 10.50.253.1 port 40590 connected to 10.50.253.2 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 971 MBytes 8.14 Gbits/sec 328 1.07 MBytes [ 5]...

For several weeks now, I've been struggling to improve the performance of ceph on 3 nodes. Each node has 4 disks of 6 TB. + one NVME 1 TB where Rocksdb / Wal are taken out. I can't seem to get ceph to run fast enough. Below are my config files and test results: pveversion -v proxmox-ve: 7.4-1...