Storage-Speed / ZFS questions / HBA

[shithead75]

Hi! I am currently testing disk performance with different setups, just to find out what is working best, and I am observing strange behavior - or I am simply doing something wrong here

My Setup:
- Proliant ML30 G10 / 64GB Ram (not a rocket but shold do)
- Brodcom HBA 9400-16i with an 4-drive-U3-Enclosure and (after some trouble) with the correct cables.
- 4x Micron 7450 Pro Drives 1920GB
- everything is recognized correctly in Bios/HBA/Proxmox.
- Evaluation Version of MS Server 2025 Standard, VirtIO drivers installed, Updates installed, PVE 8.4.0

Drive Specs:



First Test:
- Single Drive, lvm-thin, just to get a feeling for the drive performance:


The reading RND4K-IOPS are far lower than in the specs, the rest is looking like a nice starting point.

Note: Always ensured that the server has completely booted and CPU is staying as low as possible to avoid other processes to interfere.

Second Test:
- RAIDZ with all 4 drives

My expectations: Reading up to 2-3 times better, writing the same or a bit less speed

My results:


Am I missing here something, or are my expectation simply to high ?

Thank you very much for any feedback / hints / etc.!

 

[LnxBil]

- Single Drive, lvm-thin, just to get a feeling for the drive performance:

So, the drive performs twice as good as the specs say in sequential read?

 

[shithead75]

Thx for your reply!

Yes, I noted this too, maybe drive-cache-Impact? But what I am more wondering about is RaidZ not showing any performance or IOPS gain when reading from more than 1 disk.

Is there any ZFS configuration / tuning necessary? I simply created the RAIDZ via PVE-GUI....
Or on the HBA? Did not play with storcli by now....

 

[meyergru]

IDK what you are expecting from your HBA, which is a PCIe 3.1x8 device that maxes out at 7.8 GByte/s?