Performance issues in same hardware

C

costasppc

Member
Feb 3, 2022
6
0
6
54
Hello,

We have 2 installations of PVE 8.4.14 on 2 x DELL SERVER PE R360 XEON 6353P/32GB/480GB/H755, using 2 disks as RAID1 (on the controller). In each of the PVE we have a Windows Server 2025 machine, with identical specs and setup (2 different sites), lets say 02 and 03.

We started to have complaints from the 03 site, and started digging, we find out that the PVE and the VM on site 03 are acting slow (see pveperf attached images on 02 and 03).

We checked the VMs inside using the same diskspd command (maybe the block size should be change, but we wanted to see how they will react):
diskspd -b256K -d120 -h -L -o2 -t4 -r -w30 -c250M c:\io3.dat
and there is a huge difference there as well (see attached images).

Also attaching images of the VM setups, maybe we missed something there.

Any help will be greatly appreciated.

Best regards

K
 

Attachments

  • 02-GOOD-PVEPERF.png
    02-GOOD-PVEPERF.png
    67.6 KB · Views: 8
  • 03-BAD-PVEPERF.png
    03-BAD-PVEPERF.png
    62.4 KB · Views: 9
  • 02-GOOD-diskspd.png
    02-GOOD-diskspd.png
    745 KB · Views: 10
  • 03-BAD-diskspd.png
    03-BAD-diskspd.png
    723.9 KB · Views: 10
  • 02-GOOD-VM.png
    02-GOOD-VM.png
    207.8 KB · Views: 10
  • 03-BAD-VM.png
    03-BAD-VM.png
    219.4 KB · Views: 9
So, here are the news:
We went to the problematic site with a same server hardware, and swapped the drives (importing foreign RAID). Performance worked as expected. We got the problematic server hardware, and installed the drives from the "good" one. Performance worked there as expected. We opened a ticket in Dell for both servers, and send support logs. Dell says nothing is wrong with the servers or disks, but they dont support Debian 12 as OS.

The only thing that was different on the "bad" server was that the server profile was set to Performance per Watt instead of Performance, but we changed it and rebooted it, and disk performance was the same.

Best regards

K
 
You must log in or register to reply here.
Top Bottom