Speed Problem external Storage

[computerhouse]

Dear community,
I have a problem of speed with external storage connected via iscsi.
Customer's setup:
2 Lenovo SR630v4 hosts, each with 2 Intel Xeon 6517P CPUs
256 GB of RAM per host and SFP+ NICs for iSCSI connections
Lenovo DE2000H storage connected via SFP+ to the hosts
RAID 5 configured on the DE2000H with SAS SSD drives
Multipath is configured and is working fine
Everything seems to be working fine, but the VMs are just very slow.
I've already tried various things like adjusting the CPU, RAM, machine type, etc...
What i tried else for testing is moving the vm to the local-lvm it is faster but not so....
Has anyone else had this problem, or is it a compatibility issue between Proxmox and Lenovo?
Another customer has exactly the same setup—the only difference is that they use VMware, and they have no speed issues at all.
I’ve already spent a lot of time troubleshooting, but so far without success.
Does anyone have any ideas?
Thanks in advance
Claude

 

[waltar]

DE2000H is an old low cost external ha-raid storage system (with very old Netapp E-series ctrl's, tech spec max 3GB/s read seq, max 100k/r + 35k/w iops) and you are running it in raid5 as mentioned. Assuming you run iSCSI in 10 and not 1Gbit mode between but even 10Gbit is just around max 1GB/s. If you want any useful perf from you should run it with raid1 volume sets ... and anyway begin to plan a storage refresh of any kind of for your pve hosts.

 

[computerhouse]

Hi Waltar,
Thank you very much for your quick response. I willl try RAID 1, if that doesn't work, I'll start planning some kind of storage upgrade for the PVE hosts.
Best regards
Claude