Hey,
I'd like your input to try and diagnose this one. As title, my transfer speeds suddenly slowed by 99% (1 GBps -> 10MBps) during intensive transfers, and it didn't recover overnight. Tried to speed up server fan speeds (R530) to 100% for a while to no avail; it recovered temporarily, but went back to abyss rather quickly; and as mentioned an extensive pause afterwards didn't help either.
Setup:
- Dell R530 server
- Proxmox hypervisor
- Dell LSI 3008 HBA 12Gbps
- OMV VM w/HBA passthrough
- md RAID 5 array in OMV, 12 drives wide
- Generic eBay SAS cable
- Storwize v7000 SFF disk shelf w/12Gbps controllers
- 900GB SAS drives
Possible culprits:
- Any of the above
- ??
Unlikely culprit:
- Overheating of the HBA because one night cooldown or 100% server fan speeds neither solved a thing, unless it got permanently damaged during initial overheating.
Please either 1) suggest other culprits I couldn't imagine yet, or 2) point to the likeliest one. I can painstakingly test everything because I do have backups for everything hardware wise, but as you can imagine this would require quite a while to go through each and every component.
Failing advices, I'll start with the cable; both easiest to test and likeliest one IMHO.
Thanks!