Sudden and dramatic speed loss on md RAID array transfers via HBA 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 Network stack: \- 2x X520 10GbE cards \- Intel SR transceivers \- Generic eBay fiber \- Brocade 7250 switch w/ same Intel transceivers \- Asus domestic (consumer) router \- no vLan / LACP or fancy setup (yet) Possible culprits: \- Any of the above but the networking stack \- ??…