October 23, 20232 yr Community Expert This is my backup unraid server. It was populated with rsycn ove lan and ran nicely at 100-110 so all disk IO was good then. I just added an 8TB drive - ram a pre clear first. no errors. Just added it to array and formatted. trying to move data to it from other disks (a long process as a total of 15TB will be needed). But the speeds it is dong - 0.6MB/s !!!! No errors in the logs, no smart errors, everything seems to be operating normally. Where can I look to fault find this ?
October 23, 20232 yr Author Community Expert So I ran the DiskSpeed container and let it run. It seems like the parity disk is the culprit here - not the new disk (or the parity disk speed was affected by the adding of the new disk) The parity speed was only 1.1MB to 5.5MB max. No errors in the unraid logs again. I will swap some cables around and see what happens.
October 24, 20232 yr Author Community Expert Solution Solved somehow my moving the 2 port sata card from one PCIe to another slot......
October 24, 20232 yr Author Community Expert Spoke to soon - while the benchmark looked like it was fast again - the unbalabce trailed off the next to nothing again. I will move my spare HBA card into place - once I find it in the garage!!!!!
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