JPHobby Posted June 5, 2023 Share Posted June 5, 2023 Hi, just fired up my Unraid with 20 TB Exos disks. Started Parity. Two things I noticed: The parity disks (which are in another enclosure) started off with tons (thousands) of UDMA CRC errors. Currently things are quiet. Might be cabling issue. I am unsure yet. The parity buildup is INCREDIBLY slow (10 MB/sec) and will take like a month. I am in the background syncing my old NAS with rsync streams to the Unraid server. So my assumption is that due to the random writes the parity is so slow. Is this feasible? Or am I looking at something else and need to investigate? Regards JP Quote Link to comment
JonathanM Posted June 6, 2023 Share Posted June 6, 2023 Could be multiple issues. How is the enclosure communicating with the motherboard? If it's not SAS, that's an issue. Writing to the array while parity is being built will slow things down considerably as well. Does the parity build speed up if you pause the writes? Diagnostics could hold some clues. Quote Link to comment
Solution JPHobby Posted June 6, 2023 Author Solution Share Posted June 6, 2023 Hi Jonathan, Supermicro 36bay enclosure with two Expanders. Each connected to a port on the internal LSI 16i. After I stopped the writes it seems to speed up to 270MB/sec which is the maximum I would have expected. Will let it finish now and start the writes then. Moreover my two NVMes for the pool arrive tomorrow. So new day new luck. Quote Link to comment
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