December 11, 20241 yr Hi, I was running a preclear on 2 drives as they suddenly got a severe drop in write performance. Write speed dropped from around 200MB/s to 25MB/s on both drives. IIRC there was an update for "Unassigned Devices" on that day (2024-12-09). Since then I have added one of those as parity to my array and the parity rebuild is going ahead with 25MB/s at best times. The other one is in a preclear operation at 25MB/s. unraid-01-diagnostics-20241211-1123.zip Edited December 11, 20241 yr by Plak
December 11, 20241 yr Author The strangest thing happened. The parity sync speed recovered after I posted the diag. Currently it runs with up to 275MB/s. Preclear on the other drive is still stuck at 25MB/s.
January 9, 20251 yr Author I added more disks to the array and was stuck with 15MB/s write speed on the array for 2 weeks now. Today I looked through the syslog and I found errors like "BAR 7: no space for [mem size 0x00100000 64bit pref]". A search led me to these threads: Followed the advice and found SR-IOV Support in BIOS Disabled Enabled it and put in pci=realloc=off into /boot/syslinux.cfg- Array is back to high speed. Parity sync running at 200-280 MB/S. Once the sync is done I will reboot without pci=realloc=off and see if the BIOS setting alone is helping.
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