OrdinaryButt Posted March 13, 2022 Share Posted March 13, 2022 (edited) I am currently transferring 500GB from unassigned drive (onboard SATA) directly to a disk of the array (also onboard SATA) via Krusader. Both disks are capable of doing 160-100MB/s and both parities can do 270-200MB/s (all numbers from recent pre-clear). The files are mostly large (gigabytes) and should be sequentially written to the unassigned disk. It started transfer at 90MB/s and then slowed down to 45 within 15 minutes. There is nothing else using the disks and CPU is hoovering around 25% (not much else running). After the noticed slow down, I started pre-clear on another drive (USB3.0) that should be able to do easily over 120MB/s (based on copying some files) but it is only doing it ~45-50MB/s. Am I getting penalized because of the dual parity or is something else going on? CPU: i7 6700T Mobo: Gigabyte G150-GSM with 5 out of 6 SATA ports in use + M.2 Cache (currently also in idle). Edited March 13, 2022 by OrdinaryButt Quote Link to comment
trurl Posted March 13, 2022 Share Posted March 13, 2022 https://wiki.unraid.net/Manual/Storage_Management#Array_Write_Modes 1 Quote Link to comment
OrdinaryButt Posted March 13, 2022 Author Share Posted March 13, 2022 11 hours ago, trurl said: https://wiki.unraid.net/Manual/Storage_Management#Array_Write_Modes Thanks. I definitely missed the turbo mode option in the 2 months of learning and testing. However, that doesn't answer the subject line question - everything else identical, will dual parity be slower than single parity? New question: Can I manually activate turbo mode when knowing a large data transfer will take place than de-activate it at the end? Quote Link to comment
Squid Posted March 13, 2022 Share Posted March 13, 2022 1 minute ago, OrdinaryButt said: New question: Can I manually activate turbo mode when knowing a large data transfer will take place than de-activate it at the end? yes You can do it at any time, even if a write is in progress 1 Quote Link to comment
itimpi Posted March 13, 2022 Share Posted March 13, 2022 12 minutes ago, OrdinaryButt said: everything else identical, will dual parity be slower than single parity? Should be same speed (unless you happen to have a very slow CPU that struggles with the more complex parity calculation used for parity2). 1 1 Quote Link to comment
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