Andiroo2 Posted February 2 Share Posted February 2 (edited) Background: I have 5x 2TB NVMe SSDs in a RaidZ1 pool (non encrypted, some datasets have compression and some do not), used as my cache. I'm sitting between 80% and 90% utilization at any given time (8TB usable, ~1TB free). Moving large files within the pool is very slow compared to when I was running the same drives in a BTRFS Raid1 pool (5TB usable). Moving a 5GB file from folder A to folder B within the cache gives me consistently less than 500MB/s transfer speed (usually much less), while I was seeing around 1.5GB/s on BTRFS. Not sure what I can check here. Could this be due to the higher pool utilization? I have a 10th gen i7 and 48GB of RAM, and the system isn't taxed. The PCIe bus is 3.0 and all NVMe's have DRAM. Thanks for your suggestions! Edited February 2 by Andiroo2 Reasons Quote Link to comment
JorgeB Posted February 2 Share Posted February 2 20 minutes ago, Andiroo2 said: Not sure what I can check here. Could this be due to the higher pool utilization? What is the current pool utilization? I've moved from a btrfs raid5 pool to zfs raidz1 pool and see similar speeds, even a little faster with zfs, I used to get around 1GB/s, now get 1.5GB/s when copying data inside the pool. Quote Link to comment
Andiroo2 Posted February 2 Author Share Posted February 2 Sitting at 88% right this minute: Quote Link to comment
JorgeB Posted February 2 Share Posted February 2 Mine is not much below that: Please note that I have a large ARC and I mostly copy data that is on the ARC, for data not on the ARC I usually see around 1GB/s Quote Link to comment
Andiroo2 Posted February 2 Author Share Posted February 2 OK I increased my ARC to 1/4 of RAM instead of the default 1/8. Will see what happens. Quote Link to comment
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