October 2, 20187 yr I'm transferring from a locally attached external usb 3.0 drive to a 7200rpm HP Enterprise drive (disk 1) -- parity drive is also a 7200rpm HPE. Both transferring smaller files (~30MB CR2 files) and larger files (4GB ISOs) I see ~25MB/s using rsync. Here's what I see as a peak on the array devices screen. All disks are using onboard SATA III in AHCI mode (motherboard) except for cache SSDs which are on a pci card md_num_stripes=2048,md_sync_window=768,md_sync_thresh=384 The share I'm transferring to on disk1 is set not use cache Barely using my cpu/memory Read speeds using diskspeed.sh look fine: /dev/sda: 158 MB/sec avg /dev/sdc (Disk 4): 130 MB/sec avg /dev/sdd (Disk 3): 173 MB/sec avg /dev/sde (Disk 1): 139 MB/sec avg /dev/sdf (Disk 2): 116 MB/sec avg /dev/sdg: 499 MB/sec avg /dev/sdh (Parity): 141 MB/sec avg /dev/sdi (Cache): 369 MB/sec avg /dev/sdj (Cache 2): 367 MB/sec avg I was getting about the same speed for parity check which seems woefully slow compared to some of the user benchmarks. Is ~25MB/s really the best I can expect?? Edited October 2, 20187 yr by FoxxMD specify cache use, read speeds, and load numbers
October 2, 20187 yr Community Expert That speed does seem low. However if that is also the same sort of speed you are getting for a parity check then it sounds as if something is limiting throughput. you should post your system diagnostics zip file (obtained via Tools->Diagnostics) so that others can look to see if they can spot any issues. Giving a time around when you were experiencing the issue can help pinpoint which part of the logs might be relevant.
October 2, 20187 yr Pls try turn on reconstruct write（turbo write）and confirm the USB device in 3.0 port instead 2.0 Edited October 2, 20187 yr by Benson
October 2, 20187 yr Community Expert You could also try copying from another source. Most people get a little better speed than that even over GB ethernet. Or try copying from one disk on the server to another to see if you get different results.
October 2, 20187 yr Author Quote Pls try turn on reconstruct write This has made the most difference so far. Doubled my write speed -- ~48-53MB/s depending on file size (small-large respectively) Quote confirm the USB device in 3.0 port instead 2.0 Confirmed, double-checked port and also checked with lsusb /: Bus 09.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M I have also attached a diagnostics zip for those interested. I tried several different transfer methods IE over my GB ethernet and disk-to-disk but still saw speeds capped around 55MB/s. This is much better but still seems low. tower-diagnostics-20181002-1747.zip
October 3, 20187 yr Everything should be normal, just some bit slow, pls note writting to array will limit by slowest disk in array and seems be disk2, /dev/sdf (Disk 2): 116 MB/sec avg
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