June 13, 20242 yr HI, Copying between two Unraid servers on the same network connected 10G nics thru 10G switch using DirSyncPro and FreeFileSync containers. What´s the typical bottlenecks? Shouldn´t this run way faster?
June 13, 20242 yr Writing to multiple array devices at the same time is always slower, due to parity overlap, also note that those QVO devices are limited to around 160MB/s write speed once the small pseudo SLC cache is full, still they should perform much better in a zfs pool
June 13, 20242 yr Author The QVO limitation I know, but parity overlap should that have an effect as it is a nvme ssd?
June 13, 20242 yr Turbo Write might help. That said, SSD's in the array is not a good idea because TRIM is disabled there slowing the SSDs down to a crawl after a while. Make a ZFS or BTRFS raid pool instead, not only will TRIM be available but making it the right kind of raid will speed things up a whole lot. The array as it stands atm. is meant for old fashioned spinning rust only.
June 13, 20242 yr 3 hours ago, frodr said: but parity overlap should that have an effect as it is a nvme ssd? It can still happen, depending on the device, I'm not familiar with that model, but most current NVMe devices cannot sustain high write speeds for long, they can drop to <1GB/s after a few seconds, some to much lower than that, and don't forget that array devices cannot be trimmed.
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