What | Removed | Added |
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CC | ian.christian@zoopla.co.uk |
Further to this, it can be reduced down to just the send, taking out of scope the SSH connection. Again it's observed that the first chunk of data moves quickly - 34s in and 806M has been written: 806MiB 0:00:34 [93.9KiB/s] However, then things then slow down significantly, while there are occasional bursts of speed, generally speaking the speed can be sene in 100-200KiB/s After 4 minutes, only 200MiB of extra data has been written: 989MiB 0:04:04 [ 144KiB/s] Here's the details on the devices: root@dbshard1a.prod:~ # btrfs device stats /sqldata/ [/dev/nvme0n1].write_io_errs 0 [/dev/nvme0n1].read_io_errs 0 [/dev/nvme0n1].flush_io_errs 0 [/dev/nvme0n1].corruption_errs 0 [/dev/nvme0n1].generation_errs 0 [/dev/nvme1n1].write_io_errs 0 [/dev/nvme1n1].read_io_errs 0 [/dev/nvme1n1].flush_io_errs 0 [/dev/nvme1n1].corruption_errs 0 [/dev/nvme1n1].generation_errs 0 [/dev/nvme2n1].write_io_errs 0 [/dev/nvme2n1].read_io_errs 0 [/dev/nvme2n1].flush_io_errs 0 [/dev/nvme2n1].corruption_errs 0 [/dev/nvme2n1].generation_errs 0 [/dev/nvme3n1].write_io_errs 0 [/dev/nvme3n1].read_io_errs 0 [/dev/nvme3n1].flush_io_errs 0 [/dev/nvme3n1].corruption_errs 0 [/dev/nvme3n1].generation_errs 0 root@dbshard1a.prod:~ # btrfs device usage /sqldata/ /dev/nvme0n1, ID: 1 Device size: 3.49TiB Device slack: 0.00B Data,RAID10: 751.00GiB Metadata,RAID10: 187.00GiB System,RAID10: 32.00MiB Unallocated: 2.58TiB /dev/nvme1n1, ID: 2 Device size: 3.49TiB Device slack: 0.00B Data,RAID10: 751.00GiB Metadata,RAID10: 187.00GiB System,RAID10: 32.00MiB Unallocated: 2.58TiB /dev/nvme2n1, ID: 3 Device size: 3.49TiB Device slack: 0.00B Data,RAID10: 751.00GiB Metadata,RAID10: 187.00GiB System,RAID10: 32.00MiB Unallocated: 2.58TiB /dev/nvme3n1, ID: 4 Device size: 3.49TiB Device slack: 0.00B Data,RAID10: 751.00GiB Metadata,RAID10: 187.00GiB System,RAID10: 32.00MiB Unallocated: 2.58TiB Any suggestions on how to diagnose this speed issue would be much appreciated!