Booting from NVMe USB enclosure

[rych]

Other speed tests on the new Asmedia ASM2364 enclosure:

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hdparm -t --direct /dev/sda3

/dev/sda3:
 Timing O_DIRECT disk reads: 2466 MB in  3.00 seconds = 821.73 MB/sec
hdparm -t --direct /dev/sda4

/dev/sda4:
 Timing O_DIRECT disk reads: 2466 MB in  3.00 seconds = 821.45 MB/sec

Writing on ext4

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dd if=/dev/zero of=/mnt/sda3/tempfile bs=1M count=1024 conv=fdatasync |& tail -1
...630 MB/s

...reading it back:

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sudo sh -c "/usr/bin/echo 3 > /proc/sys/vm/drop_caches"
dd if=/mnt/sda3/tempfile of=/dev/null bs=1M count=1024 |& tail -1
...1.0 GB/s

-- again with almost identical numbers for the NTFS (ntfs3 mounted) partition

Interestingly, mounting NTFS using ntfs3 kernel driver, the speed of accessing it is identical to the speed of the adjacent ext4 partition on the same USB.