I have it running on two machines now that needed big RAID 10s:
# uname -rv
5.4.0-72-generic #80+TEST1896578v20210504b1-Ubuntu SMP Tue May 4 00:30:36 UTC
202
# df -h /opt/raid
Filesystem Size Used Avail Use% Mounted on
/dev/md0 30T 208G 29T 1% /opt/raid
# cat /proc/mdstat
Personalities : [raid10]
md0 : active raid10 nvme7n1[7] nvme6n1[6] nvme5n1[5] nvme4n1[4] nvme3n1[3]
nvme2n1[2] nvme1n1[1] nvme0n1[0]
31255576576 blocks super 1.2 512K chunks 2 near-copies [8/8] [UUUUUUUU]
[>....................] resync = 0.1% (48777600/31255576576)
finish=2514.8min speed=206813K/sec
bitmap: 233/233 pages [932KB], 65536KB chunk
FWIW the mkfs.xfs took ~1 minute across 8x8TB NVMe disks with this
patched kernel.
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https://bugs.launchpad.net/bugs/1896578
Title:
raid10: Block discard is very slow, causing severe delays for mkfs and
fstrim operations
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