On Wed, 4 Nov 2020, Russell Senior wrote:
My nvme foo is weak, but I think your partition on an nvme is going to
look like /dev/nvme1n1p1 or something. I just checked one of my
machines and confirmed that naming.
so, modify your mdadm command to use /dev/nvme1n1p1 /dev/nvme2n1p1
/dev/nvme3n1p1 /dev/nvme4n1p1 at the end.
On Wed, Nov 4, 2020 at 1:04 PM John Jason Jordan <[email protected]> wrote:
On Tue, 03 Nov 2020 16:51:38 -0800
TomasK <[email protected]> dijo:
Correct - you need to setup ordinary SW raid - follow mdadm
documentations.
https://www.educba.com/what-is-raid-in-linux/
https://raid.wiki.kernel.org/index.php/RAID_setup
in this order ....
OK, software RAID is what I need. That eliminates the problems you
discussed, plus I can't figure out how to use whatever RAID features
exist on the PCIe cards that the U.2 drives are physically mounted on,
so to heck with them.
My first problem was that mdadm was not installed. This computer has
Xubuntu 20.04.1, so that surprised me. But no trouble, apt was happy to
install it.
I will ever so humbly and politely throw my wrench in here...
Have you considered using ZFS rather than mdadm+xfs/ext? Ubuntu 20.04
has native packages. I find it easier to maintain than a mdadm device,
plus you get compression (if you'd like) and checksumming for free.
You can easily create setups akin to RAID1, RAID5, RAID6, or RAID10.
E.g., for RAID10
# install the package
apt install zfsutils-linux
# create a pool named 'myarchive' with a mirrored device
zpool create myarchive mirror nvme1 nvme2
# add a second mirrored to device to 'myarchive'
zpool add myarchive mirror nvme3 nvme4
# create a zfs filesystem in the the 'myarchive' pool,
# mounting it as /data and enabling default compression
zfs create \
-o compression=on \
-o mountpoint=/data \
myarchive/data
Anyway, that's my troublemaking for the day...
--
Paul Heinlein
[email protected]
45°38' N, 122°6' W
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