On 21/12/2022 20:40, Frank Steinmetzger wrote:
Yes? In a mirror setup, all member drives of a mirror have the same content
(at least in ZFS).
Raid 10 distributes its content across several mirrors. This is the cause
for its increased performance. So when one of the mirrors (not single drive,
but a whole set of mirrored drives) fails, the pool is gone.
Linux will happily give you a 2-copy mirror across 3 drives - 3x6TB drives
will give you 9TB useful storage ...
I admit, I’ve never head of that. (Though it sounds like raid-5 to me.)
Raid 5 has a parity drive (or rather, raid 4 has a parity drive. Raid 5
smears parity across all disks). It does not store duplicate copies.
Raid 10 has duplicate data and no parity.
Read up on linux raid-10. It is NOT raid-1+0.
Drive sda sdb sdc
Blocks 1 1 2
2 3 3
4 4 5
5 6 6
etc ...
https://raid.wiki.kernel.org/index.php/What_is_RAID_and_why_should_you_want_it%3F
(Disclaimer - I either wrote or heavily edited it.)
Cheers,
Wol
