Re: RAID10, 3 copies, 3 disks

Il giorno sab 11 gen 2020 alle ore 22:25 Wols Lists
[off-list ref] ha scritto:

Multiple 3-way mirrors (1+0) requires disks in multiples of 3. Raid10
simply requires "4 or more" disks. If you expect/want to expand your
storage in small increments, then 10 is clearly better. BUT.

I'll start with 8TB usable (more than enough for me atm) and would be ok
for at least 1 year, thus saving space is not a problem. Next year, if needed,
i'll add 3 disks more (or i'll grow the existing ones)

Depending on your filesystem - for example XFS - changing the disk
layout underneath it can severely impact performance - when the
filesystem is created it queries the layout and optimises for it. When I
discussed it with one of the XFS guys he said "use 1+0 and add a fresh
*set* of disks (or completely recreate the filesystem), because XFS
optimises layout based on what disks it thinks its got."

No XFS, i'll use ext4.
I had *TONS* of issues with XFS