On 24 June 2019 09:38:17 BST, tlaro...@polynum.com wrote:
>RAID1 puts an equal burden on both disks
Is it really equal? It doesn't depend on implementation?
>you will spend your time replacing disks praying that they
>not both die at the same moment.
This is one argument for not mirroring SSD's. I'm not sure how useful it is or
if this problem really happens. I know one person who says it does and has
experienced it.
Maybe with two SSD's RAID0 is better? Or four SSD's with RAID10?
I am pretty sure schemes like the ones you have decided have been investigated.
Maybe they already exist in some volume management systems?
I would suggest asking around in some technical, storage-related mailing lists.
Linux has a lot of these.
This is a very complicated problem. Not only that, but I'm not sure NetBSD is
a great OS for this. What are your options for filesystems, disregarding the
RAID part?
Illumos or FreeBSD might be good.
I still don't understand the problem you are trying to solve. Is it to improve
longevity of RAIDed disks? Or do you need a fast local tier that is a subset
of your full data set?
Andrew
