On 2023-01-24 17:40, Tom Smyth wrote:
Hi Atanas,
in general (not specific to RAID5 Softraid in OpenBSD... )
I would advise the following based on my own experience...
Raid5 in hardware raid generally has poor write performance due the
number of actual writes to disk per
write operation to the raid controller ( parity reads and rewrites
once you write to disks) see
https://www.arcserve.com/blog/understanding-raid-performance-various-levels#:~:text=This%20means%20that%20a%20RAID,write%20performance%20is%20NX%2F4.
becuase of the number of physical writes per raid device write...
Raid5 and SSDs dont really go together... ... unless you like
replacing SSD Disks in your arrays...
suggest meet and potatoes RAID 1 or Raid 10 ... for ssd ... and you
then dont suffer write penalties... associated with Raid 5...
Thanks for your reply!
It really makes sense, and it looks like I'll switch to RAID1.
Best wishes,
Atanas
