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... On Tue, 24 Jan 2023 at 15:05, Atanas Vladimirov <[email protected]> wrote: > > Hi Guys, > > I wonder if someone here is using RAID5 with HDD drives and what write > performance on such discipline is expected? > I have 4x 1T HDDs and can't get more than 10~12 MBps on writing. > > I found a Reddit post [1] where the user observed a similar write speed, > of course, he was using other drives (Model and Size). > My curiosity (and the reason I'm asking here) comes from the fact that > we are observing very similar speeds. > > So, do you use RAID5 and how it behaves on your side? > > > [1] > https://www.reddit.com/r/openbsd/comments/srru20/raid5_write_performance/ > > P.S.: Anyone using RAID5 with SSD drives? How is the write speed there? > > Best wishes, > Atanas > -- Kindest regards, Tom Smyth.
