On 2017-05-03 16:39, Peter Suetterlin wrote:
So the big question is what is wrong with the SSD RAID? Is it the number of disks, the LSI card, the size of the volume? Did anyone see similar problems before? Any input is highly welcome :)
I don't use big iron myself, but an idea: what mount options do you use? In particular, I'm thinking about the absence of "noatime". It's absence makes each "read" of a file slower, having to write the time to disk. Besides that, it seems that you should consider replacing with "lazytime". The access time is then written on bunches and when feasible, not "now". Less wear and faster, even on SSD. In any case, just post here the mount lines of all your mentioned arrays, so that people here can take those into consideration. Then, I would point you as well to the XFS mail list. They are very nice and helpful. The volume is sometimes higher because they post also PATCH mails. And the subject line lacks a list identifier. -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" at Telcontar)