Thank you again..
As for your thoughts i completely agree in general.
I'd be curious to see those Pool B test results with hosts having direct access to controller B. It would be interesting to see what the true penalty is for you of not using an optimized path. Ideally you should consider getting addition FC cards in each server or replacing with 2-port cards. In your case, having only a single 1-port card in your servers will cause a complete outage if Controller A goes down. Also, it prevents you from ever doing an online firmware upgrade on the MSA (which is possible if hosts have access to both controllers). Anyhow, that is a side point.
I want to do this for sure even though when i 1st created the volumes and did some tests i didnt saw speed difference at all in the MDL's if a host is connected to either controller. At start i had 2 Hosts in Controller A and the other 2 Hosts in controller B but either way now that i am finished i will test that for sure but not for the next 2 weeks since today i go on vacations :-) and i hope the system will stay up and healthy here.
As for the SSD's in my 1st question i had read it somewhere and i saw also here that you gain in Raid 10 with 4 disks or more .. maybe this site says something wrong but if you set there 4 disks with Raid 10 there it will tell you that you get
4 x read speed and 2 x write speed which is logical.
In comparison if you do 2 raid 1 pools then for each one you get 2 x read and 1 x write which seems same as the 1st scenario but what i dont know is how the MSA behaves. I mean the data in 2 exact same volumes are written in both simultaneously? or the MSA decides where to write? My gut thinks that it writes only to 1 and then to the other etc like round robin or something, correct me if i am wrong here because this is not written somewhere (or i havent found it). Same exists for the reads.. So if i am not wrong and the site that i said to you is also not wrong then by creating a Raid10 with 4 disks will be faster because the MSA in a write situation will write in all 4 disks and then in the Read all 4 Disks will give data (or something like it).
For my 2nd question your reply is what i was expecting so maybe i will w8 to 1st get dual cards for all the hosts and then the 8x600GB disks will go to pool B with 2 or 3 SSD's and i will be fine.
And a question again :-) why MSA doesnt let you delete a Disk group if in the controller that has that pool exist another disk pool with empty space to cover this delete? i mean this could had been perfect to be able to delete but wait till the MSA copies everything in the other Disk Group no matter how much time this would need.... its an idea .. maybe stupid but it could had been cool if it was able to do that...
Thx again..
Kind Regards
Chris
P.S. Sorry for my english in general