Hi guys, yet another lost soul in the pits of RAID, however I've been looking for precise numbers rather than notions on the internet but it's hopeless, here's my case
environment : 5 PCs, all running Windows and all 10Gbe network
1 for backing up the projected RAID server, and the other 4 as workstations, of which only up to 2 will be accessing the sever at a time, however traffic is gonna be around 1.5-3 TB per day and 1 day can't get on top of another, or I'll be in trouble
ok, HBA's are the hardware, already bought, in shipping now, 2X LSI 9300 8i's, those are gonna be living in an LGA 2011-3 board, 1 having a RAID 10 pool and the other a RAID 6 pool, both pools made of 8X WD 8TB Reds each
note that the server will not have any VMs or any app running for that matter, other than serving those workstation, and FAST, the file sizes range from multiple hundreds of Kb sized files to many files in the 70-90 Gb each, so it's all over the place
also note that since we own a Windows server 2012 license, we'll be using that
given the ammount of data going through, no SSD caching will be implemented, hot data tracking being completely useless in this case
and now my actual question, since those 2 HBAs are gonna be linking the HDDs directly to the CPU in a way, and there are gonna be 2 raid pools of 8 HDDs each, 1 RAID 6 and 1 RAID 10, and all the calculations are gonna happen on CPU, which has nothing else to do, Riddle me this : HOW MUCH IN NUMBERS is this type of setup gonna use CPU say for RAID 6, PLUS dealing with 2 aggregated 10 Gbe links ?
all I can find on the internet is "an ROC will offload the parity calculations from the server CPU" and NOWHEWRE does it say HOW MUCH IS THAT IN NUMBERS ??? NOT ONE REAL WORLD EXAMPLE or ANY theoretical system, please note that I can't sell the HBAs and get ROCs, this is not my choice however I'd like to complete this project the way it's going ... basically my question is will a 5820 do ? or will I have to go E5-2699 V4 so to speak, or actual ... as far as ram is concerned, I know this is Windows so depending on the CPU chosen, probably as much memory as it supports will be installed
the CPU is not gonna be doing anything, so if this setup will be using 12 or 24 or 72% of this or that CPU, one can have an accurate prediction of how things will go, but installing a CPU and seeing constant 95%+ use while writing files isn't optimal ...
I'm sorry but nowhere am I seeing something like, "I have windows server 2012 running on [this] sever, and my HBA connected 8 drive raid6 is using XX% of this or that CPU", NO numbers to be able to begin to figure this out