Could you please provide information about enabling ssd cache function on RS3DC080?
In which proportion it is necessary to combine hdd and ssd? 2 ssd + 6 hdd ?
If i'll take 6x6Tb hdd + 2x500Gb ssd i'll get 6x6+2x0.5~36 Tb hybrid array? or 6x6=36Tb array with 1Gb cache?
Could i take 7200 6Tb HDD or i need 10k/15k ones?
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The RAID controller RS3DC080 is SSD capable by default. There is no need to enable any function in RAID bios or anywhere else.
About if there is any recommended proportion there is none. What it is recommended is to not combine ssd and hdd in the same RAID volume. All SAS hdd speeds are supported. For more info you can check the following document: https://www.intel.com/content/www/us/en/servers/raid/raid-controller-rs3dc-brief.html https://www.intel.com/content/www/us/en/servers/raid/raid-controller-rs3dc-brief.html
I think I misunderstood your initial question about if this particular RAID controller supports the SSD cache (CacheCade) feature. I apologize for that. The answer is yes as stated in this document: https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/raid-controller-rs3dc-br... https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/raid-controller-rs3dc-br... The hardware key to enable such feature needs to be bought separately but I am not sure if it is still available since there is a new generation of RAID controllers out in the market already (Tri-Mode RAID Controllers).
About how to connect 128 hdd the answer is using a JBOD unit https://ark.intel.com/products/86950/Intel-Storage-System-JBOD2312S3SP https://ark.intel.com/products/86950/Intel-Storage-System-JBOD2312S3SP
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