In terms of IOPS, their numbers seem to be on par. I tend to keep DiskSpd reports from various servers, and if I scale one of the reports I have to the spindle count I have in the cachecade server, I should only get about 750k IOPS. However, in testing this server i was getting over 2M. It was really the only time I've seen cpu load as a factor by the diskspd threads start to be a factor. Usually cpu is still minimal when the disk starts capping out but that was not the case here. I am kicking myself for not running diskspd with and without but oh well.
The other factor here is it is totally transparent...spend a few hundred bucks on a smaller enterprise class ssd, add it as a cachecade volume and you're done. If you've got money to burn on all-ssd storage then it doesn't matter, but for breathing life into physical spindles, I do consider it worth it.
If your only drives are SSDs you do not need cachecade, itis for accelerating mechanical hard drives. -and-managing-cachecade-virtual-disks-on-a-dell-perc-h710-h710p-and-h810-raid-controller?lang=en Opens a new window
here is the run down of the situation i recently decided to give cachecade a try to see if i can boost the performance of the server but after a few trys and benchmarks it seems instead of benefiting there are more problem and i have no idea what is causing it. without using ssd cache i get 8-900 MB/s seq read and usually 6-700 MB/s seq write but once i used cachecade my seq read plummeted to around 350 MB/s sometime even 100-200 MB/s write speed is around the same since dell said it only caches read. during benchmark if i use file smaller than 1gb in seq red i get the usual performance since it uses the on board 1gb catch it has on the raid controller but yea any input on what is causing will be a massive help
I created Cachecade using 2*SSD RAID 1 configuration. But I am not able to enable the ssdcaching on any VD. The option to enable ssd caching on VD is disabled in my BIOS. The VD properties is showing that it is not a cachecade capable device. What needs to be done to make a VD with Cachecade enabled ? I