Slow read speed on iSCSI

[HoneyBadger]

So what would be the solution then?

More RAM, a general bit of understanding about ARC behavior, and an understanding that when you request something that isn't in the ARC buffers that it's going to be slow.

Yes

ARC works off trying to find the balance of MFU (Most Frequently Used) and MRU (Most Recently Used) data in your pool. If you've just rebooted, your ARC is empty - no data has been read off the pool yet, and nothing's been written other than maybe whatever housekeeping Windows did when it mounted the drive. When you fire up CDM and tell it to benchmark, you're firing 1GB of new writes to the pool as it builds that test file. Since ARC is empty, that 1GB of fresh new data lands in RAM, and gets to stay in ARC because it's not only the MFU (Most Frequently Used) but definitely the MRU (Most Recently Used) data. Once you actually use the pool for more than just benchmarking, the actual data set in question doesn't fit into RAM (isn't COD:Warzone something like 250GB on its own now?) so you end up missing data and having to pull from spinning disk.

 

[Askejm]

Ahh alright thanks sorry for asking so many questions

 

[elimedina2022]

Ahh alright thanks sorry for asking so many questions

Just in case and just because I was going crazy. If you use Windows 10-11 and using latest Onedrive, it turns on auto backup, so if you move anything to desktop or document, etc-IT will lower your speed to 1/8th your speed!!!!!!!!!!!!!!!!!!!!!!!!!! As soon as I disabled, Speed for read went to almost gig speeds! What a relief!