If a second drive is used it is strictly the media drive holding the work as an example video snippets or music scores. In some cases I have used larger PCIe/NVMe drives but thats when that was the only drive in the system. I would break the Fusion Drive set and just use the PCIe/NVMe as the boot drive hosting my OS and my apps with the rest of the drive unused! I mostly stick with 512 or 1TB drives for this depending on what the client workflow is. So each write is written the the PCIe SSD then written to the SATA SSD which is why your system is so slow as the depth of the SATA I/O buffers are not deep enough Vs your PCIe/NVMe ability to write. Remember the function of the SSD in a Fusion Drive set is acting as a Cache for the HDD! Basically, the PCIe SSD is not seen as a discreet drive within the macOS (look at your disk information pane under The About This Mac Storage tab all you’ll see is the one Fusion drive of the HDD’s space of 2 TB (the 2 TB of the SSD in your case is hidden!) Gaining the performance the SSD without the heavy cost of a much larger SSD. That defeats the purpose of why the Fusion Drive was created in the first place which was to off set the cost of the more expensive SSD with a cheaper HDD drive. I would never setup a dual SSD Fusion Drive. I’m not sure I follow why you created a Fusion Drive using these two SSD! Samsung 970 EVO Plus 2TB M.2 PCIe/NVMe SSD & Samsung 860 EVO 2TB 2.5” SATA SSD Once only 10% to 15% of available disk space remain, the amount of disk I/O seems to pick up noticeable. Mac OS creates lots of temporary files (logs, swap, etc.). P.S.: Also never fill up your SSD to more than 85% to 90% of its capacity. Can a cheap-ass adapter from Aliexpress be the reason?Įdit: In MacRumors: internal SSD is overheating, how to fix thread I found the following information: Have you encountered such issue? I can install some thermal pads and a radiator on M.2 SSD, but still - this does not seem normal. The first round of benchmarks gives better results (500MB/s / 2800MB/s), but everything after is limited - clearly a throttling does occur. I also replaced CPU to i7-7700, the temps in idle are fine: In idle, when I am not doing anything the temps are not much better: I am wondering if this might be an overheat problem - while doing benchmarks I am getting:Īnd Samsung SSD Temps: 950, 960, 970, 750, 840, 850 and 860 EVO and PRO series are rated for operation between 0✬ and 70✬. Also, the read speeds are extremely inconsistent - one time it is 900MB/s, the other 1800MB/s (but usually around 1800MB/s). After installing Big Sur everything was fine - benchmarks reported ~3000MB/s write/read speeds, OS reported 4TB of free space in a single partition.Īfter a while (and filling my disks with 3.5TB of data) my write speeds are ridiculously slow - Blackmagic Disk Speed Test shows something between 90-300MB/s, and from time to time it even drops to zero and system freezes. Samsung 970 Evo Plus 2TB (got the latest firmware version)Īt the first boot, in the recovery menu (alt+cmd+r) I have formatted both of these drive to APFS and merged them into one partition (diskutil resetfusion command).I have replaced built-in SSD and HDD with:
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