Infrasonic wrote:hiriskpaul wrote:However, there are a few oddities. I cannot get my SSDs to work reliably with either ntfs or ext4.
Curiously as well, real world read testing seems much worse than writing. Reading back my 3 large files and writing to my local SSD gives only 35MB/s. Anyone know why that might be?
SSD's rely on cache, the better (more expensive) the SSD the more cache it will have (generally SLC).
When you do large file transfers the cache gets saturated and the performance drops off a cliff, sometimes below that of a HDD!
No way out of it other than stumping up for decent branded high performance SSD's (Samsung et al).
In general it's best to have a good DRAM/SLC cache SSD as a boot drive, cheaper DRAMless/small cache as data drives are fine (unless you routinely handle large files).
Long life NAS specific SSD's are now available (WD red £,Seagate Ironwolf ££ and Synology £££ --very expensive with power failure caps et al like enterprise drives).
I think modern Synology NAS' are BTRFS by default these days rather then EXT*.
My SSDs are all Samsung EVOs of one sort or another. Running my large file backup test case (3 files, 21.33 GB) and backing up to a USB3 attached 500GB EVO 850 takes 1 minute 18 seconds (about 280MB/s). Reading them back in and writing to my local SSD takes 1 minute 13 seconds (300MB/s).