Hello. Hoping someone can offer some help. I'm seeing extremely slow writes to the cache of my new unraid server. I'll try to set out what I've been doing below, along with things I've tried. I'll gladly provide any more info if you need it. I've attached my diagnostics as seems to be the norm, and also a screengrab of a large transfer (c. 80GB) to show the issue. I took the diagnostics during the transfer in the screenshot.
I also noticed that the CPU is pretty much pinned while the transfer is going on (screenshot also attached), but when I looked in the processes tool, I couldn't see anything with high usage. Is this normal? CPU is an i5-4590.
My setup is:
2x 240GB SATA SSDs for cache. These are set to the typical Raid 1.
I have the trim plugin installed and set to daily. I also ran it from the terminal.
I have the cache pool set to maintain 20GB of free space, and there is plenty left on the SSDs.
Cache is set to "Yes" in the share I'm writing to. I've also confirmed it is indeed being written to the cache pool.
Speeds were ok for the first couple of transfers I made, about 85MB/s, then suddenly dropped mid transfer to 20MB/s and have pretty much stayed there since.
Many thanks for any help you can offer!
old-hen-diagnostics-20201218-1602.zip