mbc0 Posted May 1, 2020 Share Posted May 1, 2020 Hi, I have just built a second server and using a 2 disk SSD cache pool for the first time and it is dissapointingly slow so I am wondering if I haven't got it setup quite right as copying to the cache starts at 120mb/s and grinds to kb/s then speeds up to 30-40mb/s then down to kb/s etc. I am aware that it will write to RAM first (hence the maxed out speed initially) but I would expect an SSD cache to be faster? maybe I am expecting too much 🙂 Diags attached below during 15GB file write to cache, Many Thanks! M/B: ASRock X470 Taichi Version - s/n: BIOS: American Megatrends Inc. Version P3.90. Dated: 01/10/2020 CPU: AMD Ryzen 5 3600X 6-Core @ 4000 MHz HVM: Enabled IOMMU: Enabled Cache: 384 KiB, 3072 KiB, 32768 KiB Memory: 16 GiB DDR4 (max. installable capacity 128 GiB) Network: bond0: fault-tolerance (active-backup), mtu 1500 eth0: 1000 Mbps, full duplex, mtu 1500 Kernel: Linux 4.19.107-Unraid x86_64 OpenSSL: 1.1.1d unraid2-diagnostics-20200501-1130.zip Quote Link to comment
JorgeB Posted May 1, 2020 Share Posted May 1, 2020 Though 30/40MB/s is still slow you're using slower TLC based SSDs (WD green is TLC, never heard of a Palit SSD, but should be similarly low end, and even if it isn't the pool will be limited by the slower device), they will never perform great, I recommended 3D TLC based, 860 EVO, MX500, WD Blue 3D, etc. Quote Link to comment
mbc0 Posted May 1, 2020 Author Share Posted May 1, 2020 21 minutes ago, johnnie.black said: Though 30/40MB/s is still slow you're using slower TLC based SSDs (WD green is TLC, never heard of a Palit SSD, but should be similarly low end, and even if it isn't the pool will be limited by the slower device), they will never perform great, I recommended 3D TLC based, 860 EVO, MX500, WD Blue 3D, etc. Yeah they are low end I realize that, I use 970 Pro NVME in my other server over 10gb/e and that is blinding. This is only really a "backup" server so no real need for lightning speeds just it is alot slower than expected! Thanks for your time 21 minutes ago, johnnie.black said: Quote Link to comment
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