zzzz Posted December 14, 2020 Share Posted December 14, 2020 Hi, I setup my first Unraid server a few days ago and am experiencing 70-80MB/s write speeds my cache drive (hardware listed below). I'm currently using Unraid 6.8.3 (trial). I created a usershare across all 4 of my harddrives and set "Use Cache" to "Yes", and I do see the data being written to the cache drive just at speeds significantly lower than I would have expected. I installed "Fix Common Problems" but don't see anything related to the cache drive or the main array. I also used DiskSpeed to benchmark the NVMe incase the adapter was the problem, however the reported speed was ~1300MB/s, which is around what I would expect. I also did try enabling "Disk Share" then writing directly to the cache drive, but I also saw the same slow speeds. Both the Unraid server along with the Windows 10 PC i'm writing data from are wired directly to my router using Cat 6A and everything has gigabit ports, so I don't think there's any problems there. Hardware: CPU: FX-8370 RAM: DDR3 8gb Motherboard: M5A99X EVO Hard drives: 4x WD120EMFZ (12TB Easystore Shucked) Cache: XPG SX8200 Pro 512GB (Attached using a PCIe x4 adapter card https://www.amazon.ca/gp/product/B01N09W21D/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1) Any advice is much appreciated! Quote Link to comment
Vr2Io Posted December 14, 2020 Share Posted December 14, 2020 1 hour ago, zzzz said: experiencing 70-80MB/s write speeds It is normal in 1G network, no mater how fast of storage device. Quote Link to comment
zzzz Posted December 14, 2020 Author Share Posted December 14, 2020 2 minutes ago, Vr2Io said: It is normal in 1G network, no mater how fast of storage device. Sorry if this is a dumb question, but why? Seems low for 1G, no? Quote Link to comment
Squid Posted December 14, 2020 Share Posted December 14, 2020 1 minute ago, zzzz said: Sorry if this is a dumb question, but why? Seems low for 1G, no? Maximum theoretical is 110MB/s. Once you take into consideration how parity works, then 70-80 is good. You can speed it up by enabling Turbo Write (Reconstruct Write Mode) at the expense that every drive has to be spinning (ala a typical RAID environment) Quote Link to comment
zzzz Posted December 14, 2020 Author Share Posted December 14, 2020 Just now, Squid said: Maximum theoretical is 110MB/s. Once you take into consideration how parity works, then 70-80 is good. You can speed it up by enabling Turbo Write (Reconstruct Write Mode) at the expense that every drive has to be spinning (ala a typical RAID environment) For the caching, I thought parity was only calculated when mover was kicked off? Quote Link to comment
Squid Posted December 14, 2020 Share Posted December 14, 2020 You are correct there. Post your diagnostics to see if there's anything else amiss Quote Link to comment
zzzz Posted December 15, 2020 Author Share Posted December 15, 2020 I've attached the diagnostic info. Just removed the HDD serial numbers. tower-diagnostics-20201214-1847.zip Quote Link to comment
JorgeB Posted December 15, 2020 Share Posted December 15, 2020 Also good idea to run a single stream iperf test to rule out a network issue. Quote Link to comment
dlandon Posted December 15, 2020 Share Posted December 15, 2020 You might want to take a look at this: Quote Link to comment
zzzz Posted December 15, 2020 Author Share Posted December 15, 2020 10 hours ago, JorgeB said: Also good idea to run a single stream iperf test to rule out a network issue. Great suggestion, I ran an iperf test and it seems that I'm only seeing 680Mbit/s, so it seems to be a network issue. Will spend some time figuring out why my router isn't running close to gigabit. Quote Link to comment
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