June 29, 201610 yr What is the best way to test individual components of read/write performance? Such as individual drives, network, CPU speed etc? I'm still trying to hunt down why my write speeds are often below 30MB/sec with a cache drive. Read speeds seem sub-par as well.
June 29, 201610 yr Please post more detail about your current setup, what version of unraid, what disk drives, are you using SSD for cache, do you have gigabit ethernet etc... I noticed a massive jump as soon as I introduced SSD cache drive.
June 30, 201610 yr Author unRaid 6.1.9 plus 6 sata data drives, mix of WD green and the like Sad cache (64gb budget model. Msata drive in a pcie adapter) Gig ethernet
June 30, 201610 yr Have you configured your shares to use ssd cache? I would expect to see above 30MB/s with an SSD cache without it I think I was only getting around 45MB/s not sure if enabling jumbo frame rates on your router may help. There is a tips and tweaks page on wiki but not sure if it applies to version 6
June 30, 201610 yr Author Have you configured your shares to use ssd cache? I would expect to see above 30MB/s with an SSD cache without it I think I was only getting around 45MB/s not sure if enabling jumbo frame rates on your router may help. There is a tips and tweaks page on wiki but not sure if it applies to version 6 Yes they are definitely using the cache. I've been after this for a while so it shouldn't be setup related, which is why I want to test components.
June 30, 201610 yr Community Expert You can use this script I got from the forum to test the write speed of each disk. Unzip to flash root, usage: /boot/write_speed_test.sh /mnt/cache/test.dat Replace cache with diskX if you also want to test the array disks. It writes a 10GB test file, if you have lots of RAM you may need to increase the test file size for more accurate results. write_speed_test.zip
July 1, 201610 yr Author Thanks! So far my cache has given approximately 50MB/s Data disk 1 was around 20MB/s and data disk 2 is currently running at about 10 MB/s Sure seems slow!
July 1, 201610 yr Community Expert At least now you know where the problem is, smaller SSDs can have low write speed, check its specs, also make sure you're using the TRIM plugin, or it will become slow over time. Older disks are also much slower than newer ones, normal unRAID performance with gigabit and current hardware is gigabit speed writing to the cache SSD and between 45 and 60MB/s writing to the protected array.
July 1, 201610 yr Author At least now you know where the problem is, smaller SSDs can have low write speed, check its specs, also make sure you're using the TRIM plugin, or it will become slow over time. Older disks are also much slower than newer ones, normal unRAID performance with gigabit and current hardware is gigabit speed writing to the cache SSD and between 45 and 60MB/s writing to the protected array. Thanks for the tip on the TRIM plugin. I just installed it. I'm running a test right now on my only 4 TB HDD (the rest are older 2 TB drives) and it is significantly higher write speed, around 40MB/s.
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