bubbaQ Posted November 5, 2012 Share Posted November 5, 2012 Since I had some extra 256GB Samsung 830 SSDs on hand, I decided to test them in unRAID. With just one SSD as Disk 1, I could copy to it over the network at 121MB/sec from the RAMdisk on my workstation. So I set up Disk 1 and parity both on SSDs. Initial parity sync was 220MB/sec. A parity check ran a little slower, at about 190MB/sec. Copying to the parity-protected drive over the network was 83MB/sec. CPU load was about 35% for smbd. This is a dual-core AMD system, and the load was fairly evenly split among the 2 cores. Reading from the parity-protected disk1 was a bit faster... 91MB/sec. Now the odd part. When reading, CPU maxed out at 100% on ONE core... the other core was near idle. So I tried multiple simultaneous reads, and still, smbd was maxing out 1 core, and the other was near idle. I had read that smbd was single-threaded, and understand that is really necessary for some good reasons.... bit I never thought I'd max out a 3.2gHz CPU. System is a GA-MA790GP-UD4H with AMD Athlon II X2 260 Processor and 8GB or RAM. Quote Link to comment
PeterB Posted November 5, 2012 Share Posted November 5, 2012 I wonder whether this explains why some people are reporting dropouts when playing media files and initiating other disk activity Quote Link to comment
BLKMGK Posted November 5, 2012 Share Posted November 5, 2012 Disk IO halts on all disks while a sleeping disk spins up. That's the only thing I've ever had cause a dropout in media reads... Quote Link to comment
neilt0 Posted November 5, 2012 Share Posted November 5, 2012 I wonder whether this explains why some people are reporting dropouts when playing media files and initiating other disk activity There are no media files that are encoded at 90MB/sec. That's 720mbps. See my sig for a multiple Blu-ray streaming test. You should be able to stream at least 4 full Blu-ray discs simultaneously on a LOW END system. Quote Link to comment
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