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SoftRAID Volumes
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i have a Thunderbay enclosure, with 4 500MB SSD Drives, when i configure as a RAID 4 volume, i get write speeds of about 600MB/Sec AND read speeds of about 850 MB/sec. Configured in RAID 5, the write speeds are about 400MB, read speeds about 600MB/Sec. i am using an Imac, 13,1 connecting via Thunderbolt 1 port. i assumed the read/write speeds would be faster. the individual drives read and write about 350/300 when not configured for RAID. I've optimized for video files, the drives have no data yet, used Black Magic speed test to determine the speeds. what would be the most common bottleneck in performance?
Posted : 21/04/2017 10:41 am
You should get 800-900MB/s reads on a clean volume.
Depending on the computer will determine write speeds. (With RAID 4, expect to get 3X for reads, one disk has no "data".) A Mac Pro will have better write speeds than a Mac Mini, as SoftRAID is using the CPU to calculate parity as data is written.
RAID 4 will be faster on reads.
Posted : 21/04/2017 6:02 pm
Can you recommend a software utility to determine the read/write speeds? Specifically for USB and Thunderbolt exterior drives.
You should get 800-900MB/s reads on a clean volume.
Depending on the computer will determine write speeds. (With RAID 4, expect to get 3X for reads, one disk has no "data".) A Mac Pro will have better write speeds than a Mac Mini, as SoftRAID is using the CPU to calculate parity as data is written.
RAID 4 will be faster on reads.
Posted : 21/04/2017 6:55 pm
THere are several good ones:
BlackMagic Disk Speed Test is the simplest and free. Available on the App store, from BlackMagic. Just run it for a minute and you get numbers that are good enough for most purposes.
MacPerformance Guide has some advanced benchmarking utilities that can give you a breakdown of throughput against difference I/O Sizes if you are trying to troubleshoot your system.
Posted : 22/04/2017 1:04 pm
