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...*********************************************************************************************** cctest1$ df -lh Filesystem Size Used Avail Use% Mounted on /dev/sda1 1.5G 1.1G 306M 78% / tmpfs 62M 4.0K 62M 1% /dev/shm /dev/sda6 4.2G 3.6G 453M 89% /tmp /dev/sda5 938M 205M 685M 23% /var cctest1$ dmesg | grep DMA DMA zone: 101376 pages, LIFO batch:16 cctest1$ for i in `seq 1 10`; do hdparm -tT /dev/sda1; done Timing cached reads: 512 MB in 2.00 seconds = 256.00 MB/sec Timing buffered disk reads: 44 MB in 3.0...

...*********************************************************************************************** cctest1$ df -lh Filesystem Size Used Avail Use% Mounted on /dev/sda1 1.5G 1.1G 306M 78% / tmpfs 62M 4.0K 62M 1% /dev/shm /dev/sda6 4.2G 3.6G 453M 89% /tmp /dev/sda5 938M 205M 685M 23% /var cctest1$ dmesg | grep DMA DMA zone: 101376 pages, LIFO batch:16 cctest1$ for i in `seq 1 10`; do hdparm -tT /dev/sda1; done Timing cached reads: 512 MB in 2.00 seconds = 256.00 MB/sec Timing buffered disk reads: 44 MB in 3.0...

Currently I''m trying to figure out the best zfs layout for a thumper wrt. to read AND write performance. I did some simple mkfile 512G tests and found out, that per average ~ 500 MB/s seems to be the maximum on can reach (tried initial default setup, all 46 HDDs as R0, etc.). According to http://www.amd.com/us-en/assets/content_type/DownloadableAssets/ArchitectureWP_062806.pdf I would