2011/05/04

Disk speed

I don't know if this makes sense. In fact, I'm pretty sure it doesn't. Writing 10 GB to a WD Green 2.0TB drive in a NexStar CX USB 3.0 enclosure connected to an ASUS Z8NA-D6C.
# time dd if=/dev/zero of=/dev/sdc2 bs=1024k count=20480

20480+0 records in
20480+0 records out
21474836480 bytes (21 GB) copied, 704.374 seconds, 30.5 MB/s

real 11m44.375s
user 0m0.029s
sys 0m21.517s


Same operation on an ASUS M2N-MX SE with "only" 4 GB of RAM:
# time dd if=/dev/zero of=/dev/sdb2 bs=1024k count=20480

20480+0 records in
20480+0 records out
21474836480 bytes (21 GB) copied, 847.95 seconds, 25.3 MB/s

real 14m7.969s
user 0m0.335s
sys 7m17.540s
Mind you, Xorg is running also, so that takes up RAM and CPU.

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