sda is a regular SATA disk and sdd is a USB attached SATA disk. Why isn't sdd
cached?
# dd if=/dev/sdd of=/dev/zero bs=1024k count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 3.00316 s, 34.9 MB/s
# dd if=/dev/sdd of=/dev/zero bs=1024k count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 2.98833 s, 35.1 MB/s
# dd if=/dev/sda of=/dev/zero bs=1024k count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.29493 s, 81.0 MB/s
# dd if=/dev/sda of=/dev/zero bs=1024k count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.0669201 s, 1.6 GB/s
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