I have recently installed Ubuntu 17.04 on a brand new Samsung SSD 850 Pro. It seems to work fine. However the read and write speeds are roughly half of advertised
$ sudo hdparm -tT /dev/sda /dev/sda: Timing cached reads: 9012 MB in 2.00 seconds = 4507.79 MB/sec Timing buffered disk reads: 808 MB in 3.01 seconds = 268.75 MB/sec
AHCI is enabled in BIOS and the system boots on UEFI.
The SSD has 6 partitions
$ sudo fdisk -l Disk /dev/sda: 238.5 GiB, 256060514304 bytes, 500118192 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: 8AAFFE6D-A829-46B5-B46F-ED4F7432F5B5 Device Start End Sectors Size Type /dev/sda1 2048 485375 483328 236M EFI System /dev/sda2 485376 39544831 39059456 18.6G Linux filesystem /dev/sda3 39544832 117671935 78127104 37.3G Linux filesystem /dev/sda4 117671936 133294079 15622144 7.5G Linux swap /dev/sda5 133294080 259123199 125829120 60G Linux filesystem /dev/sda6 259123200 468838399 209715200 100G Linux filesystem
Is there a problem in my setup? What might be the reason for lower than expected speeds? Any input is appreciated. Thanks in advance!
Forgot to mention that the SSD is mounted on a 2010 Dell Latitude E6410 which I have just learned that has a SATA II connector. It seems then, the speeds I am getting are reasonable.
Thanks everyone for their comments and answers!