Test 0

[AlexanderZvyagin]

I am pretty sure I did something wrong.... I got somehow worse performance after enabling the cache.

HDD Info

Model Family: Fujitsu MHZ BK
Device Model: FUJITSU MHZ2080BK G2
Serial Number: K85CT8A255YM
LU WWN Device Id: 5 00000e 042fa9a72
Firmware Version: 8A1F
User Capacity: 80,026,361,856 bytes [80.0 GB]
Sector Size: 512 bytes logical/physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: ATA8-ACS T13/1699-D revision 3f
SATA Version is: SATA 2.6, 3.0 Gb/s
Local Time is: Tue Aug 22 16:05:16 2017 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

SDD Info

Model Family: SandForce Driven SSDs
Device Model: SanDisk SDSSDX120GG25
Serial Number: 120947401598
LU WWN Device Id: 5 001b44 7349bdf7e
Firmware Version: R211
User Capacity: 120,034,123,776 bytes [120 GB]
Sector Size: 512 bytes logical/physical
Rotation Rate: Solid State Device
Device is: In smartctl database [for details use: -P show]
ATA Version is: ATA8-ACS, ACS-2 T13/2015-D revision 3
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Tue Aug 22 16:09:47 2017 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

File System on HDD

FS: btrfs, no cache

Label: none uuid: 7d2a05fc-6c1b-40e0-afd3-1aafb7bdfcf1
Total devices 1 FS bytes used 112.00KiB
devid 1 size 74.53GiB used 2.02GiB path /dev/sdi101

Benchmark test

Benchmark is done with gnome-disk-utility 3.24.1

HDD with BTRFS

read: 55.7 MB/s
write: 51.3 MB/s
access: 13.6 ms

SSD

read: 372.1 MB/s
write: 299.1 MB/s
access: 0.2 ms

HDD with BTRFS + cache on SSD

This is the final result

read: 24.8 MB/s
write: 54.4 MB/s
access: 18.26 ms

How the cache was created

sudo python2 CLI/eio_cli create -d /dev/sdi101 -s /dev/sdh2 -mwb -c CACHE