We have server with hardware raid controller (Adaptec ASR71605Q). It has 10 sas HDD, 2 SSD for cache and 1gb onboard cache ram.
On server installed ESXi. On ESXi I'm start Linux, create 2Tb disk for tests. And now i need to test and ensure, that ssd-cache is really work. Adaptec utilities installed to ESXi (arcconf), but it's not clear is ssd-cache works or not.
I use fio to test iops with "direct=1" mode (that should work thru all caches directly with physical disks), and I get something around 1800 iops on 4k random writes with queue=32, that seems real 10 HDD speed.
Now i need perform some tests, that show, that ssd is work, but with all configuration I still get around 1800-2000 random iops. Which test on Linux can get me proof of ssd-caching?