Try isi_drivenum -A.  Last column should have HDD or SSD.  Example from a 7.1.1.4 Virtual Isilon:  Bay 1     Bank 0 (Front)    Port 0          Exp 0     PHY 0     Unit 0      Lnum 0     Active      Guid 03f296ca559cb22254b43334000dd2b9   WWN 0   Locn 0,0,0     VMware Virtual disk   FW:1.0        SN:                 exp 2000000     real 8203125     efs 5998592     /dev/da1   Tech SAS HDD
I have Isilon8 simulator installed and have HDD on my virtual machine. I tried to emulate SSD on this machine by editing  vm config as :  scsi0:8.virtualSSD = 1   the config was made OK, i reboot the VM and my settings are preserved,  Now, i want to check is SSD is in fact emulated or not.   usually for any linux machine, i would do : cat /sys/block/sda/queue/rotational   and based on the value it outputs, i could say if its HDD or SSD but i cannot use the same thing in OneFS.   Any help is appreciated.   Thanks,
How to check if drive is HDD or SSD