Re: AHCI + LSI Logic = High disk latency (Windows 6.x guests
Well: A BIOS-upgrade plus ESXi upgrade to v4.1 did me no good.
- Except that power consumption of the server rose by 50%
Due to the new performance counters in ESXi 4.1 i did however discover that latency of the individual virtual disks was MUCH higher than overall physical disk latency - and that linux OS'es were affected by the problem as well.
In fact my SUSE based firewall (Astaro) had an average virtual disk write latency of 90ms!
(Which explained why the webGUI was so slow.)
I changed to buslogic controller, since paravirtual didn't work.
After that latency was down to single digit levels.
So for now I'm giving up LSI and sticking with paravirtual/buslogic.