disk vs volume caching
Posted: Tue May 01, 2012 9:33 am
I have 2 x 2Tb 7200 Caviar Black disks. With DISK caching enabled on each volume I get excellent performance, deferred writes work nicely and are writen to disk during the shutdown process.
I use this as a Hyper-V machine.
I decided to try the volume cache software instead with version 8 on the basis that instead of having to enable a cache on each disk, I just enable it for the volume. However performace was woeful. I ended up disabling it and running 0.8 at the disk level again. Performance returned.
I selected the same options except block size. The system is an ASUS KGPE-DX16 with dual 8 core AMD processors and 64Gb ram. So CPU load should not be an issue.
Anyway I have gone back to disk caching and all is working well.
I use this as a Hyper-V machine.
I decided to try the volume cache software instead with version 8 on the basis that instead of having to enable a cache on each disk, I just enable it for the volume. However performace was woeful. I ended up disabling it and running 0.8 at the disk level again. Performance returned.
I selected the same options except block size. The system is an ASUS KGPE-DX16 with dual 8 core AMD processors and 64Gb ram. So CPU load should not be an issue.
Anyway I have gone back to disk caching and all is working well.