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Update 2 - changing from ZFS directory to ZFS plugin / zvol made speeds better, but still curious why ZFS directory would be this slow?

Might be related: https://github.com/zfsonlinux/zfs/issues/5187

Hi All, I'm seeing very slow apt-get updates inside a Debian 8 KVM guest (iotop displays 100kb write but 99% io load / io wait), dd speed tests (yes I know it's not perfect) is also very slow: # dd if=/dev/zero of=test bs=64k count=1k oflag=dsync ^C15+0 records in 15+0 records out 983040 bytes...

So you are saying ext4 in the guest is the bottleneck? Do you recommend any other FS?

You probably need to set 'Shared'.

Yes I understand there are a myriad of other benchmarking tools available. However they were writing pretty much the same set of data, why would the results differ so much?

Hi all, I'm running ZFS on Proxmox 4.1 and for some reasons the I/O inside KVM guest is much slower than on host. The results are fairly consistent. Host: Guest: Storage configuration on host is the following The guest is running on raw (the only disk option available) with no cache...