On Tue, May 3, 2011 at 11:42 PM, Peter Jeremy < peter.jer...@alcatel-lucent.com> wrote:
> - Is the source pool heavily fragmented with lots of small files? > Peter, We've some servers holding Xen VMs and the setup was create to have a default VM from where others would be cloned so the space saving are quite good. The problem we've started seeing is that a zfs send -i is taking hours to send a very small amount of data (eg. 20GB in 6 hours) while a zfs send full transfer everything faster than the incremental (40-70MB/s). Sometimes we just give up on sending the incremental and send a full altogether. I'm wondering if it has to do with fragmentation too. Has anyone experience this? OpenSolaris b111. As a data point, we also have servers holding Vmware VMs (not cloned) and there is no problem. Anyone know what's special about Xen's cloned VMs? Sparse files maybe? Thanks, -- Giovanni Tirloni
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