Re: [zfs-discuss] VM's on ZFS - 7210

[Eff Norwood]

Saso is correct - ESX/i always uses F_SYNC for all writes and that is for sure 
your performance killer. Do a snoop | grep sync and you'll see the sync write 
calls from VMWare. We use DDRdrives in our production VMWare storage and they 
are excellent for solving this problem. Our cluster supports 50,000 users and 
we've had no issues at all. Do not use an SSD for the ZIL - as soon as it fills 
up you will be very unhappy.
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