Hi everyone,
I have the same issue as in http://communities.vmware.com/thread/188141
I use ZFS to provide iSCSI LUN to Vmware ESXi 5.0.
However, the old SAN doesn't have iSCSI unmap. I have create / move / delete virtual machine between ZFS iSCSI. After a while, zpool list report 95% capacity used. However, Vmware shows VMFS only uses 50% capacity.
AFAIK, when creating a virtual machine, zvol allocated disk space.
However, when we moved / deleted virtual machine, zvol didn't update / didn't aware to update the free capacity.
Now, I believe due to the wrong free capacity reported in zpool list, the performance is deeply affected.
How I should do to let ZFS know the real free capacity.
I followed the trick in the post in iSCSI LUN from ESXi
dd if=/dev/zero of=testfile bs=1024k count=50000; sync;sleep 1;sync;rm -f testfile
However the trick is not working.
How I could let zfs know the true free capacity in VMFS? Zero-out VMFS?
Thanks million.
