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Hardware RAID with ZFS on Nexenta (OpenSolaris)

I am using Nexenta (Open Solaris) for its ZFS features on an Appliance that I use.  I was planning to set the disks as JBOD, but when I got down to it, the LSI MegaRaid SAS 8708EM2 controller did not support JBOD.  So, I had to set each of the 24 1Tb SATA disks as its own single disk RAID0 configuration.  This, at least, allowed the disks to be seen by the installation.  I mirrored the boot disks and used zpool not the Nexenta menu to create a 3 x 6disk raidz3 configuration with 3 hotspares.  The zpool will be used as an Iscsi target for remote VMware datastore.  Is this an efficient configuration or how could this have been done better with Nexenta.? Thank you for your help!
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ZFS is designed for JBOD controllers.  Without a JBOD controller then you will suffer big performance hits due to the mandatory flush-on-write.  RAID0 disks behind a MegaRAID controllers do not behave the same as true JBOD target devices.  There is still caching and some degree of virtualization.

I am sure you will have no problem having volunteers lined up if you want to swap a MegaRAID for a 92xx JBOD equivalent LSI.  IN fact, you may even get TWO LSI JBOD controllers for this MegaRAID.
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I am stuck with the hardware and looking need the free "open solaris" in a commercial environment.  How should I set this up for best performance?  If I use the hardware RAID10, how should I set up the zfs configuration?
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