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How to add ZIL write and L2ARC read cache SSD devices in FreeNAS

ZFS is a file system and logical volume manager originally designed by Sun Microsystems. ZFS used by Solaris, FreeBSD, FreeNAS, Linux and other FOSS based projects. To improve performance of ZFS you can configure ZFS to use read and write caching devices. Usually SSD are used as effective caching devices on production Network-attached storage (NAS). How do I extend my existing zroot volume with ZIL and L2ARC ssd disks of FreNSA server?

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