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What are the memory and disk space requirements for a ZFS root installation?

April 26, 2017disk installation memory requirements ZFs

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What are the memory and disk space requirements for a ZFS root installation?

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The minimum amount of available pool space that is required for a bootable ZFS root file system is larger than for a bootable UFS root file system because swap and dump devices are not shared in a ZFS root environment. In addition, the swap and dump devices are sized at 1/2 the size of physical memory, but no more than 2 Gbytes and no less than 512 Mbytes (starting at build 96). The minimum amount of available pool space for a bootable ZFS root file system depends upon the amount of physical memory, the disk space available, and the number of BEs to be created. Approximately 1 Gbyte of memory and at least 32 Gbytes of disk space are recommended. For information about how the disk space is consumed and how to reduce the size of swap and dump devices before or after the installation of a bootable ZFS root file system, see the ZFS Admin Guide.