>  use a bunch of 15K SAS drives as L2ARC cache for several TBs of SATA disks?

perhaps... depends on the workload, and if the working set
can live on the L2ARC

> used mainly as astronomical images repository

hmm, perhaps two trays of 1T SATA drives all
mirrors rather than raidz sets of one tray.

ie: pls don't discount how one arranges the vdev
in a given configuration.
                
                        Rob

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