Only half of the drives available ZFS

Halfhidden

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May 14, 2021
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This is a pbs 3 install with an LSI SAS9211 with 6x 2tb sas hard drives hosted in a Dell Poweredge R710. PBS is installed on a USB pen and booted from that through BIOS (rather than UEFI)
After installation PBS can see all 7 drives. That is to say the 6 sas drives and the USB boot drive. However when I create a data pool for ZFS, only 3 drives are selectable... why?
 

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